Photonic and thermal modelling of microrings in silicon, diamond and GaN for temperature sensing

authored by
Lukas Max Weituschat, Walter Dickmann, Joaquín Guimbao, Daniel Ramos, Stefanie Kroker, Pablo Aitor Postigo
Abstract

Staying 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.

External Organisation(s)
Campus of International Excellence (CEI) UAM+CSIC
National Metrology Institute of Germany (PTB)
Technische Universität Braunschweig
Type
Article
Journal
Nanomaterials
Volume
10
ISSN
2079-4991
Publication date
05.2020
Publication status
Published
Peer reviewed
Yes
ASJC Scopus subject areas
Chemical Engineering(all), Materials Science(all)
Electronic version(s)
https://doi.org/10.3390/nano10050934 (Access: Open)