CN113504184B - Adjustable and controllable medium chiral nanometer enhancement device and system - Google Patents

Abstract

The present application relates to controllable medium chiral nano-enhancing devices and systems, and in particular, to the field of chiral devices. The present application provides a tunable dielectric chiral nano-enhancing device, the device includes: a substrate, a dielectric layer, a disulfide layer and a composite structure layer; the optical signal generates guided mode resonance in the composite structure layer and the dielectric layer, and the optical signal generates a guided mode resonance in the metal layer. The upper surface generates surface plasmon resonance, which in turn increases the heat loss and surface current of the disulfide layer, thereby enhancing the optical chirality of the composite structural layer, and finally achieving the purpose of enhancing chirality; The materials of the second nanorods, the third nanorods, the fourth nanorods and the fifth nanorods are phase change materials, and the temperature change makes the conductance of the second nanorods, the third nanorods, the fourth nanorods and the fifth nanorods The change of the rate, thereby causing the change of the refractive index of the device of the present application, that is, the present application can realize the dynamic regulation of the CD signal by changing the temperature.

Description

Tunable dielectric chiral nano-enhanced devices and systems

technical field

The present application relates to the field of chiral devices, in particular, to a controllable medium chiral nano-enhancing device and system.

Background technique

Chirality refers to the geometrical property of a structure that its mirror image cannot be superimposed by a simple rotation or translation. Chirality occurs widely in nature, such as DNA and proteins. Circular dichroism refers to the difference in absorption or transmission of left-circularly polarized light (LCP) and right-circularly polarized (RCP) light caused by the difference in the imaginary part of the refractive index of chiral materials. In recent years, artificial chiral nanostructures have been widely studied due to their optical properties that cannot be exhibited by natural chiral materials, such as circular dichroism (CD), asymmetric transmission effect (AT), negative refractive index, etc. CD spectroscopy has been used for chiral sensing, selective thermal radiation, chiral imaging, etc.

In the prior art, researchers have explored metal-based localized surface plasmon polaritons (LSPs) and surface plasmon polaritons (SPPs) for chirality-enhanced nanostructures. For chiral metal nanosystems, hybrid surface plasmons can be generated by adding graphene to enhance the CD signal, and the CD signal can be actively regulated by adjusting the Fermi level and voltage control of graphene. However, the optical loss of chiral metal nanosystems is strong, and surface plasmons of graphene exist in the terahertz and mid-to-far-infrared frequency range.

The chiral medium structure in the prior art has weak enhancement of circular dichroism in the visible light band, and cannot dynamically control the CD signal.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a controllable medium chiral nano-enhancing device and system in view of the above-mentioned deficiencies in the prior art, so as to solve the problem of making the chiral medium structure in the prior art in the visible light band. The enhancement of circular dichroism is weak, and the CD signal cannot be dynamically regulated.

To achieve the above purpose, the technical solutions adopted in the embodiments of the present invention are as follows:

In a first aspect, the present application provides a controllable dielectric chiral nano-enhancing device. The device includes: a substrate, a dielectric layer, a disulfide layer and a composite structure layer; the dielectric layer is arranged on one side of the substrate, and the disulfide layer is arranged on one side. On the side of the dielectric layer away from the substrate, the composite structure layer is disposed on the side of the disulfide layer away from the substrate, the composite structure layer includes a plurality of nanostructure parts, and each nanostructure part includes a first nanorod and a second nanorod , the third nanorod, the fourth nanorod and the fifth nanorod, the second nanorod, the third nanorod, the fourth nanorod and the fifth nanorod are all inclined on the sidewall of the first nanorod, and the third The material of at least one of the second nanorod, the third nanorod, the fourth nanorod and the fifth nanorod is a phase change material.

Optionally, an axial length of the nanostructure portion parallel to the first nanorod is 460 nm-500 nm, and an axial length of the nanostructure portion perpendicular to the first nanorod is 460 nm-480 nm.

