CN112897458A - Assembling and fixing method of medium nano particles based on optical tweezers system - Google Patents
Assembling and fixing method of medium nano particles based on optical tweezers system Download PDFInfo
- Publication number
- CN112897458A CN112897458A CN202110072947.3A CN202110072947A CN112897458A CN 112897458 A CN112897458 A CN 112897458A CN 202110072947 A CN202110072947 A CN 202110072947A CN 112897458 A CN112897458 A CN 112897458A
- Authority
- CN
- China
- Prior art keywords
- medium
- optical tweezers
- transparent substrate
- particles
- medium nano
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002105 nanoparticle Substances 0.000 title claims abstract description 91
- 238000012576 optical tweezer Methods 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 39
- 239000000758 substrate Substances 0.000 claims abstract description 57
- 239000002086 nanomaterial Substances 0.000 claims abstract description 22
- 230000000694 effects Effects 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims description 24
- 239000011521 glass Substances 0.000 claims description 15
- 239000000725 suspension Substances 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 239000006059 cover glass Substances 0.000 claims description 10
- 239000008367 deionised water Substances 0.000 claims description 10
- 229910021641 deionized water Inorganic materials 0.000 claims description 10
- 239000002356 single layer Substances 0.000 claims description 7
- 238000003384 imaging method Methods 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 239000002096 quantum dot Substances 0.000 claims description 5
- 239000002390 adhesive tape Substances 0.000 claims description 4
- 238000010790 dilution Methods 0.000 claims description 4
- 239000012895 dilution Substances 0.000 claims description 4
- SDDGNMXIOGQCCH-UHFFFAOYSA-N 3-fluoro-n,n-dimethylaniline Chemical compound CN(C)C1=CC=CC(F)=C1 SDDGNMXIOGQCCH-UHFFFAOYSA-N 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 229910021389 graphene Inorganic materials 0.000 claims description 3
- 230000010355 oscillation Effects 0.000 claims description 3
- ITRNXVSDJBHYNJ-UHFFFAOYSA-N tungsten disulfide Chemical compound S=[W]=S ITRNXVSDJBHYNJ-UHFFFAOYSA-N 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 2
- 239000000853 adhesive Substances 0.000 claims description 2
- 230000001070 adhesive effect Effects 0.000 claims description 2
- 239000004065 semiconductor Substances 0.000 claims description 2
- 239000002245 particle Substances 0.000 abstract description 29
- 230000003287 optical effect Effects 0.000 abstract description 15
- 239000002131 composite material Substances 0.000 abstract description 10
- 230000008569 process Effects 0.000 abstract description 8
- 238000010276 construction Methods 0.000 abstract description 7
- 238000005516 engineering process Methods 0.000 abstract description 7
- 239000002609 medium Substances 0.000 description 54
- 238000001228 spectrum Methods 0.000 description 18
- 239000005543 nano-size silicon particle Substances 0.000 description 12
- 238000010586 diagram Methods 0.000 description 10
- 239000000243 solution Substances 0.000 description 6
- 238000007664 blowing Methods 0.000 description 5
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000012512 characterization method Methods 0.000 description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 239000013630 prepared media Substances 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000000975 dye Substances 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000005424 photoluminescence Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000000149 argon plasma sintering Methods 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000000539 dimer Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000011859 microparticle Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920000136 polysorbate Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 239000013638 trimer Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82B—NANOSTRUCTURES FORMED BY MANIPULATION OF INDIVIDUAL ATOMS, MOLECULES, OR LIMITED COLLECTIONS OF ATOMS OR MOLECULES AS DISCRETE UNITS; MANUFACTURE OR TREATMENT THEREOF
- B82B3/00—Manufacture or treatment of nanostructures by manipulation of individual atoms or molecules, or limited collections of atoms or molecules as discrete units
- B82B3/0061—Methods for manipulating nanostructures
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- Nanotechnology (AREA)
- Manufacturing & Machinery (AREA)
- Microscoopes, Condenser (AREA)
Abstract
