Negative refractive index waveguide fast light device based on Dirac-like point and design method

Abstract

The invention provides a negative refractive index waveguide fast light device based on a Dirac-like point and a design method. The negative refractive index waveguide fast light device comprises an upper cladding layer and a low cladding layer, wherein the upper cladding layer and the low cladding layer are both arranged on a silicon plate, are both composed of a plurality of triangular lattice photonic crystals and have a negative refractive index, and the negative refractive index waveguide fast light device further comprises a core layer formed by silicon as a medium disposed between the upper cladding layer and the lower cladding layer; and upper boundaries, lower boundaries, left boundaries and right boundaries of the upper cladding layer and the lower cladding layer are scattering boundary conditions, and incident light enters from one side of the core layer and exits from the other side of the core layer. According to the negative refractive index waveguide fast light device, the characteristic that a frequency near the Dirac-like point can enable the effective refractive index of the photonic crystals to be negative is utilized, by controlling the frequency of the incidentlight and the thickness of the core layer, the negative refractive index of the cladding layers is achieved, and the light has the negative group velocity and the back propagation behaviors in the core layer.

Description

technical field [0001] The invention relates to a microstructure photonic crystal element, in particular to a negative refractive index waveguide fast optical device and a design method based on a Dirac-like point. Background technique [0002] Photonic crystals are artificially synthesized materials in which different media are periodically distributed in space. Since their lattice constants and operating wavelengths are on the same order of magnitude, fast optical devices based on photonic crystals are easier to achieve high integration and are suitable for optoelectronic integration. development trend. [0003] The waveguide device plays an important role in the optical communication system. In order to avoid the loss caused by the absorption and scattering of the medium when the beam is transmitted in the medium, and the divergence caused by the diffraction, the intensity of the central part of the beam is continuously attenuated, ensuring that the beam is in the medium....

AI Technical Summary

Problems solved by technology

However, due to the effective dielectric constant ε of the material eff and effective permeability μ eff It is a specific value under normal circumstances, so the function of the formed negative refractive index waveguide is relatively limited, and it is not very convenient in practical applications

Images