Open AccessCollimating emission from photonic crystals based on the quasi-zero-effective-index
Author(s) -
Haitao Zhao,
Yue Shen,
Zhongjie Zhang
Publication year - 2014
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.63.174204
Subject(s) - photonic crystal , finite difference time domain method , optics , collimated light , plane wave expansion method , refractive index , square lattice , materials science , physics , plane wave , photonics , optoelectronics , condensed matter physics , laser , ising model
Transmission of light waves at the frequency near the edge of the band gap in two-dimensional square lattice photonic crystals is studied by using the plane wave expansion method (PWM) and finite difference in time domain (FDTD) method. It is found that, directional emission from two-dimensional photonic crystals can be realized if the effective refractive index is nearly zero. Moreover, the direction of the emitting beam is independent of the orientation of the crystal lattice, but dependent on the direction of the crystal surface. This is quite different from the self-collimation phenomenon in photonic crystals.