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arXiv · 2605.03316

Quantitative cavity-enhanced photothermal dynamics in TMDC-integrated ultrahigh-Q microcavities

Hidetoshi Kanzawa·Ryo Sugano·Hajime Kumazaki·Yuta Takahashi·Mayori Terada·Shinichi Watanabe·Shun Fujii
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Abstract

We investigate photothermal effects in monolayer transition metal dichalcogenides (TMDCs) integrated with an ultrahigh-Q silica microcavity. Launching a continuous-wave laser into a cavity resonance enables controlled intracavity heating, allowing direct observation of excitonic photoluminescence (PL) modulation. A distinct redshift of the PL peak energy is observed as the pump wavelength is tuned across resonance. This behavior is quantitatively reproduced by a temperature-dependent bandgap model that combines the Varshni relation with the thermo-optic response of the microcavity, from which the local temperature rise can be estimated. We further find that PL collected through a fiber waveguide exhibits spectral and temporal characteristics markedly different from free-space emission, indicating selective coupling of the microcavity to specific excitonic channels. These results provide a quantitative framework for understanding photothermal effects in TMDC-microcavity hybrid systems and offer a versatile approach for all-optical control and probing of thermal states in integrated nanophotonic devices.

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Hidetoshi Kanzawa, Ryo Sugano, Hajime Kumazaki, Yuta Takahashi, Mayori Terada, Shinichi Watanabe, Shun Fujii. 2026-05-05. Quantitative cavity-enhanced photothermal dynamics in TMDC-integrated ultrahigh-Q microcavities. https://arxiv.org/abs/2605.03316

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