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    • Volume 57, Issue 04

    More content from Volume 57, Issue 04

    FIGURE 1. Two-dimensional array of micromirrors with three possible angular positions: flat, tilted v degrees anticlockwise, and tilted +v degrees clockwise.
    Compact near-infrared spectrometers based on digital micromirror devices (DMDs) can be lower in cost than diode-array spectrometers while maintaining high stability.
    April 21, 2021
    FIGURE 1. Schematic of an edge coupler (a) and a grating coupler (b).
    Efficiently linking optical fibers to silicon photonics is crucial to high-volume deployment; a new monolithic 1:1 imaging coupler is compact and suitable for volume fabrication...
    April 21, 2021
    (Courtesy of the Catalan Institute of Nanoscience and Nanotechnology)
    A new interferometric sensor has demonstrated the ability to rapidly and accurately detect low levels of pathogenic bacteria in a compact point-of-care device.
    A bimodal waveguide sensor has a waveguide portion biochemically functionalized to bind to a specific target, allowing interferometric sensing of the target.
    April 21, 2021
    (Adapted from J. Knall et al. [1])
    A Yb-doped silica fiber is pumped with light at a wavelength ranging from 1020 to 1070 nm, causing anti-Stokes fluorescence that carries some energy away. Depending on the wavelength, enough energy can be carried away to exceed the amount of energy dumped into the fiber as heat, thus cooling the fiber. As can be seen, the optimum pump wavelength in the experiment was about 1040 nm.
    A ytterbium-doped silica fiber laser pumped with light at 1040 nm loses enough heat via anti-Stokes fluorescence to become athermal.
    April 21, 2021
    (Image credit: SIOM)
    For extreme-ultraviolet (EUV) lithographic systems in which the photomask needs to be optimized to minimize optical-proximity effects, a simultaneous source-mask optimization (SMO) algorithm using a thick-mask model results in more-accurate features printed at the wafer.
    A software algorithm based on social learning particle swarm optimization (SL-PSO) simultaneously optimizes source and mask for extreme-ultraviolet (EUV) lithography.
    April 21, 2021
    A resonance curve from two coupled microring resonators producing a microcomb is fit with a curve that models a resonance doublet.
    Using a laser with a milliwatts-level output, two linearly coupled microresonators produce a microcomb potentially widely useful in spectroscopy, communications, and other applications...
    April 21, 2021
    In a single-mode optical fiber with a 10-μm-diameter core, a high-refractive-index rod is placed a distance S away in the cladding; the rod itself supports a mode, in addition to the mode supported by the core (a). The idea is for the rod to couple resonantly to the core, drawing light in certain spectral regions away from the core and absorbing it, thus serving as a spectral filter. The width of the peak bandwidth narrowed as the rod was moved farther from the core (b).
    A single-mode silica fiber has a high-refractive-index rod placed in the cladding that resonates with the core, absorbing light at certain wavelengths.
    April 21, 2021
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    Confirmed by experiment, calculations show how deep light goes into a DBR mirror before it reflects; this is relevant for determining microcavity lengths.
    April 21, 2021
    (Image credit: Andrea Toulouse, Johannes Drozella, Simon Thiele, Harald Giessen, and Alois Herkommer)
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    A 3D-printed miniature spectrometer is so small that it can fit on the tip of an endoscope or on a miniature image sensor.
    April 21, 2021
    Accelerating a small chemical specimen to relativistic speeds slows down its “internal clock,” enabling higher temporal resolution for ultrafast studies.
    April 21, 2021
    (Courtesy of NASA)
    The global geologic map of Mars published by the U.S. Geological Survey in 2014; it combines information from four orbiting spacecraft that have been acquiring data for more than 16 years.
    The current missions to Mars are exciting to follow, and show the value of science and photonics as exploration and the search for life on another world put life on Earth in perspective...
    April 21, 2021
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    Technology advances now allow very fast delivery of high-repetition-rate, ultrashort-pulse light to large functional surfaces.
    April 21, 2021
    2104 Lfw Ils Reh 1
    Digital printing and laser processes replace the manual process steps of conventional bonding.
    April 21, 2021
    New Image 2
    It’s been a bit more than 12 months since U.S. cities began to shut down in response to the spreading COVID-19 virus.
    April 21, 2021
    (Photo 183113861 © Toodlingstudio | Dreamstime.com)
    Dreamstime M 183113861
    They likely will—find out how by viewing the Lasers & Photonics Marketplace Seminar Wrap Up Roundtable Discussion.
    April 2, 2021