Abstract

We experimentally investigate and compare the thermo-optic effects of silicon carbide (SiC) and silicon (Si) photonic crystal nanocavities on their resonant wavelengths over a temperature range of $25°\mathrm{C}$ to nearly $200°\mathrm{C}$ by using a laser source with a wavelength close to the telecommunication wavelength range of $1550\mathrm{nm}$. The measured results clearly show that the shift in the resonant wavelength of the SiC cavity is significantly (by a factor of 3) less than that of the Si cavity for the same ambient temperature changes. In addition, the measured results provide direct estimates of the thermo-optic coefficients ($dn/dT$) for thin SiC and Si as $3.87\times {10}^{-5}/°\mathrm{C}$ and $1.60\times {10}^{-4}/°\mathrm{C}$, respectively, for this temperature range.

© 2011 Optical Society of America

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