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Control of spontaneous emission, which is one of the fundamental concepts in the field of quantum optics, has been reported using photonic crystals and microcavities through the Purcell effect. Increasing the photonic density of states (PDOS) is the key to enhancing the spontaneous emission from emitters which have a low quantum yield. There have been several reports on the enhancement of spontaneous...
In this paper photonic devices incorporating colloidal quantum dots are demonstrated. One-dimensional microcavity structure are fabricated using a combination of low temperature plasma enhanced chemical vapor deposition and spin coating. Enhancement in spontaneous emission from the CdSe/ZnS core/shell QDs embedded in the microcavity is demonstrated through steady state and time resolved luminescence...
We demonstrate holographic assembly of CdSe quantum dots in photopolymer films for fabricating 1D photonic lattice structures with diffraction efficiency near 100%. The nonlinear optical properties of the films are also investigated by z-scan techniques.
The two-photon excited fluorescence from CdSe/ZnS quantum dots on the surface of a two-dimensional SiN photonic crystal was investigated. With photonic crystal, the enhancement and the blue shift of two-photon excited fluorescence was observed.
Control over spontaneous emission of quantum dots is important for many applications, especially as light sources in photonic materials and nanostructures. Colloidal CdSe quantum dots have recently generated enormous interest because of the tunability of their emission energy with particle diameter over the entire visible range. The strength of the interaction of a quantum dot with the light field...
In this paper, the preparation of nanocomposites based on the incorporation of pre-synthesized (CdSe)ZnS core-shell luminescent nanocrystals (NCs) both in a PMMA (poly-methyl methacrylate) homo-polymer and into properly functionalized PMMA co-polymers is discussed. By using this novel luminescent nanocomposite materials, 2D photonic crystals are fabricated by Nanoimprint Lithography (NIL) and characterized,...
A new platform for fluorescence enhancement incorporating photonic crystal slabs is demonstrated. Fluorescence enhancement occurs by the effect of leaky eigenmodes that serve to enhance near-field intensities and simultaneously provide enhanced extraction.
We show that very high-efficiency second- and third- harmonic conversions can be generated simultaneously in 1-D semiconductor photonic crystals that possess both chi(2) and chi(3) nonlinearities. This is theoretically demonstrated in a CdS-SiO2 photonic crystal. The total conversion efficiency can be as large as ~30% for both second- and third-harmonic generations in a small sample with ~14 mum thickness...
We combine chemically-synthesized single nanowire emitters with lithographically-defined photonic crystal structures. Localized emission from engineered defects and light suppression in regions of the photonic crystal are demonstrated by photoluminescence imaging and spectroscopy measurements.
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