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Opt Express. 2011 Jun 20;19(13):12480-9. doi: 10.1364/OE.19.012480.

Selective tuning of high-Q silicon photonic crystal nanocavities via laser-assisted local oxidation.

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  • 1Optical Nanostructures Laboratory, Columbia University, New York 10027, USA. cww2104@columbia.edu


We examine the cavity resonance tuning of high-Q silicon photonic crystal heterostructures by localized laser-assisted thermal oxidation using a 532 nm continuous wave laser focused to a 2.5 μm radius spot-size. The total shift is consistent with the parabolic rate law. A tuning range of up to 8.7 nm is achieved with ∼ 30 mW laser powers. Over this tuning range, the cavity Qs decreases from 3.2×10(5) to 1.2×10(5). Numerical simulations model the temperature distributions in the silicon photonic crystal membrane and the cavity resonance shift from oxidation.

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