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  • Volume 54, Issue 08
  • Volume 54, Issue 08

    More content from Volume 54, Issue 08

    Eric Proctor, William Parks, Benjamin S. Riggan/U.S. Army Research Laboratory
    Thermal imaging and deep neural networks combine in a thermal-to-visible, nighttime facial recognition system that is interoperable with visible-light-based facial recognition systems.
    Facial recognition continues to be challenging, but is advancing in large part because of specialized software algorithms that take clues from the surrounding environment for ...
    Aug. 1, 2018
    (Image credit: Jarrahi Research Group/UCLA)
    An optical photodiode made of gold-patched graphene nanostripes operates across a broad range of wavelengths and has a speed of 50 GHz.
    Conventional semiconductor photodiode materials (silicon, indium gallium arsenide, mercury cadmium telluride, and so on), while extremely useful in photonics, have sensitivities...
    Aug. 1, 2018
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    Optical isolators—components that transmit light in only one direction and block it in another—are crucial for protecting laser sources from back reflections and/or routing or...
    Aug. 1, 2018
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    Only by understanding limitations of plasmonic polariton confinement within materials like graphene can future nanophotonic engineering be improved.
    Aug. 1, 2018
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    Using an interferometer to characterize the spatial information of a continuous-wave (CW) laser beam can be done straightforwardly using a shearing interferometer, where the test...
    Aug. 1, 2018
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    It is widely believed that photonic crystals demonstrate transparency (the ability to transmit light without scattering or diffraction) only when the considered wavelength is ...
    Aug. 1, 2018
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    To date, underwater optical communications using blue or blue-green lasers or LEDs are considered optimal to achieve high bandwidth and high data transmission rate.
    Aug. 1, 2018
    Susan Reiss 720
    Congressional negotiations over the FY2019 budget look promising for bio-optics technologies that stretch the edges of discovery for personalized medicine, neuroscience, biosensing...
    Aug. 1, 2018
    Conard Holton2
    Light is an invaluable tool for very diverse applications, but none more so than sensing. And sensing with multiple wavelengths takes many forms—for example, tunable diode laser...
    Aug. 1, 2018
    FIGURE 1. The basic principle of a Fabry-Perot interference filter is detailed.
    Spectral unmixing and other image processing techniques applied to hyperspectral data reveal subtle color and texture differences not seen in standard microscopy images, improving...
    Aug. 1, 2018
    FIGURE 1. Three-dimensional shape sensing promises to facilitate procedures such as coronary angioplasty with highly accurate GPS-like guidance provided by feedback from the optical fiber, which exhibits strain when bent; this application is enabled by a highly complex optical fiber such as the spun seven-core SM-7C 1500(6.1/125).
    Leading-edge manufacturing processes have enabled the production of optical fibers robust and flexible enough to address an exciting new range of biomedical applications.
    Aug. 1, 2018
    FIGURE 1. Detector sensitivity vs. wavelength for silicon (Si) and InGaAs photodiodes.
    Here, in detail, are the lasers that can be used for Raman spectroscopy and why.
    Aug. 1, 2018
    FIGURE 1. Light propagates clockwise (dashed line) and counterclockwise (solid line) along the edge of a circle, which is also rotating.
    Rotation effects on laser ring gyroscopes and other rotating optical devices can now be straightforwardly modeled.
    Aug. 1, 2018