Affordable Access

deepdyve-link deepdyve-link
Publisher Website

Creation of large band gap with anisotropic annular photonic crystal slab structure.

Authors
Type
Published Article
Journal
Optics Express
1094-4087
Publisher
The Optical Society
Publication Date
Volume
18
Issue
5
Pages
5221–5228
Identifiers
DOI: 10.1364/OE.18.005221
PMID: 20389535
Source
Medline
License
Unknown

Abstract

A two-dimensional anisotropic annular photonic crystal slab structure composed of circular air holes and dielectric rods with finite thickness in a triangular lattice is presented to achieve an absolute photonic band gap. Positive uniaxial crystal Tellurium is introduced to the structure with the extraordinary axis parallel to the extension direction of rods. The role of each geometric parameter is investigated by employing the conjugate-gradient method. A large mid-gap ratio is realized by the parameter optimization. A flat band called as anomalous group velocity within two large gaps is discovered and can be widely applied in many fields. A hybrid structure with GaAs slab and Te rods is designed to achieve a large gap and demonstrates that the annular structure can improve the gap effectively.

Statistics

Seen <100 times