本发明属于光学操纵技术领域，公开了一种基于光镊系统的介质纳米颗粒的组装与固定方法。本发明在传统光镊系统对微纳米尺度物体的可操控基础上，采取增加激光功率和物镜数值孔径的方法，实现对高折射率介质纳米颗粒的组装。通过优化激光功率以及激光势阱的位置，并利用介质纳米颗粒的光热效应，使介质纳米颗粒附着于衬底并可永久固定，也为更复杂而精确的复合纳米结构构建提供了方法。本发明克服了传统光镊技术难以操纵高折射率介质纳米颗粒以及难以将所操控颗粒固定这两个难题，组装工艺新颖，可控性及精确度高，成本低，适用范围广。此技术的运用将在新型复合纳米结构的构建以及相关纳米光子学效应研究中发挥重要的作用。
The invention belongs to the technical field of optical manipulation, and discloses a method for assembling and fixing medium nanoparticles based on an optical tweezers system. On the basis of the controllability of the traditional optical tweezers system to the micro-nano-scale objects, the invention adopts the method of increasing the laser power and the numerical aperture of the objective lens to realize the assembly of the high-refractive-index medium nanoparticles. By optimizing the laser power and the position of the laser potential well, and using the photothermal effect of the dielectric nanoparticles, the dielectric nanoparticles can be attached to the substrate and can be permanently fixed, which also provides a method for the construction of more complex and precise composite nanostructures. The invention overcomes the two problems that the traditional optical tweezers technology is difficult to manipulate the high-refractive-index medium nanoparticles and that the manipulated particles are difficult to fix. The invention has novel assembly process, high controllability and precision, low cost and wide application range. The application of this technology will play an important role in the construction of new composite nanostructures and the study of related nanophotonic effects.
Description
Technical Field
The invention belongs to the technical field of optical manipulation, and particularly relates to an assembling and fixing method of medium nano particles based on an optical tweezers system.
Background
The current methods for constructing nanostructure systems generally have two types, namely a "top-down" method and a "bottom-up" method. The "top-down" method is a method of etching a relatively large-sized substance by various physicochemical means to construct a nanostructure system, and is quite sophisticated, but has a complicated process and is expensive. The "bottom-up" method is a method in which small structural units are self-assembled into a relatively large and complex structural system through weak interaction, and the method currently has some problems, such as difficult precise control, narrow application range, inability of large-area application, and the like. Although the nanoparticle assembly method based on the optical tweezers system can solve the above problems to a certain extent, the existing optical tweezers manipulation technology still has certain difficulty in assembling high-refractive-index dielectric nanoparticles. More importantly, how to fix the assembled particles in a liquid environment onto a substrate and combine with a specific nanostructure material remains a key problem to be solved urgently.
If the optical tweezers system can be used for accurately controlling the medium nano particles to be adhered to a specific structure, the success rate of the bottom-up nano structure construction can be greatly improved. Therefore, the method has important significance in realizing the assembly and fixation of the medium nano particles by using the optical tweezers system.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art described above. Therefore, the invention provides a method for assembling and fixing medium nano particles based on an optical tweezers system.
On the basis that the traditional optical tweezers system can control the micro-nano object, the invention adopts the method of increasing the laser power and the numerical aperture of the objective lens to realize the assembly of the high-refractive-index medium nano particles. By optimizing the laser power and the position of a laser potential well and utilizing the photothermal effect of the medium nano-particles, the medium nano-particles are attached to the substrate and can be permanently fixed. The invention also provides a method for constructing more complex and accurate composite nano structures, such as precisely controlling the combination of medium nano particles and nano structure materials, two-dimensional materials and the like on a substrate.
The invention overcomes the two problems that the traditional optical tweezers technology is difficult to control the high-refractive-index dielectric nano particles and to fix the controlled particles, and has the advantages of novel assembly process, high controllability and accuracy, low cost and wide application range. The application of the technology can play an important role in the construction of novel composite nano structures and the research of related nano photonic effects.
