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Opt Lett. 2007 Mar 1;32(5):542-4.

High-Q cavities in photosensitive photonic crystals.

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ARC Centre of Excellence for Ultrahigh-Bandwidth Devices for Optical Systems (CUDOS), School of Physics, University of Sydney, New South Wales 2006, Australia.


We propose a novel concept for creating high-Q cavities in photonic crystal slabs (PCSs) composed of photosensitive material. To date, high-Q cavities have been realized through the use of double heterostructures where the lattice geometry is altered via nanolithography. Here, we show that selective postexposure to light of a uniform PCS composed of photosensitive material, altering the refractive index permanently, can also yield high-Q microcavities. We show theoretically that high-Q cavities (up to Q = 1 x 10(6)) can be achieved with photoinduced index changes that are well within what can be achieved in chalcogenide glasses.

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