A simple method for characterizing and engineering thermal relaxation of an optical microcavity
A simple method for characterizing and engineering thermal relaxation of an optical microcavity
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DOI：
10.1063/1.4960665
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发表时间：
2016-08-08
影响因子：
4
通讯作者：
Yang, Lan
中科院分区：
文献类型：
--
作者：
Chen, Weijian;Zhu, Jiangang;Yang, Lan
光子谐振腔的热特性不仅取决于材料的热光系数等本征性质，还取决于谐振腔的几何形状和结构。用于表征和测量单个光子谐振器的热特性的技术将有益于许多应用。在这项工作中，我们提出了一种方法来光学测量的热弛豫时间和有效热导的回音壁模式微腔利用光热效应。通过对腔内两个邻近的光模进行光学探测，分析了光热效应引起的透射谱变化，从而定量分析了腔体的热弛豫过程。我们表明，有效热导可以从实验上推导出的热弛豫测量，它可以通过改变腔的几何参数进行定制。实验观察结果与建议的分析模型吻合得很好。该方法可以应用于不同形式的各种谐振器。出版社：AIP Publishing
Thermal properties of a photonic resonator are determined not only by intrinsic properties of materials, such as thermo-optic coefficient, but also by the geometry and structure of the resonator. Techniques for characterization and measurement of thermal properties of individual photonic resonator will benefit numerous applications. In this work, we demonstrate a method to optically measure the thermal relaxation time and effective thermal conductance of a whispering gallery mode microcavity using optothermal effect. Two nearby optical modes within the cavity are optically probed, which allows us to quantify the thermal relaxation process of the cavity by analyzing changes in the transmission spectra induced by optothermal effect. We show that the effective thermal conductance can be experimentally deduced from the thermal relaxation measurement, and it can be tailored by changing the geometric parameters of the cavity. The experimental observations are in good agreement with the proposed analytical modeling. This method can be applied to various resonators in different forms. Published by AIP Publishing.