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A broadband surface plasmon unidirectional exciter

A surface plasmon and exciter technology, applied in the field of nanophotonics, can solve the problems of reducing device design and processing flexibility, unfavorable multi-wavelength functional devices, unfavorable practical applications, etc., to achieve high integration and high SPP Effect of excitation efficiency and high extinction ratio

Inactive Publication Date: 2015-08-12
PEKING UNIV
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Problems solved by technology

However, since these SPP unidirectional excitations are based on Bragg reflection or nearly complete coherence and destructiveness, there are strict requirements on the wavelength of the incident light, which is very unfavorable for the realization of more complex multi-wavelength functional devices.
In addition, the strict requirements on the wavelength of the incident light also means that the sample processing is required to have high precision, which increases the difficulty of sample processing
By adding a dielectric film on the surface of an asymmetric nano-slit to increase the SPP field confinement, people have obtained a broadband SPP unidirectional emitter with a bandwidth of 100nm. However, the increase of the dielectric film not only shortens the SPP transmission distance, but also reduces the device design. and processing flexibility, which is not conducive to practical application

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  • A broadband surface plasmon unidirectional exciter
  • A broadband surface plasmon unidirectional exciter
  • A broadband surface plasmon unidirectional exciter

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Embodiment Construction

[0026] The present invention will be further described through the embodiments below in conjunction with the accompanying drawings.

[0027] Such as figure 1 As shown, the broadband surface plasmon unidirectional exciter of the present invention includes: a metal film 3; and a first nanogroove 1 and a second nanogroove 2 arranged on the surface of the metal film. The widths of the first and second nanotrenches are w 1 and w 2 , the depth is h 1 and h 2 , and the distance between them is d. w 1 and w 2 Between 0.1λ and 0.3λ, where λ is the incident wavelength.

[0028] Metal thin film 3 adopts gold thin film. In order to get an A L and A R For the highest contrast between, we choose A 2 =(±)i·A 1 and exp(ik spp d)=(±)i, this gives A 2 = i·A 1 and exp(ik spp d)=i, or A 2 =-i·A 1 and exp(ik spp When d)=-i, A L =0,A R =2A 2 ; and A 2 = i·A 1 and exp(ik spp d)=-i, or A 2 =-i·A 1 and exp(ik spp When d)=i, A L =2A 1 、A R =0. Physically, the conditions ...

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Abstract

The invention discloses a one-way exciter with surface plasmons for a wideband. The one-way exciter with the surface plasmons for the wideband comprises metal film, and a first nano slot and a second nano slot which are arranged on the surface of the metal film, wherein the sizes of the first nano slot and the second nano slot are different. Relative strength and phase difference of an SPP (standard parallel port) are excited by operating and controlling the two nano slots, one-way exciting of the SPP is realized, by reducing the distance of the two nano slots to three fourths of the wave length of the excited surface plasmons, interference effect between the two nano slots is enabled to get insensitive to the dependency of the wave length, and a wideband SPP one-way exciter with a band width reaching around 200nm is realized. Meanwhile, the SPP one-way exciter further has the high performances of high SPP exciting efficiency, high extinction ratio and the like as well as submicron ultra-small size, high integration is facilitated, and thus the one-way exciter is widely applied to an SPP photon circuit with an ultra-high integration degree.

Description

technical field [0001] The invention relates to the field of nanophotonics, in particular to a broadband surface plasmon unidirectional exciter. Background technique [0002] Surface plasmon polaritons (Surface Plasmon Polariton) SPPs are currently a hot spot in nanophotonics research. The surface plasmon is a collective oscillation that exists at the interface between the metal and the medium coupled with the light wave and the free electrons in the metal. It is a special electromagnetic field in the interface bound mode. Its existence can be solved by solving the interface between the metal and the medium. It is obtained from Maxwell's equations under the boundary conditions. The biggest feature of SPPs is that they can localize the light field within the sub-wavelength size at the interface between the metal and the medium, breaking through the diffraction limit of traditional optics. At the same time, they also have a local field enhancement effect. In recent years, SPP...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S4/00G02B6/122G02F1/01B82Y20/00
Inventor 廖慧敏李智张翔陈建军龚旗煌
Owner PEKING UNIV
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