Optionally, the distance between the same point of the second nanorod and the third nanorod is 140nm-190nm.

Optionally, the distance between the same point of the fourth nanorod and the fifth nanorod is 140nm-190nm.

Optionally, the length of the second nanorod is not equal to the length of the third nanorod, and the length of the fourth nanorod is not equal to the length of the fifth nanorod.

Optionally, the included angles of the second nanorod, the third nanorod, the fourth nanorod and the fifth nanorod and the sidewall of the first nanorod are all 45 degrees.

Optionally, the material of the disulfide layer is MoS ₂ and/or WS ₂ .

Optionally, the material of the substrate is gold and/or silver.

Optionally, the material of the first nanorod is a high refractive index material.

In a second aspect, the present application provides a controllable medium chiral nano-enhancing system, the system comprising: a temperature control device, a chiral molecular solution, a spectrometer and the adjustable medium chiral nano-enhancing device of any one of the first aspect, The temperature control device is arranged outside the composite structure layer of the device to change the temperature of the composite structure layer, the molecular solution is filled in the gap of the composite structure layer, and the spectrometer is used to detect the spectrum of the emitted light of the device.

The beneficial effects of the present invention are:

The present application provides a controllable dielectric chiral nano-enhancing device, the device includes: a substrate, a dielectric layer, a disulfide layer and a composite structure layer; the dielectric layer is disposed on one side of the substrate, and the disulfide layer is disposed on the side of the dielectric layer away from the substrate. On one side, the composite structure layer is arranged on the side of the disulfide layer away from the substrate, and the composite structure layer includes a plurality of nanostructure parts, and each nanostructure part includes a first nanorod, a second nanorod, a third nanorod, The fourth nanorod and the fifth nanorod, the second nanorod, the third nanorod, the fourth nanorod and the fifth nanorod are all inclined on the sidewall of the first nanorod, and the second nanorod, the third nanorod The material of at least one of the nanorods, the fourth nanorod and the fifth nanorod is a phase change material; when the chirality needs to be enhanced, circularly polarized light is used to irradiate the surface of the device, and the optical signal is in the composite structure layer and the medium. A guided mode resonance is generated between the layers, and a surface plasmon resonance is generated on the upper surface of the substrate, thereby enhancing the heat loss and surface current of the disulfide layer, thereby making the circularly polarized light and the device of the present application. The interaction between the two is increased, thereby enhancing the optical chirality of the composite structure layer, so as to achieve the purpose of enhancing chirality; in addition, due to the The material is a phase change material, and the temperature change makes the conductivity of the second nanorod, the third nanorod, the fourth nanorod and the fifth nanorod change, thereby causing the refractive index of the device of the present application to change, thereby making the circular The spectrum of the dichroism changes, that is, the application can realize the dynamic regulation of the CD signal by changing the temperature.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore do not It should be regarded as a limitation of the scope, and for those of ordinary skill in the art, other related drawings can also be obtained according to these drawings without any creative effort.

1 is a front view of the structure of a controllable dielectric chiral nano-enhancing device according to an embodiment of the present invention;

2 is a top view of the structure of a controllable dielectric chiral nano-enhancing device according to an embodiment of the present invention;

FIG. 3 is a CD enhancement effect diagram of the adjustable dielectric chiral nano-enhancing device provided by an embodiment of the present invention;

Fig. 4 is a CD regulation effect diagram of the adjustable medium chiral nano-enhancing device provided by an embodiment of the present invention;

FIG. 5 is a CD enhancement effect diagram of the adjustable dielectric chiral nano-enhancing device provided by another embodiment of the present invention;

FIG. 6 is a diagram showing the CD control effect of the controllable medium chiral nano-enhancing device provided by another embodiment of the present invention.

Icon: 10-substrate; 20-dielectric layer; 30-disulfide layer; 40-composite structure layer; 41-first nanorod; 42-second nanorod; 43-third nanorod; 44-fourth nanorod Rod; 45-fifth nanorod.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments It is an embodiment of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations.

