Open AccessSelf-collimating photonic crystal antireflection structure for both TE and TM polarizations
Author(s) -
Jong Park,
SunGoo Lee,
Hae-Ryeong Park,
Myung–Hyun Lee
Publication year - 2010
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.18.013083
Subject(s) - photonic crystal , optics , finite difference time domain method , materials science , polarization (electrochemistry) , collimated light , transmission coefficient , reflection coefficient , fresnel equations , optoelectronics , refractive index , transmission (telecommunications) , physics , telecommunications , laser , chemistry , computer science
We present a high-efficiency antireflection structure for both TE and TM polarizations in two-dimensional self-collimating square lattice photonic crystal consisting of air holes in silicon. The design parameters of the optimal antireflection structure can be obtained by using the concept of Fresnel coefficients and the finite-difference time-domain simulations. The photonic crystal operating in almost identical self-collimation frequencies for two polarizations exhibits a large reflection coefficient for TE and a very small one for TM polarization. In this case, the antireflection structure for TE can also improve the transmission for TM polarization. To confirm a highly efficient antireflection structure designed, we investigate the transmission data of three finite photonic crystal samples consisting of 36, 38 and 40 unit cells for the cases without and with the antireflection structures through finite-difference time-domain simulations.