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12 September 2011 Thermal tuning of a silicon photonic crystal cavity infilled with an elastomer
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Thermal tuning of the transmission of an elastomer infilled photonic crystal cavity is studied. An elastomer has a thermal expansion-induced negative thermo-optic coefficient that leads to a strong decrease of the refractive index upon heating. This property makes elastomer highly suitable for thermal tuning of the transmission of a cavity, which is demonstrated by global infilling of a hole-type silicon photonic crystal slab and global thermal tuning. In the temperature range 20-60 0C the cavity peak shows a pronounced elastomer-induced blue shift of 2.7 nm, which amply overcompensates the red shift arising from the thermo-optic property of the silicon. These results qualify the elastomer for tuning by local optical heating.
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A. Koray Erdamar, Matheus M. van Leest, Stephen J. Picken, and J. Caro "Thermal tuning of a silicon photonic crystal cavity infilled with an elastomer", Proc. SPIE 8095, Active Photonic Materials IV, 80951J (12 September 2011);

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