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 μm 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., Barney, E., Canedy, C., Kim, C., Kim, M., Merritt, C., Bewley, W., Vurgaftman, I., Meyer, J., Seddon, A., & 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
• Contract Date: Apr 1, 2019