Lithographic positioning of fluorescent molecules on high-Q photonic crystal cavities

Photoluminescent molecules are coupled to high quality photonic crystal nanocavities. The cavities are fabricated in a gallium phosphide membrane and show resonances from 735 to 860 nm with quality factors up to 12 000. The molecules, which are dispersed in a thin polymer film deposited on top of the cavities, can be selectively positioned onto the location of the cavity by using a lithographic technique, which is easily scalable to arrays of cavities.

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