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Updated: May 13, 2026

Fabrication and Testing of Photonic Thermometers
Published on: October 24, 2018
The influence of substrate on SOI photonic crystal thermo-optic devices
Weiwei Song1, Manjit Chahal, George K Celler
1Department of Electrical and Computer Engineering, Rutgers University, Piscataway, NJ 08854, USA.
Abstract:
We investigate the influence of the substrate on a photonic crystal thermo-optic device on a silicon-on-insulator (SOI) platform. The substrate-induced thermo-optic tuning is obtained as a function of key physical parameters, based on a semi-analytic theory that agrees well with numeric simulations. It is shown that for some devices, the substrate's contribution to the thermo-optic tuning can exceed 10% for a heater located in the waveguide core and much higher for some other configurations. The slow response of the substrate may also significantly slow down the overall response time of the device. Strategies of minimizing the substrate's influence are discussed.
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