Observation of Complete Photonic Bandgap in Low Refractive Index Contrast Inverse Rod-Connected Diamond Structured Chalcogenides

Lifeng Chen, Katrina A. Morgan, Ghada A. Alzaidy, Chung-Che Huang, Ying-Lung Daniel Ho, Mike P. C. Taverne, Xu Zheng, Zhong Ren, Zhuo Feng, Ioannis Zeimpekis, Daniel W. Hewak, John G. Rarity

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Three-dimensional complete photonic bandgap materials or photonic crystals block light propagation in all directions. The rod-connected diamond structure exhibits the largest photonic bandgap known to date and supports a complete bandgap for the lowest refractive index contrast ratio down to nhigh/nlow ∼ 1.9. We confirm this threshold by measuring a complete photonic bandgap in the infrared region in Sn–S–O (n ∼ 1.9) and Ge–Sb–S–O (n ∼ 2) inverse rod-connected diamond structures. The structures were fabricated using a low-temperature chemical vapor deposition process via a single-inversion technique. This provides a reliable fabrication technique of complete photonic bandgap materials and expands the library of backfilling materials, leading to a wide range of future photonic applications.
Original languageEnglish
Pages (from-to)1248-1254
Number of pages7
JournalACS Photonics
Volume6
Issue number5
Early online date9 Apr 2019
DOIs
Publication statusPublished - 15 May 2019

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