Coupler structure based on graphene and three layers of super-surfaces and preparation method

Abstract

A coupler structure based on graphene and three layers of super-surfaces relates to the field of photonic integrated devices and comprises the following parts of at least one first layer of super-surface, at least one second layer of super-surface and a third layer of super-surface that are not contacted mutually, wherein the third layer of super-surface is located at the bottom; an insulator structural layer; a graphene structural layer and a substrate that are respectively arranged on upper and lower surfaces of the insulator structural layer, wherein the refractive indexes of the first andsecond layers of super-surfaces are greater than that of a first insulating layer, and the refractive index of the third layer of super-surface is greater than that of a first sub-structure. By designing the three layers of super-surfaces and the graphene structural layer in the coupler structure provided by the invention, the beam propagation path and effective refractive indexes of each layer are adjusted by the three layers of super-surfaces, the contrast of refractive indexes of the first sub-structure and the third layer of super-surface is reduced, and the operation bandwidth of the coupler is effectively increased; the graphene structural layer can further increase the operation bandwidth of the coupler, and the arrangement structure of matrix unit arrays with three layers of super-surfaces can effectively improve the coupling efficiency of the coupler.

Description

technical field

[0001] The invention relates to the field of photonic integrated devices, in particular to a coupler structure and a preparation method based on graphene and a three-layer metasurface. Background technique

[0002] In the field of photonic integrated devices, the coupler is an important photonic integrated passive device as a window for transmitting optical path information between devices and between devices and the outside world. There are three most important reference performance indicators for the pros and cons of couplers: coupling efficiency, bandwidth, and polarization dependence. How to improve the coupling efficiency, increase the coupling bandwidth, and reduce the polarization dependence is the key to designing and researching coupling devices with excellent performance.

[0003] There are many defects in existing couplers, such as insufficient coupling efficiency, insufficient bandwidth, and polarization sensitivity. Contents of the invention ...

Images