CN105372756A - Optical-gain gold nanowire-enhanced surface plasmon transmission device - Google Patents

Abstract

The invention discloses an optical gain gold nanowire enhanced surface plasmon propagation device, which is characterized in that it comprises a base layer, an L-shaped glass layer, a dye layer, and an Au nanowire array waveguide layer sequentially stacked, wherein the glass layer The outer end surface of the L-shaped long side is overlapped with the dye layer, and the inner end surface of the L-shaped long side is overlapped with the base layer. The Au nanowire array waveguide layer is an Au nanowire array waveguide structure. This device can achieve greater bandwidth advantages in nanoscale data transmission at visible light frequencies, and has strong mode constraints, which can realize SPP gain compensation.

Description

An Optically Gained Gold Nanowire Enhanced Surface Plasmon Propagation Device

technical field

The invention relates to the technical field of optical communication, in particular to an optical gain gold nanowire enhanced surface plasmon propagation device.

Background technique

Surface plasmon polariton (SPP for short) is an electromagnetic mode between a light wave and a migratable surface charge realized by changing the subwavelength structure of the metal surface, which can support the surface plasmon wave transmitted at the interface between the metal and the medium, thereby transmitting Light energy, and is not limited by the diffraction limit. Because of the unique properties of SPP, it plays an important role in manipulating light energy at the nanometer level. In particular, the metal groove SPP waveguide proposed in the article "Novelsurfaceplasmonwaveguideforhighintegrations" by the research group of Zhejiang University and the Alphen Laboratory of the Royal Institute of Technology in Sweden, the designed waveguide structure can achieve sub-wavelength optical field confinement, and the loss is only 4dB/μm. However, although the researchers have achieved the confinement of the optical field to the order of tens of nanometers, the designed waveguide device is still very lossy and cannot meet the requirements of large-scale applications.

"Nature Photonics" published the article "Amplification of long-range surface plasmons by adipolar gain medium" on pages 382-387 of Volume 4, Issue 6, 2010. DeLeon and Berini reported the use of a strip waveguide structure to realize SPP lossless propagation loss compensation. Although this structure can achieve optical gain and SPP enhancement, current studies have found that the SPP localization advantage of strip waveguides is weak, which reduces the advantages of SPP subwavelength components to a certain extent. Apparently realizing loss-compensation and enhancement of localization effect in SPP propagation is the primary goal of transforming SPP sub-wavelength components into practical ones.

Through search and novelty search, it is found that strip waveguide structures and metal thin films are currently used to enhance the SPP localization effect, but the localization effects of these structures still cannot meet the requirements of optoelectronic device integration, and the light propagation distance is limited.

Contents of the invention

The object of the present invention is to provide an optical gain gold nanowire enhanced surface plasmon propagation device for the deficiencies of the prior art. This device can achieve greater bandwidth advantages in nanoscale data transmission at visible light frequencies, and has strong mode constraints, which can realize SPP gain compensation.

The technical scheme that realizes the object of the present invention is:

A gold nanowire-enhanced surface plasmon propagation device for optical gain, comprising a base layer, an L-shaped glass layer, a dye layer, and an Au nanowire array waveguide layer sequentially stacked, wherein the outer end surface of the L-shaped long side of the glass layer is connected to the The dye layers are overlapped, and the inner end surface of the L-shaped long side is overlapped with the base layer.

The base layer is a silicon dioxide base layer.

The Au nanowire array waveguide layer is an Au nanowire array waveguide structure. The design of the array structure can improve the strong localization characteristics of the SPP.

The dye layer is made of polymethyl methacrylate (PMMA), and deposited on the surface of the glass substrate by electrophoresis.

The glass layer is high transmittance BK7 glass.

The Au nanowires are prepared by liquid crystal template method.

The silicon dioxide base layer can block most of the reflected light and refracted light in the SPP propagation, and reduce the SPP propagation loss.

Through the He-Ne laser, the laser with a wavelength of 632nm is incident on the glass layer to one end of the NW (nanowire, nanowire) to realize SPP laser, and the 488nm argon ion laser irradiates the middle position of the Au nanowire in a wide range, in the Au nanowire array. The other end face realizes the photon and SPP energy conversion, because the symmetry overcomes the momentum mismatch, which can significantly enhance the output light power, and realize the increase in the output signal intensity by controlling the concentration of the optical gain dye.

This device uses the classic Kretschmann structure to excite SPP, uses Au nanowires in subwavelength optical components to realize SPP propagation, further enhances the strong local effect of SPP through pump light, and uses dye gain to increase the propagation distance of SPP without sacrificing The sub-wavelength size of the waveguide improves the SPP propagation distance. This device can provide key components for the application of SPP in new photonic devices, broadband communication systems, micro photonic circuits, and optoelectronic integration.

This device can achieve greater bandwidth advantages in nanoscale data transmission at visible light frequencies, and has strong mode constraints, which can realize SPP gain compensation.

Description of drawings

Fig. 1 is the structural representation of embodiment.

In the figure, 1. He-Ne laser 2. Argon ion laser 3. Au nanowire array waveguide layer 4. Dye layer 5. Glass layer 6. Base layer.

detailed description

The content of the present invention will be further described below in conjunction with the accompanying drawings and embodiments, but the present invention is not limited thereto.

Example:

Referring to Fig. 1, a gold nanowire-enhanced surface plasmon propagation device for optical gain, comprising sequentially stacked base layer 6, L-shaped glass layer 5, dye layer 4, Au nanowire array waveguide layer 3, wherein the glass layer 5. The outer end surface of the L-shaped long side is overlapped with the dye layer 4 , and the inner end surface of the L-shaped long side is overlapped with the base layer 6 .

The base layer 6 is a silicon dioxide base layer. The silicon dioxide base layer can block most of the reflected light and refracted light in the SPP propagation, reducing the SPP propagation loss.

The Au nanowire array waveguide layer 3 is an Au nanowire array waveguide structure. The design of the array structure can improve the strong localization characteristics of the SPP. Au nanowires were prepared by liquid crystal template method.

The dye layer 4 is made of polymethyl methacrylate (PMMA), and deposited on the surface of the glass substrate by electrophoresis.

The L-shaped glass layer 5 is BK7 glass with high transmittance.

Through the He-Ne laser 1, the laser with a wavelength of 632nm is incident on the glass layer 5 to one end of the NW (nanowire, nanowire) to realize the SPP laser, and the 488nm argon ion laser 2 performs a wide range of pumping light emitted from the middle position of the Au nanowire at 488nm The energy conversion between photons and SPP is realized on the other end of the Au nanowire array. Because the symmetry overcomes the momentum mismatch, the outgoing light power can be significantly enhanced, and the output signal intensity can be increased by controlling the concentration of the optical gain dye.

This device uses the classic Kretschmann structure to excite SPP, uses Au nanowires in subwavelength optical elements to realize SPP propagation, further improves the strong local effect of SPP through pump light, and uses dye gain to increase the propagation distance of SPP without sacrificing The sub-wavelength dimension of the waveguide achieves improved SPP propagation distance.

Claims (2)

1. the nanowires of gold of an optical gain strengthens the transmission device of surface plasma, it is characterized in that, comprise basalis, L shape glassy layer, dye coating, Au nano-wire array ducting layer that order is spliced, wherein the outer face on the long limit of glassy layer L shape and dye coating splice, and inner face and the basalis on the long limit of L shape splice.

2. the nanowires of gold of optical gain according to claim 1 strengthens the transmission device of surface plasma, and it is characterized in that, described Au nano-wire array ducting layer is Au nano-wire array waveguiding structure.