Ultramicro polarization beam splitter based on photonic crystal micro-resonance loop

Abstract

The invention discloses an ultramicro polarization beam splitter based on a photonic crystal micro-resonance loop. The photonic crystal micro-resonance loop has different cavity mode frequencies for TM and TE polarized lights, a micro-loop and a photonic crystal waveguide are adjacently placed, the non-resonant polarized light of a waveguide mode and a cavity mode are output along an original input direction, the resonant polarized light turns to the other end of a resonance loop to be output to realize high-efficiency polarize separation. The polarization beam splitter is characterized in that: 1. two kinds of polarized light can be directly separated to be enough open without adopting an auxiliary structure; 2. the micro-resonance loop has a plurality of resonance modes and is flexible and changeable when in mode selection, and a resonant cavity is easily regulated to be applicable to different modes and output requirements; and 3. the structure is ultramicro, and not only the ultramicro polarization beam splitter can be structurally compatible with a traditional photonic crystal device, but also the process can be unified with a mature semiconductor process at present. The invention can be applied to a new generation of high-density large-scale integrated circuits and optical communication and optical information processing systems.

Description

technical field [0001] The invention relates to an ultramicro polarization beam splitter based on a photonic crystal micro-resonator ring, belonging to the technical field of optical components. Background technique [0002] As a new type of artificial microstructure, photonic crystals can confine light waves at the wavelength scale, making optical devices based on photonic crystals have the advantages of ultra-small size, easy integration, and the system is not disturbed by external electromagnetic fields. The development of high integration has brought a new application prospect. The structure of photonic crystals is composed of dielectric materials whose refractive index is distributed periodically. Photonic crystals have photonic band gaps for propagating light waves, and light waves falling in the band gaps are prohibited from propagating; defects in the complete lattice will disturb the photonic crystals. The refractive index periodic field, thus introducing defect mo...

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Problems solved by technology

Polarizing beam splitters based on traditional dielectric optical waveguides have limited applications in modern optoelectronic integrated circuits due to their large size and difficulty in integration

In order to achieve ultra-microstructures, polarization beam splitters based on photonic crystals have been studied, and can be divided into two categories: one is a composite structure that uses photonic crystals and traditional dielectric waveguides, or a positive polarizer that uses photonic crystals. The characteristics of negative refraction, this type of structure is often difficult to control the optical path due to the use of reflection and refraction light; the other type uses the characteristics of waveguide coupling, because different polarized lights have different coupling lengths, so as to achieve polarization separation, But usually a bent waveguide is needed to separate the two polarized beams sufficiently apart, which brings additional loss and larger device size

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