Thus, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It should be noted that like numerals and letters refer to like items in the following figures, so once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

In order to make the implementation process of the present invention clearer, a detailed description will be given below with reference to the accompanying drawings.

FIG. 1 is a front view of the structure of a controllable dielectric chiral nano-enhancing device provided by an embodiment of the present invention; FIG. 2 is a structure of a controllable dielectric chiral nano-enhancing device provided by an embodiment of the present invention 1 and 2, the present application provides a controllable dielectric chiral nano-enhancing device, the device includes: a substrate 10, a dielectric layer 20, a disulfide layer 30 and a composite structure layer 40; a dielectric layer 20 is arranged on the side of the substrate 10, the disulfide layer 30 is arranged on the side of the dielectric layer 20 away from the substrate 10, the composite structure layer is arranged on the side of the disulfide layer 30 away from the substrate 10, and the composite structure layer includes a plurality of nanometers. Structure parts, each nanostructure part includes a first nanorod 41, a second nanorod 42, a third nanorod 43, a fourth nanorod 44 and a fifth nanorod 45, a second nanorod 42, a third nanorod 43. The fourth nanorod 44 and the fifth nanorod 45 are all inclined on the sidewall of the first nanorod 41, and the second nanorod 42, the third nanorod 43, the fourth nanorod 44 and the fifth nanorod The material of at least one of 45 is a phase change material.

The shapes and sizes of the substrate 10 , the dielectric layer 20 , and the disulfide layer 30 of the adjustable dielectric chiral nano-enhancing device of the present application are determined according to actual needs, and are not specifically limited here. The top of the substrate 10 is provided with the The dielectric layer 20, the upper part of the dielectric layer 20 is provided with a disulfide layer 30, the top of the disulfide layer 30 is provided with a composite structure layer 40, the composite structure layer 40 includes a plurality of nanostructure parts, a plurality of nanostructure parts It is tiled on the top of the dielectric layer 20, so that the top of the dielectric layer 20 forms the composite structure layer 40, because the composite structure layer 40 includes the first nanorods 41, the second nanorods 42, the third nanorods 43, the fourth nanorods The nanorods 44 and the fifth nanorods 45, and the second nanorods 42, the third nanorods 43, the fourth nanorods 44 and the fifth nanorods 45 are respectively inclined around the first nanorods 41. The angles between the nanorods 42, the third nanorods 43, the fourth nanorods 44, the fifth nanorods 45 and the first nanorods 41 are set according to actual needs, and are not specifically limited here. Two nanorods 42 , a third nanorod 43 , a fourth nanorod 44 and a fifth nanorod 45 are respectively disposed on opposite sides of the first nanorod 41 . When the chirality needs to be enhanced, circularly polarized light is used to illuminate the surface of the device, the optical signal generates guided mode resonance between the composite structure layer 40 and the dielectric layer 20 , and generates surface plasmon polarization on the surface of the substrate 10 Excimer resonance, thereby enhancing the thermal loss and surface current of the disulfide layer 30, thereby increasing the interaction between the circularly polarized light and the device of the present application, thereby enhancing the optical chirality of the composite structure layer 40, Thereby, the purpose of enhancing chirality is achieved; in addition, since the materials of the second nanorods 42, the third nanorods 43, the fourth nanorods 44 and the fifth nanorods 45 are phase change materials, the temperature change makes the second nanorods 42. The change of the electrical conductivity of the third nanorod 43, the fourth nanorod 44 and the fifth nanorod 45, thereby causing the change of the refractive index of the device of the present application, and then changing the spectrum of the circular dichroism, that is, the present invention. The application can realize the dynamic regulation of the CD signal by changing the temperature, and the material of at least one of the second nanorods 42, the third nanorods 43, the fourth nanorods 44 and the fifth nanorods 45 is a phase change material, that is, the first The second nanorod 42 and the fourth nanorod 44 are phase change materials, the third nanorod 43 and the fifth nanorod 45 are reference materials, and the second nanorod 42, the third nanorod 43, the fourth nanorod 44 and the The type of the phase change material of the fifth nanorods 45 is determined according to actual needs, and is not specifically limited here, as long as the phase change material can change the temperature so that the conductivity of the phase change material also changes.

