Determining the continuous thermo-optic coefficients of chalcogenide glass thin films in the MIR region using FTIR transmission spectra

Fang, Yuanrong; Furniss, David; Jayasuriya, Dinuka; Parnell, Harriet; Tang, Zhuoqi; Seddon, Angela B.; Benson, Trevor M.

Abstract

A new method (FTIR continuous dn / dT method, n is refractive index and T temperature) for measuring the continuous thermo-optic coefficients of thin transparent films in the mid-infrared (MIR) spectral region is introduced. The technique is based on Fourier transform infrared (FTIR) transmission spectra measured at different temperatures. It is shown that this method can successfully determine the thermo-optic coefficient of chalcogenide glass thin films (of batch compositions Ge20Sb10Se70 at. % (atomic %) and Ge16As24Se15.5Te44.5 at. %) over the wavelength range from 2 to 25 µm. The measurement precision error is less than ±11.5 ppm / ºC over the wavelength range from 6 to 20 µm. The precision is much better than that provided by the prism minimum deviation method or an improved Swanepoel method.

Citation

Fang, Y., Furniss, D., Jayasuriya, D., Parnell, H., Tang, Z., Seddon, A. B., & Benson, T. M. (2019). Determining the continuous thermo-optic coefficients of chalcogenide glass thin films in the MIR region using FTIR transmission spectra. Optics Express, 27(16), 22275-22288. https://doi.org/10.1364/OE.27.022275

• Journal Article Type: Article
• Acceptance Date: Jun 19, 2019
• Online Publication Date: Jul 23, 2019
• Publication Date: Jul 23, 2019
• Deposit Date: Jul 12, 2019
• Publicly Available Date: Jul 12, 2019
• Journal: Optics Express
• Electronic ISSN: 1094-4087
• Publisher: Optical Society of America
• Peer Reviewed: Peer Reviewed
• Volume: 27
• Issue: 16
• Pages: 22275-22288
• DOI: https://doi.org/10.1364/OE.27.022275
• Keywords: Atomic and Molecular Physics, and Optics
• Public URL: https://nottingham-repository.worktribe.com/output/2302942
• Publisher URL: https://www.osapublishing.org/oe/abstract.cfm?uri=oe-27-16-22275
• Additional Information: This article is maintained by: OSA - The Optical Society; Crossref DOI link to publisher maintained version: https://doi.org/10.1364/OE.27.022275; Article type: research-article; Similarity check: Screened by Similarity Check; Peer reviewed: Yes; Review process: Single blind; Received: 9 April 2019; Accepted: 14 June 2019; Published: 23 July 2019; Copyright: Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.