For the first time to our knowledge the observation of near-IR multiple higher-order stopgaps in three-dimensional photonic crystals (PhCs) fabricated using the direct-laser-writing method in thick chalcogenide glass films is reported. The fabrication and etching conditions necessary to realize well-defined structures are presented. The fabricated PhCs exhibit higher-order stopgaps, which are only evident in high-quality structures. The higher-order stopgaps observed permit these high-refractive-index and high-nonlinear PhCs to be used directly as functional photonic devices operating at telecommunication wavelengths without further miniaturizing structural dimensions.
© 2008 Optical Society of America
Optical Design and Fabrication
Original Manuscript: June 30, 2008
Revised Manuscript: August 28, 2008
Manuscript Accepted: August 28, 2008
Published: October 9, 2008
Elisa Nicoletti, Guangyong Zhou, Baohua Jia, Michael James Ventura, Douglas Bulla, Barry Luther-Davies, and Min Gu, "Observation of multiple higher-order stopgaps from three-dimensional chalcogenide glass photonic crystals," Opt. Lett. 33, 2311-2313 (2008)