The specific beneficial effects of the device provided by the present application are as follows: (1) The present application generates an absorbed circular dichroism signal by using a phase change material to construct a chiral pattern in the composite structure layer 40 to break the symmetry. The composite structure layer 40 and the dielectric layer 20 generate guided mode resonance, and the surface of the substrate 10 generates surface plasmon resonance, so that the heat loss and surface current of the disulfide layer 30 disposed on the lower surface of the composite structure layer 40 are enhanced. , thereby improving the interaction between circularly polarized light and dielectric chiral nanodevices and enhancing the optical chirality of dielectric chiral nanodevices. (2) The adjustable dielectric chiral nano-enhancing device provided by the present invention, by changing the ambient temperature of the adjustable dielectric chiral nano-enhancing device, further, the phase change material changes from the dielectric state to the metal state, which can be Dynamically modulate its circular dichroism signal.

Optionally, an axial length of the nanostructure portion parallel to the first nanorods 41 is 460 nm-500 nm, and an axial length of the nanostructure portion perpendicular to the first nanorods 41 is 460 nm-480 nm.

The length of the nanostructure portion along the first nanorod 41 may be 460 nm, 500 nm, or any size between 460 nm and 500 nm, and the width of the nanostructure portion along the first nanorod 41 may be 460nm, can also be 480nm, can also be any size between 460nm-480nm.

The angles and lengths of the second nanorods 42 , the third nanorods 43 , the fourth nanorods 44 and the fifth nanorods 45 are set to improve the asymmetry of the overall structure, thereby enhancing the CD signal of the entire structure. The addition of the disulfide layer 30 can enhance the coupling of the entire structure with incident light, thereby enhancing the CD of the entire structure.

Optionally, the distance between the same point of the second nanorod 42 and the third nanorod 43 is 140nm-190nm.

Since the second nanorods 42 and the third nanorods 43 are arranged on the same side of the first nanorods 41 , and the angle between the second nanorods 42 and the third nanorods 43 and the first nanorods 41 is All are the same, that is, the second nanorod 42 and the third nanorod 43 are parallel to each other. For the convenience of explaining the setting positions of the second nanorod 42 and the third nanorod 43 The contact position of the rods 41 is the starting point, and the third nanorods 43 are arranged extending to any size between 140 nm and 190 nm in the longitudinal direction of the first nanorods 41 .

Optionally, the distance between the same point of the fourth nanorod 44 and the fifth nanorod 45 is 140nm-190nm.

Since the fourth nanorod 44 and the fifth nanorod 45 are arranged on the same side of the first nanorod 41 , and the included angle between the fourth nanorod 44 and the fifth nanorod 45 and the first nanorod 41 All are the same, that is, the fourth nanorod 44 and the fifth nanorod 45 are parallel to each other. The contact position of the rods 41 is the starting point, and the fifth nanorods 45 are arranged to extend any size between 140 nm and 190 nm in the longitudinal direction of the first nanorods 41 .

Optionally, the length of the second nanorod 42 is not equal to the length of the third nanorod 43 , and the length of the fourth nanorod 44 is not equal to the length of the fifth nanorod 45 .

In order to make the asymmetry between the length of the second nanorod 42 and the third nanorod 43 stronger, the length of the second nanorod 42 is set to be unequal to the length of the third nanorod 43, so that the The enhanced chirality is stronger. In addition, in order to make the asymmetry between the length of the fourth nanorod 44 and the fifth nanorod 45 stronger, the length of the fourth nanorod 44 is set to be the same as that of the fifth nanorod 45 . The lengths of the rods 45 are not equal, so that the enhanced chirality is stronger, and this setting makes the enhancement degree of the chirality of the present application stronger,

Optionally, the included angles of the second nanorod, the third nanorod, the fourth nanorod and the fifth nanorod and the sidewall of the first nanorod are equal.

