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Opt Lett. 2011 Jun 1;36(11):2110-2. doi: 10.1364/OL.36.002110.

Temperature-independent silicon subwavelength grating waveguides.

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  • 1Institute for Microstructural Sciences, National Research Council Canada, Ottawa, Ontario K1A 0R6, Canada. jens.schmid@nrc‐


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 nm is 1.8×10(-6) 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.

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