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Electrons in QDs seen absorbing, emitting light

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The special energy states of electrons confined in quantum dots have been observed for the first time, a feat that could help exploit the unique properties of the nanoscale semiconductor materials for technological applications. Because they are easy to synthesize and their behavior is akin to that of single atoms, quantum dots are generally considered to hold great potential for technological applications. But to take advantage of these properties, scientists must first understand how the electrons trapped inside quantum dots absorb energy and emit it again as light. There are...Read full article

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    Published: December 2012
    Glossary
    collimation
    1. The process of aligning the optical axes of optical systems to the reference mechanical axes or surfaces of an instrument. 2. The adjustment of two or more optical axes with respect to each other. 3. The process by which a divergent beam of radiation or particles is converted into a parallel beam.
    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.
    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...
    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,...
    collimationelectron trappingelectronsEuropefree electron laserHelmholtz-Zentrum Dresden-RossendorfHZDRIFWImagingLeibniz Institute for Solid State and Materials Research DresdenlensesMicroscopymirrorsnanonanopyramidsOpticsphotonicsquantum dotsResearch & TechnologyScanning near-field microscopysemiconductor materialssingle quantum dotStephan WinnerlTech PulseTU DresdenLasers

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