In practical applications, generally the second nanorods 42 and the third nanorods 43 are disposed on one side of the first nanorods 41 , and the fourth nanorods 44 and the fifth nanorods 45 are disposed on the other side of the first nanorods 41 . On one side, generally, the length of the first nanorod 41 parallel to the axial direction is 380 nm-400 nm, and the length perpendicular to the axial direction is 90 nm-110 nm. The included angles between the rods 43, the fourth nanorods 44, the fifth nanorods 45 and the first nanorods 41 are all set to the same angle, that is, the second nanorods 42, the third nanorods 43, the fourth nanorods 44 and the fifth nanorod 45 are arranged parallel to each other, and the materials of the second nanorod 42, the third nanorod 43, the fourth nanorod 44 and the fifth nanorod 45 are phase change materials, that is, the second nanorod 42, the The three nanorods 43 , the fourth nanorods 44 and the fifth nanorods 45 make the electrical conductivity inside the second nanorods 42 , the third nanorods 43 , the fourth nanorods 44 and the fifth nanorods 45 under the action of temperature. Changed, in practical applications, the materials of the second nanorods 42 , the third nanorods 43 , the fourth nanorods 44 and the fifth nanorods 45 are vanadium dioxide or tellurium antimony germanium, so that the second nanorods 42 , the electrical conductivity of the third nanorod 43, the fourth nanorod 44 and the fifth nanorod 45 increase with the increase of temperature, and vice versa, do not repeat them here, and generally, the second nanorod 42. The length of the projection of the third nanorod 43, the fourth nanorod 44 and the fifth nanorod 45 parallel to the axis of the first nanorod 41 is 50nm-60nm, and the length of the projection perpendicular to the axis of the first nanorod 41 is 50nm-60nm. The length of the upward projection is 80nm-120nm, and the height of the composite structure layer 40 composed of the first nanorods 41, the second nanorods 42, the third nanorods 43, the fourth nanorods 44 and the fifth nanorods 45 is 190nm-210nm, the refractive index of the material of the dielectric layer 20 is lower than that of the material of the composite structure layer 40, so that the dielectric layer 20 can localize more light field energy, generally the material of the dielectric layer 20 It is one or more of silicon dioxide, germanium dioxide, and aluminum oxide. In practical applications, the thickness of the dielectric layer 20 is 240nm-250nm.

Optionally, the included angles of the second nanorod, the third nanorod, the fourth nanorod and the fifth nanorod and the sidewall of the first nanorod are not equal.

Optionally, the included angles between the second nanorods 42 , the third nanorods 43 , the fourth nanorods 44 and the fifth nanorods 45 and the side walls of the first nanorods 41 are all 45 degrees.

When the included angles of the second nanorod 42, the third nanorod 43, the fourth nanorod 44 and the fifth nanorod 45 and the sidewall of the first nanorod 41 are all set to 45 degrees, the The asymmetry is the highest, and the CD signal is the strongest at this time. In practical applications, the second nanorod 42 , the third nanorod 43 , the fourth nanorod 44 and the fifth nanorod 45 The included angle can be any acute angle.

Optionally, the material of the disulfide layer 30 is MoS ₂ and/or WS ₂ .

The material of the disulfide layer 30 may be MoS ₂ , WS ₂ , or a mixed material of MoS ₂ and WS ₂ , which is not specifically limited herein.

Optionally, the material of the substrate 10 is gold and/or silver.

The material of the substrate 10 may be gold, silver, or a mixed material of gold or silver, which is not specifically limited herein.

Optionally, the material of the first nanorods 41 is a high refractive index material.

