Phototonic crystal waveguide tunable by a resonant stub

摘要

A photonic crystal waveguide apparatus has a photonic crystal having a waveguide (44) which is capable of transmitting light having a frequency within a bandgap of the photonic crystal, and a resonant stub (47) connected to the waveguide to control light in the waveguide. The resonant stub has a resonator region (48) and a connecting channel (50) which connects the resonator region to the waveguide. The resonant stub controls light transmission characteristics of the waveguide by creating a transmission zero in the transmission band of the waveguide. A tuner for tuning the resonant stub may also be provided to control the transmission zero to provide an active optical apparatus such as an on/off switch or a modulator. <IMAGE>