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Local tuning of photonic crystal cavities using chalcogenide glasses
Preprint
Andrei Faraon ,
Dirk Englund ,
Douglas Bulla ,
Barry Luther-Davies ,
Benjamin J. Eggleton ,
Nick Stoltz ,
Pierre Petroff ,
Jelena Vuckovic
05 November 2007
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Abstract
We demonstrate a method to locally change the refractive index in planar optical devices by photodarkening of a thin chalcogenide glass layer deposited on top of the device. The method is used to tune the resonance of GaAs-based photonic crystal cavities by up to 3 nm at 940 nm, with only 5% deterioration in cavity quality factor. The method has broad applications for postproduction tuning of photonic devices.