Two-stage beam shrinkage system based on photonic crystal resonant cavity

Abstract

The invention relates to a two-stage beam shrinkage system based on a photonic crystal resonant cavity. The system consists of a first-stage photonic crystal waveguide, a photonic crystal resonant cavity, a second-stage photonic crystal waveguide and a nanowire waveguide which are closely connected and arranged in turn, wherein the second-stage photonic crystal waveguide is a W1-type photonic crystal waveguide, and the light passing width of the second-stage photonic crystal waveguide is less than that of the first-stage photonic crystal waveguide; the photonic crystal resonant cavity is formed by adding point defects into a photonic crystal, a row of medium columns are distributed at the joint between the photonic crystal resonant cavity and the first-stage photonic crystal waveguide, and a coupling area is formed by the row of medium columns; coupling medium columns are distributed at the joint between the photonic crystal resonant cavity and the W1-type photonic crystal waveguide and at a position corresponding to the point defects; and the whole system is integrated on a substrate. Due to the adoption of a two-stage compression structure, a light beam has a high compression ratio and a small emitting light spot; the photonic crystal resonant cavity is used as a medium, so that the system has high coupling efficiency and low consumption; and the whole system is integrated on the substrate, and has a small volume and a high integration level.

Description

Technical field: [0001] The invention belongs to the field of optical technology, and relates to a microstructure photonic crystal element, in particular to a two-stage beam shrinkage system based on a photonic crystal resonant cavity. Background technique: [0002] Photonic crystals are artificial microstructures formed by substances with different dielectric constants arranged periodically in space. In recent years, optoelectronic functional devices based on photonic crystal materials have received extensive attention. Photonic crystal optoelectronic devices such as photonic crystal waveguides, filters, optical switches, and couplers have been used The report has laid a good foundation for the realization of large-scale optoelectronic integration and all-optical networks in the future. [0003] Photonic crystals are artificial microstructures formed by periodic arrangements of media with different refractive indices. When electromagnetic waves propagate in them due to Bra...

AI Technical Summary

Problems solved by technology

But at the same time, the introduction of optical devices will complicate the structure of the graded waveguide and reduce the integration of the device

In addition, at the sub-micron scale of photonic crystal devices in the optical communication band, the diffraction effect of geometric optical devices is very obvious, which limits the application of the above two methods

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