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Photonic and Thermal Modelling of Microrings in Silicon, Diamond and GaN for Temperature Sensing

AuthorsWeituschat, Lukas Max; Dickmann, Walter; Guimbao, Joaquín; Ramos Vega, Daniel ; Kroker, Stefanie; Postigo, Pablo Aitor
Optical ring resonator
Gallium nitride
Temperature sensor
Thermal modelling
Two-photon absorption
Issue Date2020
PublisherMultidisciplinary Digital Publishing Institute
CitationNanomaterials 10(5): 934 (2020)
AbstractStaying in control of delicate processes in the evermore emerging field of micro, nano and quantum-technologies requires suitable devices to measure temperature and temperature flows with high thermal and spatial resolution. In this work, we design optical microring resonators (ORRs) made of different materials (silicon, diamond and gallium nitride) and simulate their temperature behavior using several finite-element methods. We predict the resonance frequencies of the designed devices and their temperature-induced shift (16.8 pm K−1 for diamond, 68.2 pm K−1 for silicon and 30.4 pm K−1 for GaN). In addition, the influence of two-photon-absorption (TPA) and the associated self-heating on the accuracy of the temperature measurement is analysed. The results show that owing to the absence of intrinsic TPA-processes self-heating at resonance is less critical in diamond and GaN than in silicon, with the threshold intensity Ith=α/β , α and β being the linear and quadratic absorption coefficients, respectively.
Description© 2020 by the authors.
Publisher version (URL)https://doi.org/10.3390/nano10050934
Appears in Collections:(IMN-CNM) Artículos
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