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Publication - Dr Mike Taverne

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

    Citation

    Chen, L, Morgan, KA, Alzaidy, G, Huang, CC, Ho, D, Taverne, M, Zheng, X, Ren, Z, Feng, Z, Zeimpekis, I, Hewak, D & Rarity, J, 2019, ‘Observation of Complete Photonic Bandgap in Low Refractive Index Contrast Inverse Rod-Connected Diamond Structured Chalcogenides’. ACS Photonics, vol 6., pp. 1248-1254

    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.

    Full details in the University publications repository