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 1550nm 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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Persistent URL dx.doi.org/10.1364/OL.36.002110
Journal Optics Letters
Schmid, J.H. (J. H.), Ibrahim, M. (M.), Cheben, P. (P.), Lapointe, J. (J.), Janz, S. (S.), Bock, P.J. (P. J.), … Xu, D.-X. (D. X.). (2011). Temperature-independent silicon subwavelength grating waveguides. Optics Letters, 36(11), 2110–2112. doi:10.1364/OL.36.002110