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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