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  • Using electrostatic doping, the real and imaginary parts of the refractive index along the extraordinary axis of semiconducting, highly aligned, single-walled carbon nanotubes over 4″ wafers can be tuned by up to 5.9% and 14.3% in the infrared at 2,200 nm and 1,660 nm, respectively.

    • Jason Lynch
    • Evan Smith
    • Deep Jariwala
    Article
  • The concept of chiral topological light—a polychromatic light with chiral closed 3D polarization trajectories, space-varying with the azimuthal angle—is introduced and used for efficient sensing in chiral molecules, showcasing an example of successful application of topological concepts in optics.

    • Nicola Mayer
    • David Ayuso
    • Olga Smirnova
    ArticleOpen Access
  • Photon Bose–Einstein condensation is observed in a semiconductor laser, where thermalization and condensation of photons occur using an InGaAs quantum well and an open microcavity. The distinction between regimes of photon Bose–Einstein condensation and conventional lasing are clearly identified.

    • Ross C. Schofield
    • Ming Fu
    • Rupert F. Oulton
    ArticleOpen Access
  • Bose–Einstein condensation of photons is demonstrated in a large-aperture electrically driven InGaAs vertical-cavity surface-emitting laser diode at room temperature. The observed photon Bose–Einstein condensate exhibits the fundamental transversal optical mode at a critical phase-space density.

    • Maciej Pieczarka
    • Marcin Gębski
    • Tomasz Czyszanowski
    ArticleOpen Access
  • A two-dimensional van der Waals material, NbOCl2, that simultaneously exhibits near-unity linear dichroism (~99%) over 100 nm bandwidth in ultraviolet regime and large birefringence (0.26–0.46) within a wide visible–near-infrared transparency window is reported.

    • Qiangbing Guo
    • Qiuhong Zhang
    • Cheng-Wei Qiu
    Article
  • Precise control over doping levels and displacement fields enables the observation of a notable blueshift in the Fermi polaron resonance in trilayer tungsten diselenide. This result highlights the promise of two-dimensional materials for advanced nonlinear optical applications with high tunability.

    • Xi Wang
    News & Views
  • Joseph Izatt’s work advanced the science of imaging in biophotonics and brought optical coherence tomography imaging to the eye care of infants and children and, as live feedback for the surgeon, to ophthalmic microsurgery.

    • Marinko V. Sarunic
    • Cynthia A. Toth
    Obituary
  • A plasmonic platform and a dual gate are integrated in a single-photon emitter made of two-dimensional materials. The combination enables engineered radiative and nonradiative decays, leading to a device quantum efficiency of up to 90%.

    • Su-Hyun Gong
    • Je-Hyung Kim
    News & Views
  • By exploiting nonlinear feedback arising from the interaction of ultrafast laser pulses, self-organized nanolines that appear to defy the limits of diffraction are shown to cut, dice, and structure optical materials, fabricating true zero-order sapphire waveplates and crystalline micro-prisms.

    • Fatih Ömer Ilday
    News & Views
  • Although three-dimensional laser nanofabrication has become an established and widespread technology, research towards achieving higher resolutions, higher speeds, lower costs, mass production, more material availability and more functionality for this technology continues.

    • Rachel Won
    Meeting Report
  • Researchers have achieved AND, OR and NOT gates, using localized exciton polaritons at room temperature. The logic is based on temporal gates, rather than relying on the usual spatial propagation approaches.

    • Hui Li
    • Fei Chen
    • Jian Wu
    ArticleOpen Access
  • An optical accelerator is designed to leverage a multiple-scattering cavity to passively induce optical nonlinear random mapping with a continuous-wave laser at a constant low power (~21 mW), providing a new avenue for optical computing.

    • Fei Xia
    • Kyungduk Kim
    • Hui Cao
    ArticleOpen Access