We demonstrate athermal amorphous Si (a-Si) ring resonators using a top polymer cladding. We observe near complete thermo-optic (TO) compensation, and a temperature dependent resonant wavelength shift (TDWS) as low as 0.5 pm/K is achieved.

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Conference Integrated Photonics Research, Silicon and Nanophotonics, IPRSN 2010
Raghunathan, V. (Vivek), Hu, J. (Juejun), Michel, J. (Jurgen), Kimerling, L.C. (Lionel C.), & Ye, W.N. (2010). Athermal silicon ring resonators. In Optics InfoBase Conference Papers.