The present application generates an absorbing circular dichroism signal by constructing a chiral pattern in the composite structure layer 40 with a high refractive index material and a phase change material to break the symmetry. The composite structure layer 40 and the dielectric layer 20 generate guided mode resonance, and the upper surface of the substrate 10 generates surface plasmon resonance, so that the heat loss of the disulfide layer 30 disposed on the lower surface of the composite structure layer 40 and the surface The current is enhanced, which in turn improves the interaction between the circularly polarized light and the dielectric chiral nanodevice, and enhances the optical chirality of the dielectric chiral nanodevice.

In order to further illustrate the enhancement of chirality of the device of the present application, the numerical simulation data is now used to illustrate, as follows:

FIG. 3 is a CD enhancement effect diagram of the adjustable dielectric chiral nano-enhancing device provided by an embodiment of the present invention; as shown in FIG. 3 , under the excitation of circularly polarized light in Embodiment 1 of the present invention, the CD spectral intensity is significantly increased enhanced. Without MoS ₂ , CDCNs have a CD of 0.45 at λ _I = 578 nm and a CD of 0.14 at λ _II = 608 nm. Mode I is based on surface plasmon resonance, and mode I is based on guided modes. obtained by resonance. After adding MoS ₂ , mode I and mode I I undergo a slight red shift and move to λ _I = 580 nm and λ _II = 612 nm, respectively; the CD of mode I is enhanced from 0.45 to 0.8, and the CD of mode I is enhanced from 0.14 to 0.34 , the CDs of Mode I and Mode II were enhanced by 1.78 and 2.43 times, respectively. Therefore, the introduction of _MoS2 can enhance the interaction between the nanostructures and LCP light and RCP light, respectively, to various degrees, thereby enhancing the overall CD effect. The energy loss is transferred from the _CDCNs part to the MoS2 part, which forms a strong surface field _on the 2D surface of MoS2, and thus has a certain potential in enhancing the catalytic reaction and Raman scattering spectroscopy, that is, illustrating the disulfide of the present application The material layer 30 can realize the enhancement effect of degree chirality.

，用于进一步量化CD信号的可调性。模式Ⅰ和模式ⅠⅠ的TD值分别为49.89%和32.35%。这一现 象证实了我们可以通过改变温度来调节CDCNs/MoS₂的手性。考虑到当S=200S/m时，两种共 振模式是最容易观察到的，因此我们在本发明上述中保持S值不变。 FIG. 4 is a diagram showing the CD control effect of the adjustable dielectric chiral nano-enhancing device according to an embodiment of the present invention; as shown in FIG. 4 , when the material of the disulfide layer 30 is CDCNs/MoS ₂ , the Thermal tunability of the CD effect. As mentioned above, the dynamic tunability of VO2 can be simulated by changing the temperature _- dependent conductivity. Figure ₄ investigates the CD spectra of VO2 with different conductivities S. In the simulation, S was varied from 200 S/m to 100000 S/m. The CD signal changed significantly with the change of VO2, and the mode I and mode _II gradually decreased as the conductivity increased. The adjustment depth TD is defined as

, used to further quantify the tunability of the CD signal. The TD values of mode I and mode II were 49.89% and 32.35%, respectively. This phenomenon confirms that we can tune the chirality of _CDCNs /MoS by changing the temperature. Considering that the two resonance modes are most easily observed when S=200S/m, we keep the value of S unchanged in the above-mentioned invention.