In order to achieve the above object, the present invention provides a method for assembling and fixing dielectric nanoparticles based on an optical tweezers system, comprising the following steps:
(1) preparing medium nano particles into a medium nano particle suspension, sucking the medium nano particle suspension liquid to be dropped on a transparent substrate, and covering a cover glass to obtain a sample to be processed;
(2) inversely buckling the sample to be processed on a sample table of the optical tweezers system in a manner that a cover glass is arranged below and a transparent substrate is arranged above;
(3) adjusting the focal length to enable imaging to be clear, and adjusting the sample stage to find the position of the medium nano-particles needing to be assembled;
(4) opening the laser and adjusting the potential well, and moving the potential well to capture the medium nano particles;
(5) adjusting the focal length to enable the focal plane of the optical tweezers beam to be positioned on the surface of the transparent substrate, adjusting the power and the position of the potential well, dragging the medium nano particles to be close to the substrate, and increasing the adhesive force between the medium nano particles and the transparent substrate through the photo-thermal effect generated by the medium nano particles under laser to realize the permanent assembly and fixation of the medium nano particles; at the moment, the laser wavelength of the optical tweezers system is a near infrared band, the laser power is not less than 5W, and the numerical aperture of the objective lens is not less than 1.
After the sample to be processed is reversely buckled on the sample table of the optical tweezers system in the step (2), the lens of the optical tweezers system needs to be changed into a dark field lens and an objective lens with a proper multiple is selected, the optical paths of the system are adjusted to enable the lens to be positioned on the same straight line, and the system is started up in sequence after the adjustment is finished;
and (4) in the step (3), the illuminating lamp of the optical tweezers system is required to be turned on and adjusted to proper brightness, the position of the sample stage in the horizontal direction is adjusted to enable the sample to be processed to be positioned right above the lens, observation is carried out through the ocular lens, the focal length is adjusted to enable imaging to be clear, and then the position of the sample stage is adjusted to find the position of the medium nanoparticles required to be assembled.
After the assembly and the adhesion fixation of all the medium nano particles are finished, the sample is carefully taken out, the cover glass is removed, meanwhile, the excessive solution on the surface of the transparent substrate is blown off by using an ear blowing ball, and the transparent substrate is placed in a dry and dust-free environment for storage for later optical characterization after the treatment is finished.
The prepared sample is placed under an optical microscope, the approximate appearance of the sample is determined by a bright field and a dark field, the scattering spectrum of the assembled medium nano particles is measured by a dark field light scattering spectrum detection device, and the experimental scattering spectrum is simulated and reproduced by FDTD (finite difference time domain) so as to know the nature of the optical resonance mode of the different medium nano particles and judge the size and the aggregation form of the assembled medium nano particles.
Preferably, the dielectric nanoparticles in step (1) are made of a high refractive index semiconductor material, and are selected from at least one of Si, Ge, Se or Te, and the diameter of the dielectric nanoparticles is 100-200 nm. The dielectric nanoparticles are characterized by high refractive index and strong optical response.
Preferably, the preparation method of the medium nanoparticle suspension in the step (1) comprises the following steps: and adding deionized water into the medium nano particles for dilution, and then carrying out ultrasonic oscillation to prepare a medium nano particle suspension. The purpose of ultrasonic oscillation is to dilute the particles more thoroughly and uniformly, and meanwhile, the concentration of the particles in the medium nano particle suspension is appropriate, so that the subsequent optical tweezers potential well can accurately capture and control the particles.
Preferably, the upper and lower edges of the transparent substrate in step (1) are adhered with double-sided adhesive tapes with the same thickness. The operation can form a layer of gap between the conductive glass and the cover glass, and the medium nano-particle suspension dropped in the gap has larger operation space under the optical tweezers, thereby facilitating the operation and control of the optical tweezers. And (3) sucking a small amount of prepared medium nanoparticle solution on a transparent substrate adhered with double-sided adhesive tape by using a disposable rubber head dropper, dripping 2-3 drops of the prepared medium nanoparticle solution into the middle of the substrate, and carefully covering a cover glass to prevent bubbles from being generated.
Preferably, the transparent substrate in step (1) is selected from quartz glass, conductive glass or a flexible transparent substrate.
