A reflective plasmonic nanostructure optical switch and its preparation method

Abstract

The invention provides a reflective plasma nanostructure photoswitch and a preparation method thereof. The reflective plasma nanostructure photoswitch comprises a polarization modulation device for changing the polarization directions of incident light, and a plasma nanostructure. The plasma nanostructure comprises a metal film on the bottom layer, a dielectric film on the middle layer, and multiple metal nano-rings distributed on the upper surface of the dielectric film. The metal nano-rings are symmetrically distributed and form a periodically-arranged metal nano-ring array. The plasma nanostructure formed by the metal film, the dielectric film and the metal nano-rings in an arrayed mode is utilized, when the incident light irradiates the plasma nanostructure in different polarization directions, the incident light can be completely reflected or fully absorbed, therefore, control over the on or off state of the incident light is formed, compared with a transmission type switch which has the problem of the low extinction ratio, the reflective plasma nanostructure photoswitch has the larger extinction ratio coefficient, and the preparation method is simple and easy to integrate.

Description

technical field [0001] The invention relates to the field of optoelectronic technology, in particular to a reflective plasma nanostructure optical switch and a preparation method thereof. Background technique [0002] An optical switch is a device that switches and converts optical signals. It can perform mutual conversion or logic operations on optical signals in optical fibers or integrated optical circuits, and plays a vital role in optical networks. Due to high efficiency and low noise, optical switches based on nonlinear optical effects have been extensively and in-depth researched, but the nonlinear effects of materials require an external high-power light source (cross pumping) or high-intensity signal light source (self-pumping). , thus severely limiting its generalization in practical applications. [0003] Electromagnetically Induced Transparency (EIT) is a quantum effect of destructive interference between different excitation paths of an atomic system when atoms...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of low extinction ratio of existing transmissive optical switches, the present invention provides a reflective plasmonic nanostructured optical switch and its preparation method. The optical switch is based on the plasma-induced reflection of a planar plasmonic nanostructure ( Plasmon-Induced Reflectance, PIR) effect, realizes the use of incident light polarization to control the opening and closing of the optical switch, thus avoiding the problem of low extinction ratio existing in the existing transmissive optical switch

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