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Optical self heating?
Posted Apr 20, 2020, 11:27 a.m. EDT Electromagnetic Heating, Semiconductor Devices, Wave Optics Version 5.5 1 Reply
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Hello everybody,
is it possible to model optical self heating in COMSOL? Currently I'm trying to simulate a silicon photonic ring resonator/modulator using the wave optics module. The resonance of such a device is very sensitive to temperature and measurements show that optical self heating plays an important role in its characteristics. So if the ring is resonant, significant optical power couples into the ring and heats it up due to absorption. This detunes the ring. If the ring is excited slightly off the resonance, it depends on to which side you are off, because on the one side, heating the ring results in even worse resonance or to the other side in a better resonance, shifting the resonance more to the excitation wavelength, resulting in better coupling, resulting in more absorption, resulting in higher temperature, back to the beginning... Unfortunately I don't know, which physical interfaces I have to use to model this behaviour and how to put them together. Could anybody help me?
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Dear Marc,
You can simulate a bi-directional interaction of an optical field and heat transfer in COMSOL, yes. The “Laser Heating” multiphysics interface is a pre-defined coupling between “Heat Transfer in Solids” and the “Electromagnetic Waves, Beam Envelopes” interface which could be useful in your case. The latter interface can be used if you have a defined direction of propagation which is probably the case in a ring resonator. Check out this tutorial model: https://www.comsol.de/model/optical-ring-resonator-notch-filter-22221
Make sure to choose a study type which computes both interfaces at the same time, namely the “Frequency-Stationary” or the “Frequency-Transient” studies.
Feel free to also get in touch with us at support@comsol.com
Regards, Andreas