Optical isolator

Abstract

The invention provides an optical isolator. The optical isolator comprises a metal film. The metal film has a first surface and a second surface which are opposite to each other. At least one slit and at least one first groove are arranged in the metal film. The first groove is arranged in the first surface. There is a first preset distance between the first groove and the at least one slit. When light of preset wavelength is incident on the first surface, surface plasmons excited by the first groove and surface plasmons excited by the slit arranged at the first preset distance from the first groove can interfere with each other to weaken light transmitted by the slit. According to the optical isolator provided by the invention, the slit and the groove are arranged in the metal film, surface plasmons and photons interact with each other, and the slit and the groove in the metal film are optimized, so that the limitation of diffraction limit can be overcome, and one-way transmission of light of preset wavelength at a nanometer scale can be realized.

Description

technical field [0001] The invention relates to micro-nano optical devices, in particular to an optical isolator based on surface plasmons. Background technique [0002] In modern society, information technology has become more and more important, and modern information technology has penetrated into all walks of life. The development of modern information technology has put forward higher requirements for the miniaturization and high integration of devices. In order to meet the development of modern information technology, the size and space distance of future devices will be smaller and smaller, but to a certain extent, optical Diffraction limit is another problem we have to face. [0003] In recent decades, with the continuous development of micro-processing technology and integrated optics, photonic devices have been continuously miniaturized. Compared with electronic devices, photonic devices have higher bandwidth, higher density, faster speed and lower Dissipation an...

AI Technical Summary

Problems solved by technology

However, photonic devices are restricted by the diffraction limit, and the size cannot be made too small (micron order), which cannot meet the requirements of all-optical integration.

[0004] Starting from the basic principles and technologies of traditional optics, the diffraction limit has become an insurmountable gap, and it is difficult to realize the transmission, processing and application of related technologies at the nanoscale level and structure. It cannot meet the needs of the development of modern science and technology, so we urgently need a new technology and mechanism to break through the diffraction limit. At the same time, nanoscale devices show many new functions and new phenomena that traditional devices do not have.

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