• Back Issues >
  • Laser Focus World >
  • Volume 55, Issue 02

    • Volume 55, Issue 02

    More content from Volume 55, Issue 02

    (Image credit: 2019 Consumer Biometrics report, Yole Développement)
    FIGURE 1. The biometric hardware market has steadily evolved and gained market value.
    Fingerprint identification technology still dominates the biometric market, but big changes have come with 3D facial recognition and other photonics-based security applications...
    Feb. 1, 2019
    2105 Lfw Lpms Supp 9a
    Editor in chief John Lewis discusses SPIE Photonics West and invites you to enjoy Laser Focus World’s February 2019 issue which includes trends in photonics technologies, applications...
    Feb. 1, 2019
    (Courtesy of COMSOL)
    FIGURE 1. A Petzval lens, shown here in a ray diagram, includes (from left to right) a first focusing lens, the aperture stop, a second focusing lens, a field-flattening lens, and the image plane.
    Optical ray tracing software reveals temperature effects by performing a coupled analysis of a lens system’s structural, thermal, and optical performance.
    Feb. 1, 2019
    Shown is the experimental setup for an optomechanical time-domain reflectometry measurement of the characteristics of a medium placed outside the cladding of a standard single-mode optical fiber, thanks to optical-to-acoustic mixing of waves in a forward stimulated Brillouin scattering (F-SBS) mixing process.
    The interplay between light waves and ultrasound signals now enables fiber-optic sensing of materials outside the optical fiber that do not interact with its core.
    Feb. 1, 2019
    (Adapted from A.H. Fikouras et al. [1])
    Once internalized into a cell, a nanodisk laser is optically pumped by a microscope objective (blue). The same objective collects laser emission (red). The inset shows the calculated profile of the lowest radial order transverse electric (TE) mode for a 750-nm-diameter disk made of a GaInP/AlGaInP quantum-well structure.
    The smallest known lasers to date promise to help scientists better understand the mechanisms of disease, according to the researchers who developed them.
    Feb. 1, 2019
    (Image credit: University of Twente)
    An all-silicon intrachip optocoupler, made with standard CMOS techniques, is shown in this concept drawing. The round structure is the SPAD photodetector; the light source, an AMLED, has the shape of a horseshoe.
    Combining a silicon avalanche-mode LED with a single-photon avalanche diode allows an intrachip photonic optocoupler to be made with standard CMOS technology.
    Feb. 1, 2019
    (Image credit: University of Heidelberg)
    Ultrafine silica particles are trapped in bowtie nanoapertures, enhancing phonon resonances that improve detection and analysis using surface-enhanced infrared absorption (SEIRA) spectroscopy.
    Small silica particles can be easily confined at the center of optimized bowtie apertures, enhancing vibrational signals and improving chemical identification when using surface...
    Feb. 1, 2019
    Content Dam Lfw Print Articles 2019 02 1902lfw Nb F5
    Unlike standard silica fibers with strong background noise that can obscure weak Raman signals, sapphire fibers are a better option for Raman imaging probes.
    Feb. 1, 2019
    Content Dam Lfw Print Articles 2019 02 1902lfw Nb F3
    A silica Kagome-lattice hollow-core photonic-crystal fiber filled with nitrogen oxide emitting at 4.6 µm in the mid-IR could be useful for remote sensing and free-space communications...
    Feb. 1, 2019
    Optimizing the composition of ceramic phosphors for laser-diode-based solid-state lighting improves efficiency and heat-handling ability.
    Feb. 1, 2019
    Content Dam Lfw Print Articles 2019 02 1902lfw Nb F2
    A nanophotonic lens with a complex structure, placed over a light-emitting nanowire, greatly reduces the divergence angle of the light output.
    Feb. 1, 2019
    Content Dam Lfw Print Articles 2019 02 1902lfw Nb F1
    As particles containing nuclear material decay, the physical recoil motion can be quantified and related to kinetic energy, which uniquely identifies the type of material present...
    Feb. 1, 2019