Abstract

We demonstrate, by experiment and numerical calculations, temperature-independent subwavelength grating waveguides with a periodic composite core composed of alternating regions of silicon and SU-8 polymer. The polymer has a negative thermo-optic (TO) material coefficient that cancels the large positive TO effect of the silicon. Measurements and Bloch mode calculations were carried out over a range of silicon–polymer duty ratios. The lowest measured TO coefficient at a wavelength of $1550\mathrm{nm}$ is $1.8\times {10}^{-6}{\mathrm{K}}^{-1}$; 2 orders of magnitude smaller than a conventional silicon photonic wire waveguide. Calculations predict the possibility of complete cancellation of the silicon waveguide temperature dependence.

© 2011 Optical Society of America

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