Observation of multiple higher-order stopgaps from three-dimensional chalcogenide glass photonic crystals
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...[Show more]
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