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Conventional ternary chalcogenide phase change materials (PCMs) have been widely used for near-infrared to mid-infrared applications but typically exhibit only two phases. In contrast, antimony sulfide (Sb2S3) is a binary phase-change material that can take three states and consists of earth-abundant elements. Despite its potential as a new class of PCM, Sb2S3 remains relatively underexplored. In the current work, we employ Raman spectroscopy and nano-FTIR to investigate phase transitions of Sb2S3 induced by femtosecond-pulsed and continuous-wave lasers. In particular, nano-FTIR enables nanoscale characterization of reversible phase transitions and clear identification of the typically elusive intermediate state. By integrating nano-FTIR and Raman spectroscopy, we correlate morphological and chemical features with optical responses. Crucially, the nano-FTIR amplitude distributions under broadband excitation are governed not only by the magnitude of the dielectric constant but also by the sensing depths. This work advances the understanding and application of binary chalcogenide PCMs for mid-infrared photonic devices.

Rights:

• Creative Commons BY-NC Attribution-NonCommercial 4.0 International
  

Keyword: Antimony trisulfide, Infrared spectroscopy, Phase change material, FTIR

Date published: 2026-05-14

Publisher: Elsevier BV

Journal:

• Applied Surface Science Advances (ISSN: 26665239) vol. 34 101000

Funding:

• JST JPMJFR2139
• National Science and Technology Council NSTC 112–2223-E-007-007-MY3; 114–2112-M-007–037

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1016/j.apsadv.2026.101000

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Updated at: 2026-07-02 09:00:18 +0900

Published on MDR: 2026-07-02 10:29:00 +0900