FIG. 5 is a CD enhancement effect diagram of the adjustable dielectric chiral nano-enhancing device provided by another embodiment of the present invention; as shown in FIG. 5 , under the excitation of circularly polarized light in Embodiment 2 of the present invention, the CD spectral intensity is significantly enhanced. Without WS ₂ , CDCNs have a CD of 0.45 at λ _I = 578 nm and a CD of 0.14 at λ _II = 608 nm. Among them, mode I is obtained based on surface plasmon resonance, and mode I I is based on guided modes. obtained by resonance. After adding WS ₂ , the mode I and mode II have a slight red shift and move to λ _I = 580 nm and λ _II = 608 nm, respectively; the CD of mode I is enhanced from 0.45 to 0.84, and the CD of mode II is enhanced from 0.14 to 0.43 , the CD of mode I and mode II were enhanced by 1.87 times and 3.07 times, respectively. Therefore, the introduction of _WS2 can enhance the interaction between the nanostructures and LCP light and RCP light, respectively, to different degrees, thereby enhancing the overall CD effect. The energy loss is transferred from the _CDCNs part to the WS part, which forms a strong surface field _on the 2D surface of WS and thus has a certain potential in enhancing the catalytic reaction and Raman scattering spectroscopy, that is, illustrating the disulfide of the present application The material layer 30 can realize the enhancement effect of degree chirality.

，用于进一 步量化CD信号的可调性。模式Ⅰ和模式ⅠⅠ的TD值分别为65.48%和41.86%。这一现象证实了我 们可以通过改变温度来调节CDCNs/WS₂的手性。考虑到当S=200S/m时，两种共振模式是最容 易观察到的，因此我们在本发明上述中保持S值不变。综述本申请可以实现通过改变温度实 现对本申请的装置的手性的调控。 Figure 6 is a diagram of the CD regulation effect of the tunable dielectric chiral nano-enhanced device provided by another embodiment of the present invention; as shown in Figure 6, the thermal tunability of the CD effect in CDCNs/WS ₂ is studied next. As mentioned above, the dynamic tunability of VO2 can be simulated by changing the temperature _- dependent conductivity. Figure ₆ investigates the CD spectra of VO under different conductivities S. In the simulation, S was varied from 200 S/m to 100000 S/m. The CD signal changes significantly with the change of VO ₂ . With the increase of conductivity, mode I gradually decreases, and mode II increases slightly. The adjustment depth TD is defined as

, used to further quantify the tunability of the CD signal. The TD values of mode I and mode II were 65.48% and 41.86%, respectively. This phenomenon confirms that we can tune the chirality of _CDCNs /WS by changing the temperature. Considering that the two resonance modes are most easily observed when S=200S/m, we keep the value of S unchanged in the above-mentioned invention. Overview The present application can realize the regulation of the chirality of the device of the present application by changing the temperature.

The present application provides a controllable dielectric chiral nano-enhancing device, the device includes: a substrate 10, a dielectric layer 20, a disulfide layer 30 and a composite structure layer 40; the dielectric layer 20 is disposed on one side of the substrate 10, and the disulfide layer 30 It is arranged on the side of the dielectric layer 20 away from the substrate 10, and the composite structure layer is arranged on the side of the disulfide layer 30 away from the substrate 10. The composite structure layer includes a plurality of nanostructure parts, and each nanostructure part includes a first nanorod. 41, the second nanorod 42, the third nanorod 43, the fourth nanorod 44 and the fifth nanorod 45, the second nanorod 42, the third nanorod 43, the fourth nanorod 44 and the fifth nanorod 45 are all It is obliquely arranged on the side wall of the first nanorod 41, and the material of at least one of the second nanorod 42, the third nanorod 43, the fourth nanorod 44 and the fifth nanorod 45 is a phase change material; When the property is enhanced, circularly polarized light is used to illuminate the surface of the device, and the optical signal generates guided mode resonance between the composite structure layer 40 and the dielectric layer 20, so that surface plasmon polaritons are generated on the upper surface of the substrate 10 resonance, thereby enhancing the thermal loss and surface current of the disulfide layer 30, thereby increasing the interaction between the circularly polarized light and the device of the present application, thereby enhancing the optical chirality of the composite structure layer 40, thereby achieving The purpose of chirality enhancement; in addition, since the materials of the second nanorods 42, the third nanorods 43, the fourth nanorods 44 and the fifth nanorods 45 are phase change materials, the temperature changes make the second nanorods 42, The change of the electrical conductivity of the third nanorod 43 , the fourth nanorod 44 and the fifth nanorod 45 causes the change of the refractive index of the device of the present application, thereby changing the spectrum of circular dichroism, that is, the present application can By changing the temperature, the dynamic regulation of CD signal is realized.

