Carrier dispersion type all-optical switch based on asymmetric metasurface

Abstract

The invention discloses a carrier dispersion type all-optical switch based on an asymmetric metasurface. The basic structure of the all-optical switch is a metasurface array formed by periodically arranged two-dimensional asymmetric semiconductor particle structure units. Under the irradiation of pump light, a carrier dispersion effect occurs in a semiconductor particle material, the resonant wavelength of the all-optical switch device shifts due to the great increase of photon-generated carrier density, and peak-valley (or valley-peak) conversion of a characteristic frequency spectrum occurs near the working wavelength of signal light. Through the above process, a pump light beam completes on / off control of a signal light beam, and the all-optical switch which realizes light control by light is obtained. Meanwhile, the invention further provides a method for effectively reducing the pump light intensity of the all-optical switch.

Description

technical field [0001] The invention belongs to the technical field of all-optical information, and in particular relates to a carrier dispersion all-optical switch based on an asymmetric metasurface. Background technique [0002] Emerging technologies such as the Internet, the Internet of Things, big data, and cloud computing in the modern information society are based on the most basic information technologies such as data storage, transmission, and processing. The sharp increase in the amount of data has led to a surge in the amount of information that needs to be transmitted and processed. The bottleneck limitations of traditional electronic devices in terms of power consumption, delay, bandwidth, crosstalk, and noise have become increasingly prominent, and information transmission and processing are facing severe challenges. At present, the all-optical information technology using photons as information carriers is considered to be the main way to break through the phys...

AI Technical Summary

Problems solved by technology

The sharp increase in the amount of data has led to a surge in the amount of information that needs to be transmitted and processed. The bottleneck limitations of traditional electronic devices in terms of power consumption, delay, bandwidth, crosstalk, and noise have become increasingly prominent, and information transmission and processing are facing severe challenges.

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