Title: Coupling theory of asymmetric photonic-crystal waveguides
Authors: Huang, Chih-Hsien
Hsieh, Wen-Feng
Cheng, Szu-Cheng
Department of Photonics
Issue Date: 2008
Abstract: The physical properties of asymmetric photonic-crystal directional couplers axe studied by using the tight-binding theory, which considers that the field distributions of photonic-crystal waveguides (PCWs) are localized around the periodic defects. From this model, the analytic formulas which describe the dispersion of the coupler and the eigenmode patterns were derived. By considering coupling up to the third nearest-neighboring between two PCWs, analytic expressions of the dispersion relations of asymmetric photonic crystal coupler are consistent with the results from the plane wave expansion method (PWEM). Due to the broken symmetry, two dispersion curves will never cross. Nevertheless, the eigenmode patterns switch their parity as the symmetric coupler does when wavevector k passes over the decoupling point.
URI: http://hdl.handle.net/11536/1052
ISBN: 978-1-934142-06-6
ISSN: 1559-9450
Begin Page: 187
End Page: 191
Appears in Collections:Conferences Paper