Fabrication and Analysis of Two- and Three-dimensional GaAs Photonic Crystals and Their Waveguide Structures
Date Issued
2006
Date
2006
Author(s)
Tsai, Hsin-Yun
DOI
zh-TW
Abstract
In some materials with periodic variation of dielectric constants and light within a certain frequency range shows exponential decay due to destructive interference and cannot propagate. This phenomenon is called photonic bandgap and this kind of structures is called photonic crystals.
In this work, we fabricated two- and three-dimensional photonic crystals and their waveguide structures.
In two-dimensional photonic crystal study, air-bridge type photonic crystals have been fabricated. We demonstrate that there is a photonic bandgap from 900nm to 940nm. Light cannot propagate in this wavelength region and this phenomenon was shown by CCD camera.
In three-dimensional photonic crystal experiment, we fabricated defect mode structures by controlling the oxidation time. We design two parameters to change the wavelength of defect mode, i.e., the defect size and the feature size. With increasing defect size and feature size, we observed the red-shift of defect mode and the wavelength shift are 62nm and 150nm respectively. Finally, we analyzed the relationship between the defect modes and s defect structures. The defect mode is most obvious where the defect structure is located. This confirms the relation between the defect mode and defect structure.
Subjects
光子晶體
二維
三維
砷化鎵
波導
Photonic crystal
Two dimensional
Three dimensional
GaAs
Waveguide
Type
thesis
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