Before use, the transparent substrate needs to be cleaned, and the method comprises the following specific steps: sequentially putting the transparent substrate into acetone, absolute ethyl alcohol and deionized water, and respectively cleaning for 15min by adopting an ultrasonic oscillator; and taking out the cleaned transparent substrate, blowing off excessive water on the surface by using an ear blowing ball, drying on a heating plate, cutting the transparent substrate into small pieces with proper sizes, and putting the small pieces into a sample box for independent storage.
More preferably, the transparent substrate in step (1) is conductive glass. The conductive glass has the advantage of conductivity, and is more convenient for subsequent characterization of Scanning Electron Microscope (SEM) morphology.
Preferably, the transparent substrate in the step (1) can be also transferred with two-dimensional materials and/or nano-structured materials at the previous stage; the two-dimensional material is selected from at least one of graphene, single-layer tungsten sulfide or single-layer tungsten selenide; the nano-structure material is selected from at least one of a super-surface array structure, a nano antenna, a nano luminescent quantum dot or a luminescent dye.
The nano-structure material, the two-dimensional material and the like are transferred on the transparent substrate in advance, and then the composite construction of the medium nano-particles and other materials can be realized through the assembly and the fixation of the optical tweezers, so that the application range of the medium nano-particles and other materials is expanded.
In step (5), the laser power of the optical tweezers system still needs to be adjusted according to the properties of the specific assembly structure. For example, if the conductive glass is used as a transparent substrate, it is necessary to ensure that the laser applied to the surface of the conductive glass coating will not damage the original film structure of the conductive glass due to excessive heat generation; the structure of luminescent quantum dots, two-dimensional materials and the like is prevented from being damaged by excessive power, so that the construction of the composite nano structure is influenced.
Preferably, the state of the sample to be treated is occasionally observed in the step (5), and deionized water is replenished thereto when the moisture is reduced. In this operation, the purpose of timely replenishment of deionized water is to avoid the effect of liquid surface tension on the composite structure resulting from evaporation of the solution.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention utilizes the optical tweezers system to capture, assemble and fix the medium nano particles, has great advantages in controllability and stability, and shortens the experimental period required by uncertainty.
(2) The optical tweezers are assembled in the liquid environment of pure water, do not need to introduce chemical reagents or modifying groups (such as surfactants, surface modifying groups and the like), are simple and quick, and do not damage the physical properties of materials and structures.
(3) The assembling and fixing method has wide application range, can be used for various medium nano particles (such as Si, Ge, Se, Te and the like), and is also suitable for various sizes and various types of transparent substrates.
(4) The invention focuses on the limitation of the traditional optical tweezers to control, mainly overcomes the control problem of the nano particles with the characteristics of high refractive index and opacity and the fixation problem after the nano particles are captured, can construct a specific composite nano structure at a specific position and perform characterization, obtains more abundant experimental data, and creates conditions for subsequent optical application.
Drawings
FIG. 1 is a schematic view of an optical tweezers-assisted assembly process;
FIG. 2 is a working schematic diagram of the optical tweezers;
FIG. 3 is a schematic diagram of the assembly and fixation of the dielectric nanoparticles;
FIG. 4 is an optical diagram of a sample adhered product;
FIG. 5 is a diagram of a detection apparatus for measuring dark field scattering spectra;
FIG. 6 is a graph of measured media Si nanoparticle clusters;
FIG. 7 is a scattering spectrum corresponding to Si nanoparticles;
FIG. 8 is Si nanoparticle size and assembly morphology determination based on single particle dark field scattering spectroscopy;
Detailed Description
In order to make the technical solutions of the present invention more apparent to those skilled in the art, the following examples are given for illustration. It should be noted that the following examples are only preferred embodiments of the present invention, and the claimed protection scope is not limited thereto, and any modification, substitution, combination made without departing from the spirit and principle of the present invention are included in the protection scope of the present invention.
The starting materials, reagents or apparatuses used in the following examples are conventionally commercially available or can be obtained by conventionally known methods, unless otherwise specified.
