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    • Volume 54, Issue 09

    More content from Volume 54, Issue 09

    (Image credit: NIST)
    A schematic diagram shows spectral combination of the integrated devices and the frequency chain that multiplies the 10 MHz clock to the optical domain (a). Also shown is the combined spectrum of the 22 GHz microcomb with the III-V tunable laser in the communications C-band (b), as well as the combined spectrum of the octave-spanning silicon-nitride microcomb and the 22 GHz comb measured with an optical spectrum analyzer (c).
    Optical frequency combs and integrated photonics convert the output from a tunable laser into an on-demand, frequency-stabilized optical output.
    Sept. 2, 2018
    Refractive index vs. temperature was measured for the various amorphous polyimides; for example, the BTDT polyimide (a) and linear least-squares lines fit to the data. The volume coefficient of thermal expansion (VCTE) vs. 1/m* (where m* is the molecular weight) was calculated from the data for the various polyimides (b) and the results (colored dots) compared to data (open black dots) from a 2017 study of on crystalline polyimides done by Ishige et al [2]. The VCTE for the amorphous polyimides is significantly lower than those for the crystalline polyimides.
    Amorphous polyimides have thermo-optic coefficients and volume coefficients of thermal expansion much lower than the widely used PMMA and polycarbonate polymers used in optics...
    Sept. 1, 2018
    Conard Holton2
    Continuing a long tradition of technical excellence, the editorial team at Laser Focus World welcomes new editor in chief John Lewis.
    Sept. 1, 2018
    (Image credit: LioniX International, University of Athens, and West Attica)
    A conceptual illustration of the free-space optical (FSO) transceiver for intra-datacenter interconnects is shown (a), whereby the exiting beam can be configured to connect to other racks (b) via vertical or horizontal (2D) beam steering, thus enabling inter-rack communication architectures.
    The cabling complexity and high power consumption of traditional fiber-to-fiber optical interconnects and transceivers can be remedied using FSO interconnects and 2D beam steering...
    Sept. 1, 2018
    A laser diode coupled to an interferometer and other components on a silicon-on-insulator chip produces quantum-generated random numbers.
    Sept. 1, 2018
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    To optimize wireless power delivery using lasers and photovoltaics, the temperature and beam density must also be studied rather than output characteristics only.
    Sept. 1, 2018
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    By depositing the color filter directly on the silicon substrate, reducing the distance to the light-emitting layer, the Sony microdisplay has improved viewing angle and resolution...
    Sept. 1, 2018
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    A solar-blind photodetector is composed of nanocrystals of gallium oxide, a promising semiconductor for deep-UV detection.
    Sept. 1, 2018
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    Only by understanding limitations of plasmonic polariton confinement within materials like graphene can future nanophotonic engineering be improved.
    Sept. 1, 2018
    1304qa Chang New
    Analyze potential job offers at startup companies by understanding the company’s financial goals, the short- and long-term potential of the product or application, and whether...
    Sept. 1, 2018
    FIGURE 1. Shown is measured permittivity of ITO thin films fabricated with different temperatures during RF sputtering; carrier concentration and thus ENZ wavelength can be routinely designed. The Drude model (red curves) describes the permittivity as a function of wavelength.
    Ultrathin, tunable conducting oxide nanolayers have many potential applications in flat nonlinear and magneto-optical devices, tunable metamaterial devices, and quantum zero-index...
    Sept. 1, 2018
    FIGURE 1. A >0.3 mm glass wafer with isotropically etched channels is bonded with room-temperature UV adhesive to a 1-mm-thick glass wafer; the glass:glass bond preserves bioactivity of encapsulated biomolecules/cells.
    Microfluidics is an enabling technology that requires robust material for peak performance.
    Sept. 1, 2018
    FIGURE 1. A schematic shows a simple HOM interferometer used to measure the effects of a photon’s spatial properties on its group velocity; such interferometers were used by Giovannini et al. and Lyons et al. The inset shows an example of a HOM interference dip (blue) with corresponding Fisher information distribution (red).
    Measurement of optical path thickness down to 1 nm is possible using Hong-Ou-Mandel interferometry, improving characterization of multilayer samples.
    Sept. 1, 2018