Effects of the Gateway Surface Structures on Light Transmission through a Finite Photonic Crystal Waveguide
Date Issued
2005
Date
2005
Author(s)
Kuo, Ching-Yeh
DOI
en-US
Abstract
From the previous study on a metallic thin film system, it is found that properly designing one or two surface structures provides flexible change in light beaming phenomena. Based on this, computationally, we investigate the properties of light coming in and out of a finite photonic crystal waveguide with specifically designed surfaces. Numerical simulations are conducted by using the finite-difference time-domain method. The two-dimensional waveguide is composed of square-lattice dielectric cylinders. In this thesis, the dependence of the field intensity distribution, when light escapes the waveguide, on the geometry of the exit side is revealed. There are four main factors discussed on this topic. Besides, it is found that changing the structure of the illuminated side affects the total transmitted intensity only. By patterning a pair of grooves or juts aside the waveguide on the illuminated side, transmitted power can be improved efficiently. Also, the effects on light transmission enhancement capability of the numbers of grooves and juts is discussed.
Subjects
光子晶體
波導
出口結構
入口結構結構
指向性
穿透強度
刻痕
凸起
photonic crystal
waveguide
opening structure
entrance structrue
directional
transmission
groove
jut
Type
thesis
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