Advanced Materials

Amplified Spontaneous Emission in Semiconductor-Nanocrystal/Synthetic-Opal Composites: Optical-Gain Enhancement via a Photonic Crystal Pseudogap


  • This work was supported by the Chemical Sciences, Biosciences, and Geosciences Division of the Office of Basic Energy Sciences, Office of Science, U.S. Department of Energy and Los Alamos LDRD Funds.


Novel materials consisting of titania sol–gel/CdSe- or PbSe-nanocrystal (NC) nanocomposites infiltrated into polystyrene opal photonic crystals (PCs) are presented (see Figure). These composites exhibit efficient amplified spontaneous emission at decreased thresholds relative to the reference sol–gel/NC materials, despite the lower volume loading of NCs in the photonic structures. This work points toward tunable NC/PC lasers that can benefit from the easy manipulation of NC emission properties and PC band positions.

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