High-purity transmission of a slow light odd mode in a photonic crystal waveguide

Jun Tan, Ming Lu, Aaron Stein, Wei Jiang
2012 Optics Letters  
We demonstrate a novel scheme to control the excitation symmetry for an odd mode in a photonic crystal waveguide and investigate the spectral signature of this slow light mode. An odd-mode Mach-Zehnder coupler is introduced to transform mode symmetry and excite a high-purity odd mode with 20 dB signal contrast over the background. Assisted by a mixed-mode Mach-Zehnder coupler, slow light mode beating can be observed and is utilized to determine the group index of this odd mode. With slow light
more » ... nhancement, this odd mode can help enable novel miniaturized devices such as one-way waveguides.
doi:10.1364/ol.37.003189 pmid:22859128 fatcat:xliy2pqvpbdvxnxymdzk3s4o6q