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QD method combines best of optical, electron microscopy

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Ashley N. Rice, [email protected]

A fast, versatile and high-resolution technique that combines the best of optical and scanning electron microscopy could provide surface and subsurface viewing of features as small as 10 nm in size. This will be useful for a wide range of applications including materials characterization and the life sciences, its creators say. Researchers at NIST have developed the microscopy method using cathodoluminescence to image nanoscale features. In an old tube television, a beam of electrons moves over a phosphor screen to create images; the new technique works in much the same way by scanning a...Read full article

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    Published: September 2013
    Glossary
    cathodoluminescence
    Light produced when a metal is bombarded with high-velocity electrons causing small amounts of the metal to vaporize and emit radiation. Also known as electronoluminescence.
    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.
    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,...
    scanning electron microscopy
    Scanning electron microscopy (SEM) is an advanced imaging technique used in microscopy to obtain high-resolution, three-dimensional images of the surfaces of solid specimens. SEM achieves this by using a focused beam of electrons to scan the specimen's surface, resulting in detailed images with magnifications ranging from about 10x to 100,000x or higher. Key features and principles of scanning electron microscopy include: Electron beam: SEM uses an electron beam instead of visible light for...
    AmericasBiophotonicsBioScancathodoluminescenceConsumerHeayoung YoonImagingMarylandMaryland NanoCenternanoNational Institute of Standards and TechnologyNewsNikolai ZhitenevNISToptical microscopyOpticsQD Visionquantum dotsSandia National Laboratoriesscanning electron microscopyUniversity of MarylandWorcester Polytechnic Institute

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