Slow light waveguide structure based on photonic crystal air bridge structure

Abstract

The invention discloses a slow light waveguide structure based on a photonic crystal air bridge structure, which adopts a line defect photonic crystal structure, and comprises a longitudinal structure and a horizontal structure, wherein, the longitudinal structure is an air bridge multi-layer structure which comprises an air layer, a semiconductor material layer, an air layer and a substrate material layer from the top layer to the bottom layer; the horizontal structure adopts a triangular lattice structure, the period is P, and the radius is R; and the waveguide is formed through removing a row of holes. Through changing the size of the line defect nearby hole, the slow light waveguide structure of the invention realizes a slow light working area reaching up to 50 nanometers; the central wavelength can be adjusted through the width of the waveguide, which can be realized only in need of the small holes with two types of apertures within the requirement range of hundreds of nanometers of operating wavelengths, thus lowering the requirement of device parameter adjustment in a certain technological condition. By utilizing the slow light photonic crystal waveguide of the slow optical waveguide structure based on the photonic crystal air bridge structure, the bandwidth can cover the C wave band of the fiber-optical communication, and can achieve 50nm.

Description

technical field [0001] The invention relates to the technical field of photonic crystal slow light waveguide design and photonic optoelectronic device design, in particular to a slow light waveguide structure based on a photonic crystal air bridge structure. Background technique [0002] The slow light effect device is one of the key devices in the new generation of optical communication, optical storage and photonic devices. Due to its own characteristics, photonic crystals have been a research hotspot in recent years, and various effects have been discovered and utilized continuously. Almost all active and passive photonic devices can be designed and manufactured using the theory and materials of photonic crystals. Many of its unique features are eye-catching, such as the small-sized large-angle bending lossless waveguide based on the photonic crystal band gap, the superprism based on the large dispersion effect at the band edge, and the imaging lens that breaks through t...

AI Technical Summary

Problems solved by technology

[0004] The photonic crystal slow-light effect waveguide is the basis for the design of photonic crystal slow-light devices. Previously, many literatures reported that photonic crystal line defects can be used as slow-light devices, and the group refractive index can reach more than 100, but the design of large bandwidth has not been reported. Here We define the slow light operating bandwidth as the single-mode continuous operating region with a group refractive index greater than 10

Ordinary slow-light photonic crystal waveguide bandwidth is several nanometers, so it is difficult to meet the requirements of large bandwidth in optical communication

In addition, the working wavelength position is generally changed by adjusting the lattice period of the photonic crystal by keeping the duty cycle constant. In this way, the devices required for different working areas require different process conditions, which makes the design more difficult.

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