The medium nano-particle assembly technology based on the optical tweezers system comprises the optical tweezers system, a transparent substrate and a medium nano-particle suspension. Optical tweezers are used for capturing the medium nano particles and accurately controlling the medium nano particles to be fixed on the substrate or a specific nano structure on the substrate, medium nano particle clusters with different shapes and different numbers are assembled by controlling the number of the captured particles, the difference of optical resonance modes of the medium nano particle clusters is researched, and the assembled shapes of the medium nano particle clusters are determined by spectra. The specific situation is as follows:
example 1
This example describes a specific process of preparing a particle assembly using an optical tweezers system, which includes the following steps:
1. sequentially putting a transparent substrate to be used into acetone, absolute ethyl alcohol and deionized water, and respectively cleaning for 15min by adopting an ultrasonic oscillator; taking out the cleaned transparent substrate, blowing off excessive moisture on the surface by using an ear blowing ball, drying on a heating plate, cutting the transparent substrate into small pieces with proper sizes, and putting the small pieces into a sample box for independent storage;
the upper and lower edges of the transparent substrate can be adhered with double-sided adhesive tape with the same thickness. The operation can form a layer of gap between the conductive glass and the cover glass, and the medium nano-particle suspension dropped in the gap has larger operation space under the optical tweezers, thereby facilitating the operation and control of the optical tweezers.
And adding deionized water into the medium nano particles for dilution, and then oscillating the medium nano particles in an ultrasonic oscillator for 10min so as to dilute the particles more thoroughly and uniformly and prepare a medium nano particle suspension. Sucking a small amount of the prepared medium nano-particle suspension by using a disposable rubber head dropper, dripping 2-3 drops of the medium nano-particle suspension on the surface of a cleaned transparent substrate, and covering a cover glass to prepare a sample to be treated; a sample to be processed is reversely buckled on a sample table of the optical tweezers system in a mode that a cover glass is arranged below and a transparent substrate is arranged above;
2. starting the optical tweezers system, preheating the laser of the optical tweezers system for 5 minutes, replacing the lens of the optical tweezers with a dark field lens, selecting an objective lens with a proper multiple, adjusting the dark field lens, the sample and the objective lens to be positioned on the same straight line, and simultaneously checking and adjusting the setting of each position of the optical tweezers system. The concentration of the medium nano particles is not too high or too low during dilution, and too high can cause that a great amount of particles are captured during the capture of a potential well, so that clusters with too many particles are formed, and the subsequent research is not facilitated. Too low will result in difficulty in capture, taking too long; since the diameter distribution of the medium nano-particles is 100-200nm, the medium nano-particles are hardly visible under the conventional bright field, and therefore, a dark field must be adjusted before the experiment.
Fig. 1 is a schematic diagram of a process of capturing and adhering the dielectric nanoparticles, in which optical tweezers capture the dielectric nanoparticles through a potential well formed by a gaussian beam emitted by laser, and the particles are moved to a target position and adhered by moving the potential well in a Z direction, wherein a transparent substrate is conductive glass. Fig. 2 is a schematic diagram of a working optical path of the optical tweezers, and the laser is capturing light to capture and control micro particles. While the white light source is the illumination and imaging light source.
Example 2
In this embodiment, the high refractive medium nanoparticles are mainly captured by creating a potential well and fixed on the substrate by using a photo-thermal effect, and fig. 3 is a schematic diagram of assembling and fixing the medium nanoparticles, which specifically includes the following steps:
(1) and turning on an illumination light source to proper brightness, observing whether a sample to be processed can be seen through an eyepiece by using a coarse focusing distance, positioning a seen picture to the surface of the substrate by fine tuning a focal distance after the sample to be processed is seen, and then adjusting the XY direction of the sample table by using a control lever to find the position and the structure of the particles to be assembled. And opening the software at the computer end of the optical tweezers system to present an imaging picture on a computer screen, adjusting the frame number, the exposure time and the like of the camera to ensure that the imaging effect is the best, and finely adjusting the focal length to ensure that the picture on the computer is the clearest.
