2026/05/31 by Hidetoshi Kanzawa, Ryo Sugano, Hajime Kumazaki +4
Physics and Astronomy · #Dynamics (music) #Mechanical and Optical Resonators #Nonlinear optics #Photonic Crystals and Applications #Photothermal therapy #Raman scattering #Refractive index #Resonator #Strong Light-Matter Interactions #physics.optics
paper · pdf · doi:10.1364/ome.604640
9 pages; 5 figures
openalex publication_date 2026/07/31 · arxiv created 2026/08/01 · openalex created_date 2026/08/01 · openalex updated_date 2026/08/02 · arxiv updated 2026/08/04
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.