Modification of two-photon excited fluorescence from quantum dots on SiN photonic crystals

We investigate two-photon excited fluorescence from CdSe quantum dots with a center-emitting wavelength of 655 nm on SiN photonic crystals. We find that two-photon excited fluorescence is enhanced by more than 1 order of magnitude in the vertical direction when a photonic crystal is used compared to the fluorescence spectra in the absence of photonic crystals. The spectrum of two-photon excited fluorescence from quantum dots on SiN photonic crystal is observed to shift to blue compared to that from quantum dots on SiN without photonic crystals. (C) 2010 Optical Society of America

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National Natural Science Foundation of China (NSFC) 60537010 60877030 ;National High Technology Research and Development Program of China 2009AA03Z406

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National Natural Science Foundation of China (NSFC) 60537010 60877030 ;National High Technology Research and Development Program of China 2009AA03Z406