(2) And starting laser to create a potential well, controlling the position, the switch and the power of the potential well through a mouse, moving the potential well to the position where the particles need to be captured, and continuously adjusting the power and the position of the potential well relative to the Z axis of the particles until the particles are completely captured according to the state of the particles around the potential well. After the capture is completed, the particles are moved to the position needing to be adhered, the focal distance is adjusted to enable the particles to be positioned on the surface of the substrate, and the power is adjusted to enable the particles to be adhered to the substrate or a specific structure due to the heat effect. This step is repeated multiple times to assemble more particles.
The model of the optical tweezers system used in the experiment is tween 250si, the laser power is 5W, the laser wavelength is 1064nm, the numerical aperture of the objective lens is 1, and the switching rate of the optical traps is 100 KHz. The higher laser power and the numerical aperture of the objective lens provide the capability of controlling the high-refractive-index medium nano particles. The van der waals adhesion force between the nanoparticles and the substrate is increased by the thermal effect generated by the high refractive index nanoparticles under laser irradiation.
The laser power still needs to be adjusted according to the properties of the specific assembly structure, for example, if the conductive glass is used as the transparent substrate, it is necessary to ensure that the laser applied to the surface of the conductive glass coating will not damage the original film structure of the conductive glass due to excessive heat generation. If two-dimensional materials (such as graphene, single-layer tungsten sulfide, single-layer tungsten selenide and the like) and/or nano-structure materials (such as a super-surface array structure, a nano antenna, nano luminescent quantum dots, luminescent dyes and the like) are transferred on the transparent substrate at the earlier stage, the structures of the luminescent quantum dots, the two-dimensional materials and the like are prevented from being damaged by excessive power, and the construction of a composite nano structure is further influenced.
Meanwhile, the state of the sample to be treated is observed at variable times, and when the moisture content is reduced, deionized water is added. In this operation, the purpose of timely replenishment of deionized water is to avoid the effect of liquid surface tension on the composite structure resulting from evaporation of the solution.
FIG. 4 shows Si nanoparticle arrays assembled by optical tweezers system and fixed on conductive glass and fixed on single layer WS2And dark field, bright field optical maps of Si nanoparticles on thin hBN. Si is most typically used as dielectric nanoparticles to be assembled on a conductive glass substrate, and it is understood that other dielectric particles are also suitable. While Si nanoparticles are assembled on WS2In the aspect of/hBN, the enhancement and the regulation of Si nanoparticles on photoluminescence of two-dimensional materials are researched, and the enhancement and the regulation on photoluminescence of the two-dimensional materials are also completed by other medium nanoparticlesDifferent substrates or different nanostructures on the substrates which are experimentally researched can be applied to the optical tweezers assembly technology. Meanwhile, the dark field optical diagram of the assembly process of the dielectric particles in the aqueous solution under the optical tweezers is also shown, and the small bright spots in the diagram are the adhered dielectric particles.
Example 3
In the embodiment, a single particle dark field spectrum testing system is mainly used for measuring the dark field scattering spectrum of Si nanoparticles fixed on a substrate nano structure, and FDTD (finite time difference method) is used for simulating the scattering spectrum of Si nanoparticles with different sizes and structures to reproduce experimental spectra, analyzing the optical mode of the experimental spectra, and determining the structure and the size of a measured medium Si nanoparticle cluster.
FIG. 5 is a diagram of a detection apparatus for measuring dark field scattering spectra, by which particles assembled on a substrate nanostructure can be measured; firstly, Si nanoparticle clusters on a sample are selected, wherein 1, 2, 3 and 4 in the figure 6 all represent the Si nanoparticle clusters; the corresponding dark field scattering spectrum is measured by the spectrometer, and the test result is shown in fig. 7. By analyzing the resulting spectra, it can be roughly determined that the measured clusters consist of single particles or oligomers. As shown in fig. 8, FDTD is used to simulate scattering spectra of Si single particles, dimers and trimers between 100-200nm, and it is known that the scattering spectra are contributed from the magnetic dipole resonance mode, the electric dipole resonance mode and the coupling resonance mode, which vary with the size, and the size and structure of the measured clusters can be obtained by comparing the measured spectra with the simulated spectra.
