Astronomical instrumentation

  • Article
    | Open Access

    Adaptive optics wavefront sensors need to be in a pupil plane and are insensitive to certain wavefront-error modes. The authors present a wavefront sensor based on a photonic lantern fibre-mode-converter and deep learning, which can be placed at the same focal plane accessing nondegenerate wavefront information and reconstructing the wavefront.

    • Barnaby R. M. Norris
    • , Jin Wei
    •  & Sergio G. Leon-Saval
  • Article
    | Open Access

    There is significant interest in providing real-world applications for metamaterials. Here, the authors design an Advanced Short Backfire Antenna, augmented with anisotropic metamaterial surfaces to achieve high aperture efficiency across two frequency bands, making the antenna ideal for spaceborne applications.

    • J. Daniel Binion
    • , Erik Lier
    •  & Douglas H. Werner
  • Article
    | Open Access

    Alumina is thought to be the main condensate to form in the gas outflow from oxygen-rich evolved stars. Here, the authors perform a condensation experiment with alumina in a low-gravity environment, and find spectroscopic evidence for a sharp feature at a wavelength of 13.55 μm.

    • Shinnosuke Ishizuka
    • , Yuki Kimura
    •  & Yuko Inatomi
  • Article
    | Open Access

    The IceCube Neutrino Observatory has been recording a flux of high-energy cosmic neutrinos since 2013. Here, the authors investigate the possibility of increasing its sensitivity by implementing wavelength shifting optics within IceCube’s drill holes.

    • Imre Bartos
    • , Zsuzsa Marka
    •  & Szabolcs Marka