We theoretically introduce a new type of optical all-pass filter based on guided resonance in coupled photonic crystal slabs. The filter exhibits near-complete transmission for both on- and off-resonant frequencies and yet generates large resonant group delay. We further show that such a filter can be mechanically switched into a flat-top band rejection filter.
© 2003 Optical Society of America
(120.2440) Instrumentation, measurement, and metrology : Filters
(230.3990) Optical devices : Micro-optical devices
(230.5750) Optical devices : Resonators
(260.5740) Physical optics : Resonance
Wonjoo Suh and Shanhui Fan, "Mechanically switchable photonic crystal filter with either all-pass transmission or flat-top reflection characteristics," Opt. Lett. 28, 1763-1765 (2003)