Micro-nano optical switch based on surface plasmon fano resonance and cascading optical switch using same

Abstract

The invention discloses a micro-nano optical switch based on surface plasmon fano resonance. The micro-nano optical switch based on the surface plasmon fano resonance comprises a transparent substrate and is characterized in that a metal film layer, a nematic phase liquid crystal orientation conversion layer and a polarizer are superposed on the transparent substrate in sequence. The polarizer gives an initial direction of polarization to transmitting light, and the nematic phase liquid crystal orientation conversion layer is used for receiving the transmitting light having the initial direction of polarization and controlling a direction of polarization of the light transmitted through the nematic phase liquid crystal orientation conversion layer. A separate metal hole tetramer unit configuration or an array topological configuration formed by performing square arrangement or hexagonal arrangement on metal hole tetramer units is etched on the metal film layer, and four holes in the metal hole tetramer unit configuration are symmetrical in a D2h cluster mode and have orthogonal short axes and long axes. When the direction of polarization of the light transmitted through the nematic phase liquid crystal orientation conversion layer is parallel to the short axes, an optical path is opened, otherwise, the surface plasmon fano resonance is excited, and the optical path is closed. The micro-nano optical switch based on the surface plasmon fano resonance has all the advantages of liquid crystal optical switches and a wavelength selection function, while the traditional liquid crystal optical switches do not have the wavelength selection function.

Description

technical field [0001] The invention relates to a micro-nano optical switch based on surface plasmon Fano resonance and a cascaded optical switch using it. Background technique [0002] Information technology is closely related to human life and production. Its development has gone through the stages of artificial means, electromagnetic technology and electronic technology, and is now developing towards the stage of photon technology. Photon technology is a modern technology that realizes the transmission, processing and storage of information with photon as the carrier. Because the frequency of photons is more than 1000 times higher than that of electronics, it supports multi-dimensional information processing in space, and is resistant to electromagnetic interference, so photons have incomparable advantages compared with electrons in information communication: larger information carrying capacity and faster information processing Faster, better confidentiality of informat...

AI Technical Summary

Problems solved by technology

However, the traditional optical switch including liquid crystal optical switch is a kind of light intensity switch, which does not have wavelength selectivity, that is, the switching of the switch is realized simultaneously for all wavelengths.

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