The present application provides a controllable medium chiral nano-enhancing system, the system includes: a temperature control device, a chiral molecular solution, a spectrometer and any one of the above-mentioned adjustable medium chiral nano-enhancing device, the temperature control device is arranged in the device The outside of the composite structure layer 40 is used to change the temperature of the composite structure layer 40, the molecular solution is filled in the gap of the composite structure layer 40, and the spectrometer is used to detect the spectrum of the emitted light of the device.

The controllable composite medium chiral nano-enhancing system provided by the present invention, by covering a layer of chiral molecule solution on the composite structure layer 40, under the excitation of circularly polarized light, the chiral signal of the chiral molecule is strongly amplified, The enhancement of chirality is obtained by the detection of left-handed circular light and right-handed circular light by spectrometer.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. A tunable, chiral nanoenhanced device of a medium, the device comprising: the device comprises a substrate, a dielectric layer, a disulfide layer and a composite structure layer; the dielectric layer is arranged on one side of the substrate, the disulfide layer is arranged on one side of the dielectric layer far away from the substrate, the composite structure layer is arranged on one side of the disulfide layer far away from the substrate, the composite structure layer comprises a plurality of nanostructure parts, each nanostructure part comprises a first nanorod, a second nanorod, a third nanorod, a fourth nanorod and a fifth nanorod, the second nanorod, the third nanorod, the fourth nanorod and the fifth nanorod are obliquely arranged on the side wall of the first nanorod, and at least one of the second nanorod, the third nanorod, the fourth nanorod and the fifth nanorod is made of a phase-change material; the second nanorod and the third nanorod are arranged on the same side of the first nanorod, an included angle between the second nanorod and the third nanorod and the first nanorod is the same, the fourth nanorod and the fifth nanorod are arranged on the other side of the first nanorod, and an included angle between the fourth nanorod and the fifth nanorod is the same as that between the first nanorod.

2. The tunable, dielectric chiral nanoenhancer device of claim 1, wherein the axial length of the nanostructure portion parallel to the first nanorods is 460nm to 500nm, and the axial length of the nanostructure portion perpendicular to the first nanorods is 460nm to 480 nm.

3. The tunable, media-chiral nanoenhanced device of claim 2, wherein the distance between the same point of the second nanorods and the third nanorods is 140nm-190 nm.

4. The tunable chiral nanoenhancer device of claim 3, wherein the distance between the same point of the fourth nanorods and the fifth nanorods is 140nm-190 nm.

5. The tunable chiral nanoenhancer device of claim 4, wherein the second nanorods have a length unequal to that of the third nanorods, and the fourth nanorods have a length unequal to that of the fifth nanorods.

6. The tunable chiral media nanoenhancer device of claim 5, wherein the second, third, fourth and fifth nanorods are all at 45 ° angles to the sidewall of the first nanorod.

7. The tunable chiral media nanoenhancer device of claim 6, wherein the disulfide layer is MoS ₂ And/or WS ₂ 。

8. The tunable media chiral nanoenhancer device of claim 7, wherein the substrate is gold and/or silver.

9. The tunable, dielectric, chiral nanoenhancer device of claim 8, wherein the material of said first nanorods is a high refractive index material.

10. A regulatable media chiral nanoenhancement system, said system comprising: the device comprises a temperature control device, a chiral molecular solution, a spectrometer and the adjustable and controllable medium chiral nanometer enhancement device as claimed in any one of claims 1 to 9, wherein the temperature control device is arranged outside a composite structure layer of the device and used for changing the temperature of the composite structure layer, the molecular solution is filled in a gap of the composite structure layer, and the spectrometer is used for detecting the spectrum of emergent light of the device.

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