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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.


Y. Fang

D. Jayasuriya

H. Parnell

R. Crane

Z.Q. Tang

C.L. Canedy

C.S. Kim

M. Kim

C.D. Merritt

W.W. Bewley

I. Vurgaftman

J.R. Meyer

Professor of Inorganic Materials

T.M. Benson


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.


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.

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
Public URL
Publisher URL


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