Supercontinuum-driven broadband Fourier-transform photothermal microspectroscopy
Abstract
Chemical characterization of microscopic samples often requires resolving multiple, widely separated vibrational absorption bands, including their positions and spectral shapes. Photothermal microspectroscopy provides a route to localized vibrational measurements by detecting absorption-induced thermal responses with a separate optical probe. However, rapid acquisition of broadband photothermal spectra remains challenging when spectral information is collected through sequential wavelength tuning. Here, we develop a supercontinuum (SC)-driven Fourier-transform photothermal (FT-PT) microspectroscopy platform that combines broadband near-infrared excitation with rapid-scan interferometric acquisition for localized vibrational measurements. In this approach, an interferometrically modulated SC pump induces wavelength-dependent photothermal responses in the sample, which are detected through a co-propagating visible probe beam and reconstructed by Fourier transformation. Using a 1.65-2.35 um spectral window, we demonstrate broadband photothermal spectra of aqueous samples with acquisition rates of approximately one spectrum per second. The system simultaneously resolves multiple molecular absorption features in a water-dimethyl sulfoxide mixture and reproduces the near-infrared absorption characteristics of liquid water with high spectral fidelity. Extending beyond homogeneous liquids, a dark-field detection configuration enables broadband photothermal spectroscopy of an individual 6 um polystyrene particle in an aqueous environment. This SC-based FT-PT microspectroscopy approach provides a rapid and broadband platform for localized vibrational characterization of liquid and microscopic samples, enabling chemical analysis with microscale spatial selectivity.
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BibTeX
@misc{wang2026supercontinuumdriven,
title = {{Supercontinuum-driven broadband Fourier-transform photothermal microspectroscopy}},
author = {Senyu Wang and Zicong Xu and Kazuki Hashimoto and Jianfeng Li and Takuro Ideguchi},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.32718},
eprint = {2610.32718},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.32718},
}
RIS
TY - UNPB
TI - Supercontinuum-driven broadband Fourier-transform photothermal microspectroscopy
AU - Senyu Wang
AU - Zicong Xu
AU - Kazuki Hashimoto
AU - Jianfeng Li
AU - Takuro Ideguchi
PY - 2026
DA - 2026/10/23
PB - arXiv
DO - 10.48550/arxiv.2610.32718
UR - https://arxiv.org/abs/2610.32718
AB - Chemical characterization of microscopic samples often requires resolving multiple, widely separated vibrational absorption bands, including their positions and spectral shapes. Photothermal microspectroscopy provides a route to localized vibrational measurements by detecting absorption-induced thermal responses with a separate optical probe. However, rapid acquisition of broadband photothermal spectra remains challenging when spectral information is collected through sequential wavelength tuning. Here, we develop a supercontinuum (SC)-driven Fourier-transform photothermal (FT-PT) microspectroscopy platform that combines broadband near-infrared excitation with rapid-scan interferometric acquisition for localized vibrational measurements. In this approach, an interferometrically modulated SC pump induces wavelength-dependent photothermal responses in the sample, which are detected through a co-propagating visible probe beam and reconstructed by Fourier transformation. Using a 1.65-2.35 um spectral window, we demonstrate broadband photothermal spectra of aqueous samples with acquisition rates of approximately one spectrum per second. The system simultaneously resolves multiple molecular absorption features in a water-dimethyl sulfoxide mixture and reproduces the near-infrared absorption characteristics of liquid water with high spectral fidelity. Extending beyond homogeneous liquids, a dark-field detection configuration enables broadband photothermal spectroscopy of an individual 6 um polystyrene particle in an aqueous environment. This SC-based FT-PT microspectroscopy approach provides a rapid and broadband platform for localized vibrational characterization of liquid and microscopic samples, enabling chemical analysis with microscale spatial selectivity.
ER -