We report our work on nanophotonic devices and the associated fabrication processes, mostly based on the top-down and bottom-up integration of photonic crystal on silicon and other foreign substrates. Encapsulated photonic crystals were proposed based on the integration of nanoparticles with patterned photonic crystals. Infrared photodetectors based the hybrid integration of quantum dots and photonic crystal cavities will be discussed for spectrally-selective absorption enhancement. We will also report other collaborative work on ultra-compact filters/detectors on Si, based on the top down lithographic patterning and bottom up stacking processes of nanomembranes. These heterogeneous integration processes for dissimilar materials systems hold great promises for nanophotonic devices and flexible photonic system integrations, suitable for applications ranging from optical interconnect systems and silicon photonics, to infrared sensing and flexible displays.

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