The invention uses the optical tweezers system to assist in assembling the medium nano particles, so that the medium nano particles can be manually assembled at a specific position accurately in a controllable manner, nano particle clusters of different materials and different forms can be assembled on different substrates, and the assembling process does not need to introduce chemical reagents or modifying groups, thereby having great significance for researching and exploring the characteristics of novel materials.
Claims (7)
1. A method for assembling and fixing medium nano particles based on an optical tweezers system is characterized by comprising the following steps:
(1) preparing medium nano particles into a medium nano particle suspension, sucking the medium nano particle suspension liquid to be dropped on a transparent substrate, and covering a cover glass to obtain a sample to be processed;
(2) inversely buckling the sample to be processed on a sample table of the optical tweezers system in a manner that a cover glass is arranged below and a transparent substrate is arranged above;
(3) adjusting the focal length to enable imaging to be clear, and adjusting the sample stage to find the position of the medium nano-particles needing to be assembled;
(4) opening the laser and adjusting the potential well, and moving the potential well to capture the medium nano particles;
(5) adjusting the focal length to enable the focal plane of the optical tweezers beam to be positioned on the surface of the transparent substrate, adjusting the power and the position of the potential well, dragging the medium nano particles to be close to the substrate, and increasing the adhesive force between the medium nano particles and the transparent substrate through the photo-thermal effect generated by the medium nano particles under laser to realize the permanent assembly and fixation of the medium nano particles; at the moment, the laser wavelength of the optical tweezers system is a near infrared band, the laser power is not less than 5W, and the numerical aperture of the objective lens is not less than 1.
2. The assembling and fixing method according to claim 1, wherein the dielectric nanoparticles in step (1) are high refractive index semiconductor materials selected from at least one of Si, Ge, Se or Te, and have a diameter of 100-200 nm.
3. The assembling and fixing method according to claim 1, wherein the medium nanoparticle suspension in step (1) is prepared by: and adding deionized water into the medium nano particles for dilution, and then carrying out ultrasonic oscillation to prepare a medium nano particle suspension.
4. The assembling and fixing method according to claim 1, wherein the upper and lower edges of the transparent substrate in step (1) are adhered with double-sided adhesive tapes of the same thickness.
5. The assembling and fixing method according to claim 1, wherein the transparent substrate in step (1) is selected from quartz glass, conductive glass, or a flexible transparent substrate.
6. The assembly and fixation method according to claim 1, wherein the transparent substrate in step (1) is further pre-transferred with two-dimensional material and/or nano-structured material; the two-dimensional material is selected from at least one of graphene, single-layer tungsten sulfide or single-layer tungsten selenide; the nano-structure material is selected from at least one of a super-surface array structure, a nano antenna, a nano luminescent quantum dot or a luminescent dye.
7. The assembling and fixing method according to claim 1, wherein the state of the sample to be treated is observed occasionally in the step (5), and deionized water is replenished thereto when the moisture is reduced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110072947.3A CN112897458A (en) | 2021-01-20 | 2021-01-20 | Assembling and fixing method of medium nano particles based on optical tweezers system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110072947.3A CN112897458A (en) | 2021-01-20 | 2021-01-20 | Assembling and fixing method of medium nano particles based on optical tweezers system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112897458A true CN112897458A (en) | 2021-06-04 |
Family
ID=76116317
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110072947.3A Pending CN112897458A (en) | 2021-01-20 | 2021-01-20 | Assembling and fixing method of medium nano particles based on optical tweezers system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112897458A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113777675A (en) * | 2021-09-07 | 2021-12-10 | 南开大学 | Method for preparing super surface by laser-induced nanosphere aggregation arrangement |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040105158A1 (en) * | 1998-02-03 | 2004-06-03 | Arch Development Corporation | Apparatus for applying optical gradient forces |
