Intrinsic temporal and spectral mixing in time-resolved terahertz spectroscopy

[2512.16713] Intrinsic temporal and spectral mixing in time-resolved terahertz spectroscopy Skip to main content Search Submit Donate Log in Physics > Optics arXiv:2512.16713 (physics) [Submitted on 18 Dec 2025] Title: Intrinsic temporal and spectral mixing in time-resolved terahertz spectroscopy Authors: Benjamin J. Dringoli , David G. Cooke View PDF HTML (experimental) Abstract: In an ultrafast optical-pump terahertz-probe measurement, the photoinduced material response can be modulated on a timescale shorter than the extent of the THz pulse. In this situation, the measured time-frequency response deviates from a simple time-dependent linear response. When full two-dimensional time-frequency maps are measured, this yields complex features that can be incorrectly assigned to a photoexcited coherent response. We investigate this experimentally via the measured response of photoexcited SnSe, whereby photoinduced phase change dynamics lead to ultrafast changes of the charge carrier and lattice optical conductivity response. Two-dimensional time-frequency THz transmission maps subsequently show unexpected time-frequency features at early pump-probe delay times. These features are reproduced in both finite-difference time-domain simulations of the THz experiment and in an extension of non-equilibrium response function theory, demonstrating their systematic origin. This work improves the understanding of systematic effects in high time resolution optical-pump THz-probe spectroscopy, and explores the conditions in which they are likely to appear. Comments: 14 pages (article and supplement), 5 and 5 figures respectively Subjects: Optics (physics.optics) ; Materials Science (cond-mat.mtrl-sci) Cite as: arXiv:2512.16713 [physics.optics] (or arXiv:2512.16713v1 [physics.optics] for this version) https://doi.org/10.48550/arXiv.2512.16713 Focus to learn more arXiv-issued DOI via DataCite Journal reference: Phys. Rev. B 114, 134308 (2026) Related DOI : https://doi.org/10.1103/j42q-yxgt Focus to learn more DOI(s) linking to related resources Submission history From: Benjamin Dringoli [ view email ] [v1] Thu, 18 Dec 2025 16:15:32 UTC (6,156 KB) Full-text links: Access Paper: View PDF HTML (experimental) TeX Source view license Current browse context: physics.optics < prev | next > new | recent | 2025-12 Change to browse by: cond-mat cond-mat.mtrl-sci physics References & Citations SciX Google Scholar Semantic Scholar export BibTeX citation Bookmark Bibliographic Tools Bibliographic and Citation Tools Bibliographic Explorer Toggle Bibliographic Explorer ( What is the Explorer? ) Connected Papers Toggle Connected Papers ( What is Connected Papers? ) Litmaps Toggle Litmaps ( What is Litmaps? ) scite.ai Toggle scite Smart Citations ( What are Smart Citations? ) Code, Data, Media Code, Data and Media Associated with this Article alphaXiv Toggle alphaXiv ( What is alphaXiv? ) Links to Code Toggle CatalyzeX Code Finder for Papers ( What is CatalyzeX? ) DagsHub Toggle DagsHub ( What is DagsHub? ) GotitPub Toggle Gotit.pub ( What is GotitPub? ) Huggingface Toggle Hugging Face ( What is Huggingface? ) ScienceCast Toggle ScienceCast ( What is ScienceCast? ) Demos Demos Replicate Toggle Replicate ( What is Replicate? ) Spaces Toggle Hugging Face Spaces ( What is Spaces? ) Spaces Toggle TXYZ.AI ( What is TXYZ.AI? ) Related Papers Recommenders and Search Tools Link to Influence Flower Influence Flower ( What are Influence Flowers? ) Core recommender toggle CORE Recommender ( What is CORE? ) Author Venue Institution Topic About arXivLabs arXivLabs: experimental projects with community collaborators arXivLabs is a framework that allows collaborators to develop and share new arXiv features directly on our website. Both individuals and organizations that work with arXivLabs have embraced and accepted our values of openness, community, excellence, and user data privacy. arXiv is committed to these values and only works with partners that adhere to them. Have an idea for a project that will add value for arXiv's community? Learn more about arXivLabs . Which authors of this paper are endorsers? | Disable MathJax ( What is MathJax? ) We gratefully acknowledge support from our major funders , member institutions , and all contributors. About · Help · Contact · Subscribe · Copyright · Privacy · Accessibility · Operational Status (opens in new tab) Major funding support from (opens in new tab) (opens in new tab) (opens in new tab)

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