Determining small refractive index contrast in chalcogenide-glass pairs at mid-infrared wavelengths

Fang, Y.; Furniss, D.; Jayasuriya, D.; Parnell, H.; Crane, R.; Tang, Z.Q.; Barney, E.; Canedy, C.L.; Kim, C.S.; Kim, M.; Merritt, C.D.; Bewley, W.W.; Vurgaftman, I.; Meyer, J.R.; Seddon, A.B.; Benson, T.M.

Abstract

A two-composition thin film (Ge20Sb10Se70/Ge20Sb10Se67S3 atomic%core/cladding glasses) was fabricated using a hot-fibre-pressing technique in which both glasses follow the same post-fibre processing. A simple approach is proposed that uses normal incidence transmission spectra to determine their refractive index contrast over the wavelength range from 2 to 25 ?m with an error of less than _ 0.002. Using an improved Swanepoel method, the calculated numerical aperture of these two compositions was within _ 0.011 of that obtained from prism minimum deviation measurements. Results show that introducing 3 atomic % S into the Ge-Sb-Se glass system lowered the refractive index and blue-shifted the visible optical bandgap, the far-infrared fundamental vibrational absorption bands and the zero-dispersion wavelength.

Citation

Fang, Y., Furniss, D., Jayasuriya, D., Parnell, H., Crane, R., Tang, Z., …Benson, T. (2019). Determining small refractive index contrast in chalcogenide-glass pairs at mid-infrared wavelengths. Optical Materials Express, 9(5), 2022-2036. https://doi.org/10.1364/OME.9.002022

• Journal Article Type: Article
• Acceptance Date: Feb 28, 2019
• Online Publication Date: Apr 2, 2019
• Publication Date: May 1, 2019
• Deposit Date: Apr 1, 2019
• Publicly Available Date: Apr 1, 2019
• Journal: Optical Materials Express
• Electronic ISSN: 2159-3930
• Publisher: Optical Society of America
• Peer Reviewed: Peer Reviewed
• Volume: 9
• Issue: 5
• Pages: 2022-2036
• DOI: https://doi.org/10.1364/OME.9.002022
• Public URL: https://nottingham-repository.worktribe.com/output/1724205
• Publisher URL: https://www.osapublishing.org/ome/abstract.cfm?uri=ome-9-5-2022