| US20050122550A1 (en) * | 2003-10-28 | 2005-06-09 | Joseph Plewa | System and method for manipulating and processing materials using holographic optical trapping |
| US20060291019A1 (en) * | 2005-06-24 | 2006-12-28 | Grier David G | System and method for holographic optic trap bonding |
| CN101378985A (en) * | 2005-01-12 | 2009-03-04 | 纽约大学 | System and method for processing nanowires with holographic optical tweezers |
-
2021
- 2021-01-20 CN CN202110072947.3A patent/CN112897458A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040105158A1 (en) * | 1998-02-03 | 2004-06-03 | Arch Development Corporation | Apparatus for applying optical gradient forces |
| US20050122550A1 (en) * | 2003-10-28 | 2005-06-09 | Joseph Plewa | System and method for manipulating and processing materials using holographic optical trapping |
| CN101378985A (en) * | 2005-01-12 | 2009-03-04 | 纽约大学 | System and method for processing nanowires with holographic optical tweezers |
| US20060291019A1 (en) * | 2005-06-24 | 2006-12-28 | Grier David G | System and method for holographic optic trap bonding |
Non-Patent Citations (3)
| Title |
|---|
| A.ASHKIN: "Forces of a single-beam gradient laser trap on a dielectric sphere in the ray optics regime", 《BIOPHYSICAL JOURNAL》 * |
| MATTHEW J. CRANE等: "Optically oriented attachment of nanoscale metal-semiconductor heterostructures in organic solvents via photonic nanosoldering", 《NATURE COMMUNICATIONS》 * |
| 朱晨俊，宋五洲，屈铭等: "硅基纳米光镊结构的热分析和捕获特性", 《光学学报》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113777675A (en) * | 2021-09-07 | 2021-12-10 | 南开大学 | Method for preparing super surface by laser-induced nanosphere aggregation arrangement |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102565057B (en) | Metamaterial-based optical tweezers | |
| WO2017079882A1 (en) | Optical fibre with end face having metal micro-nano structure, and preparation method and application method therefor | |
| CN101788571A (en) | Nanomanipulation method for compounding laser near-field optical tweezers and AFM probe | |
| CN107589278A (en) | Reflective polarization modulation near-field scanning optical microscope system based on optical fiber probe | |
| CN111830614A (en) | A solution for nanograting imprinting using laser polarization state | |
| WO2024054949A1 (en) | Sensors using liquid metal-based nanophotonic structures | |
| CN112897458A (en) | Assembling and fixing method of medium nano particles based on optical tweezers system | |
| CN110057751B (en) | Apparatus and method for making optical particle probes | |
| JP2009115533A (en) | Method for manufacturing colloid probe cantilever for atomic force microscope and its manufacturing device | |
| Khan et al. | Parallel near-field optical micro/nanopatterning on curved surfaces by transported micro-particle lens arrays | |
| CN101975976B (en) | Photonic crystal micro-nano structure direct-writing method based on metal nanoparticles | |
| CN111999786A (en) | Hemispherical lens with opaque film covering spherical center and preparation method thereof | |
| CN112834786B (en) | Three-dimensional manipulation of nanoparticles based on scanning probes | |
| Piccotti et al. | Polarized coherent emission outside high-symmetry points of dye-coupled plasmonic lattices | |
| CN109734048B (en) | A kind of processing method of near-infrared photoelectric device | |
| Wei et al. | Single-molecule-doped crystalline nanosheets for delicate photophysics studies and directional single-photon-emitting devices | |
| CN109665490B (en) | Nano connecting device and nano wire connecting method | |
| Gong et al. | High-brightness plasmon-enhanced nanostructured gold photoemitter | |
| Therien et al. | Three-color plasmon-mediated reduction of diazonium salts over metasurfaces | |
| Couto et al. | Direct femtosecond laser printing of silk fibroin periodic structure with lower mid-infrared reflectivity | |
| CN111710590A (en) | A method to improve the polarization degree of perovskite quantum dot films | |
| RU2784212C1 (en) | Method for forming quantum dots based on the effect of higher-order mie super-resonant modes | |
| CN209418975U (en) | A near-field light generating device | |
| Song | Surface plasmon propagation in metal nanowires | |
| CN117550548A (en) | Optical fiber SERS probe based on gold nanoparticle array and preparation method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210604 |