The design, fabrication, and characterization of a one-dimensional photonic crystal optical filter that has a relatively narrow, flat-topped passband within a wide stop band and small angular sensitivity is presented. The filter is based on a one-dimensional photonic crystal structure that has multiple defects, facilitating simultaneous minimization of the angular sensitivity and optimization of the passband's characteristics. We use epitaxially grown and selectively oxidized GaAs/Al_xO_y multilayers to achieve a high-index-contrast material system and incorporate the experimentally determined optical and material properties into the design of the device. A flat-topped bandpass filter with a bandwidth of 65 nm and a wide field of view of 50° is experimentally characterized and compared with the design predictions.
© 2005 Optical Society of America
(230.4170) Optical devices : Multilayers
(310.1860) Thin films : Deposition and fabrication
(310.6860) Thin films : Thin films, optical properties
(350.2460) Other areas of optics : Filters, interference
Chyong-Hua Chen, Kevin Tetz, Wataru Nakagawa, and Yeshaiahu Fainman, "Wide-field-of-view GaAs/Al_xO_y one-dimensional photonic crystal filter," Appl. Opt. 44, 1503-1511 (2005)