Abstract

LiNbO₃ crystals are already widely used for THz application [1]. The main drawback of using this material is represented by its high absorbance in this electromagnetic wavelength range [2]. In this work, we propose to exploit its high absorbance for thermal conversion of the incident wave. By means of the high sensitivity to temperature variations of WGM resonators, it would be possible to convert absorbed power in a thermal shift of the resonance. In our model, the microdisc is represented in a mono-dimensional picture as a h=1 mm thick slab between a perfect insulator (air, with thermal conductivity k=0) and a perfect heat sink (k=0) that acts as mirror for the THz radiation. Under this conditions, the time constant could be written as

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