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Plasmonic Resonances Found in QDs

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BERKELEY, Calif., April 25, 2011 — Until now plasmonic properties have been limited to nanostructures that feature interfaces between noble metals and dielectrics. Now researchers have discovered that plasmonic properties can also be achieved in quantum dots. "We have demonstrated well-defined localized surface plasmon resonances arising from p-type carriers in vacancy-doped semiconductor quantum dots that should allow for plasmonic sensing and manipulation of solid-state processes in single nanocrystals," said Paul Alivisatos, director at the US Department of Energy (DoE)'s Lawrence Berkeley National Laboratory...Read full article

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    Published: April 2011
    Glossary
    nano
    An SI prefix meaning one billionth (10-9). Nano can also be used to indicate the study of atoms, molecules and other structures and particles on the nanometer scale. Nano-optics (also referred to as nanophotonics), for example, is the study of how light and light-matter interactions behave on the nanometer scale. See nanophotonics.
    photon
    A quantum of electromagnetic energy of a single mode; i.e., a single wavelength, direction and polarization. As a unit of energy, each photon equals hn, h being Planck's constant and n, the frequency of the propagating electromagnetic wave. The momentum of the photon in the direction of propagation is hn/c, c being the speed of light.
    photonics
    The technology of generating and harnessing light and other forms of radiant energy whose quantum unit is the photon. The science includes light emission, transmission, deflection, amplification and detection by optical components and instruments, lasers and other light sources, fiber optics, electro-optical instrumentation, related hardware and electronics, and sophisticated systems. The range of applications of photonics extends from energy generation to detection to communications and...
    plasmonics
    Plasmonics is a field of science and technology that focuses on the interaction between electromagnetic radiation and free electrons in a metal or semiconductor at the nanoscale. Specifically, plasmonics deals with the collective oscillations of these free electrons, known as surface plasmons, which can confine and manipulate light on the nanometer scale. Surface plasmons are formed when incident photons couple with the conduction electrons at the interface between a metal or semiconductor...
    quantum dots
    A quantum dot is a nanoscale semiconductor structure, typically composed of materials like cadmium selenide or indium arsenide, that exhibits unique quantum mechanical properties. These properties arise from the confinement of electrons within the dot, leading to discrete energy levels, or "quantization" of energy, similar to the behavior of individual atoms or molecules. Quantum dots have a size on the order of a few nanometers and can emit or absorb photons (light) with precise wavelengths,...
    Americasartificial photosynthesisBasic ScienceBerkeley Labcopper sulfide nanocrystalsdielectricsenergyJoseph LutherLight Sourceslocalized surface plasmon resonanceMicroscopynanonanocrystalsnoble metalsp-type carriersPaul AlivisatosphotonphotonicsphotovoltaicsplasmonicsPrashant Jainquantum dotsResearch & TechnologySensors & Detectorssolar spectrumstoichiometriesTrevor EwersUS Department of Energyvacancy-doped semiconductor quantum dotsLEDs

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