Structure-terahertz property relationship and femtosecond laser irradiation effects in chalcogenide glasses
Nicholas Tostanoski, Edwin J. Heilweil, Peter Wachtel, David Musgraves, S. K. Sundaram
We report structure-terahertz property relationship for various non-oxide chalcogenide glasses including unary (vitreous selenium (Se)), binary (arsenic sulfide (As-S), arsenic selenide (As-Se), and germanium selenide (Ge-Se)), and ternary (germanium arsenic selenide (Ge-As-Se)), systems along with commercially available AMTIR-1, IRG 22, and IRG 24 Ge-As-Se glasses. This comprehensive study is the first of its kind to combine Raman spectroscopy to examine structural units, connectivity, and glass network and terahertz time-domain spectroscopy (THz-TDS) to record the THz refractive index, n(THz), across a broad THz bandwidth. THz-TDS was carried out at Alfred University (AU) and National Institute of Standards and Technology (NIST), ultimately providing confidence in n(THz) values measured at AU. Low-repetition rate femtosecond laser irradiation (1 KHz, 40 fs, and 70 mW) was used to modify As-S and As-Se glass systems, where Raman and THz-TDS were used to observe structural and n(THz) changes. Long-wave infrared (LWIR) (e.g., 10 μm)-THz (e.g., 1.0 THz) refractive index correlation is presented for all binary and ternary studied chalcogenide glasses. Such a correlation is valuable for predicting and designing chalcogenide glasses for integrated optical applications across THz and IR regions.
, Heilweil, E.
, Wachtel, P.
, Musgraves, D.
and Sundaram, S.
Structure-terahertz property relationship and femtosecond laser irradiation effects in chalcogenide glasses, Journal of Non-Crystalline Solids, [online], https://doi.org/10.1016/j.jnoncrysol.2022.122020, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=935277
(Accessed December 1, 2023)