Open AccessUnidirectional reciprocal wavelength filters based on the square-lattice photonic crystal structures with the rectangular defects
Author(s) -
Shuai Feng,
Yiquan Wang
Publication year - 2013
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.21.000220
Subject(s) - optics , photonic crystal , photonic integrated circuit , square lattice , wavelength , coupled mode theory , waveguide , finite difference time domain method , materials science , beam propagation method , optical filter , reciprocal lattice , square (algebra) , optoelectronics , physics , refractive index , diffraction , statistical physics , geometry , mathematics , ising model
The novel all-optical unidirectional wavelength filters are studied by the finite-difference time-domain method, which are based on the two-dimensional square-lattice photonic crystal with the rectangular defects. Owing to the modes' match and mismatch between the defect and the adjacent waveguides, the unidirectional propagation of the fundamental-mode light beam resonant at a certain frequency is obtained. Through merely altering the coupling region between the defect and the input waveguide, a unidirectional dual-branch waveguide filter is designed. This kind of devices has both the abilities of wavelength filtering and unidirectional light propagation, and may be potentially applied in the future all-optical complex integrated circuits.