集成TMDC的超高Q微腔中的定量腔增强光热动力学
Quantitative cavity-enhanced photothermal dynamics in TMDC-integrated ultrahigh-Q microcavities
AI总结：
该研究探究了集成TMDC的超高Q微腔的光热效应，建立了定量模型，揭示了PL特性差异，为相关混合系统的光热研究及器件热态控制提供了方法。
摘要：
我们研究了集成有超高Q二氧化硅微腔的单层过渡金属二硫化物（TMDCs）中的光热效应。将连续波激光注入腔共振可实现受控的腔内加热，从而直接观察到激子光致发光（PL）调制。当泵浦波长在共振范围内调谐时，观察到PL峰能量出现明显红移。这种行为可通过结合Varshni关系与微腔热光响应的温度依赖带隙模型进行定量重现，据此可估算局部温升。我们进一步发现，通过光纤波导收集的PL呈现出与自由空间发射显著不同的光谱和时间特性，表明微腔对特定激子通道存在选择性耦合。这些结果为理解TMDC-微腔混合系统中的光热效应提供了定量框架，并为集成纳米光子器件中热态的全光控制与探测提供了通用方法。
英文摘要：
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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