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

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

2011-06-03

arxiv.org/abs/1106.0705v1

Physics

Optics

12 pages, 7 figures

Scientific paper

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 mm 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 Q decreases from 3.2\times10^5 to 1.2\times10^5. Numerical simulations model the temperature distributions in the silicon photonic crystal membrane and the cavity resonance shift from oxidation.

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