Ultraviolet hollow-core waveguides with sub-unitary index chalcogenide cladding

Li, Jinxiang, Gholipour, Behrad, Piccinotti, Davide, MacDonald, Kevin F. and Zheludev, Nikolai (2020) Ultraviolet hollow-core waveguides with sub-unitary index chalcogenide cladding. Optical Materials Express, 10 (9), 2254-2261. (doi:10.1364/OME.400058).

Record type: Article

Abstract

The chalcogenide semiconductor antimony telluride exhibits a sub-unitary refractive index as low as 0.7 at mid- to near-UV wavelengths between 220 and 400 nm, with the spectral width of the sub-unitary band, minimum index and associated extinction coefficient being controllable functions of alloy composition. As such it can enable step-index hollow-core optical waveguiding at ultraviolet wavelengths and thereby, for example, spectroscopic and sensing applications wherein the confinement of light and a fluid analyte in the same core volume maximizes sensitivity, thereby limiting required interaction lengths to as little as a few wavelengths.

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Accepted/In Press date: 31 July 2020

Published date: 1 September 2020

Additional Information: Funding Information: Engineering and Physical Sciences Research Council (EP/M009122/1); Ministry of Education - Singapore (MOE2016-T3-1-006); China Scholarship Council (201708440254). Publisher Copyright: © The Optical Society under the terms of the Creative Commons Attribution 4.0 License.

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