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Showing 1–11 of 11 results
Advanced filters: Author: Johannes Fröch Clear advanced filters

  • Large aperture, diffractive metaoptics for broadband imaging have posed an outstanding challenge for miniaturized optics. In this work, Fröch, Chakravarthula, and colleagues address these challenges and successfully demonstrate a meta-optic with a 1 cm, f/2 aperture for full color imaging.

    • Johannes E. Fröch
    • Praneeth Chakravarthula
    • Arka Majumdar
    ResearchOpen Access
    Nature Communications
    Volume: 16, P: 1-10

  • Achieving nonlinear optical response of free-space planar solid devices in the few-photon regime will provide several technological advances. Here, the authors demonstrate a self-hybridised perovskite metasurface with strong nonlinear absorption at record low incident powers, by means of cavity critical coupling engineering

    • Jie Fang
    • Abhinav Kala
    • Arka Majumdar
    ResearchOpen Access
    Nature Communications
    Volume: 16, P: 1-12

  • Hexagonal boron nitride (hBN) is a layered van der Waals material showing promise for nanophotonics. Here, the authors design hBN photonic crystal cavities with quality factors exceeding 2000, and further demonstrate deterministic tuning of individual cavities by minimally-invasive electron beam induced etching.

    • Sejeong Kim
    • Johannes E. Fröch
    • Igor Aharonovich
    ResearchOpen Access
    Nature Communications
    Volume: 9, P: 1-8

  • Exploring the miniaturization of imaging systems, researchers use inverse-design for broadband meta-optics in the LWIR spectrum. Here, authors achieve a six-fold Strehl ratio improvement in image quality over conventional metalenses using a novel design and computational techniques.

    • Luocheng Huang
    • Zheyi Han
    • Arka Majumdar
    ResearchOpen Access
    Nature Communications
    Volume: 15, P: 1-8

  • Direct writing of active defects is a much sought-after step towards scalable quantum technologies. Here, the authors show a flexible approach by transferring momentum from an ion beam to thin films pre-deposited onto diamond surfaces (using films of Si, Ge, Sn or Pb) or fiber cores (using Eu).

    • Johannes E. Fröch
    • Alan Bahm
    • Milos Toth
    ResearchOpen Access
    Nature Communications
    Volume: 11, P: 1-8

  • Metalens with typical chromatic aberrations, when attached to the distal tip of a conventional endoscope, simultaneously encodes different depths into the RGB channels of a camera at the proximal end.

    • Aamod Shanker
    • Johannes E. Fröch
    • Arka Majumdar
    ResearchOpen Access
    Light: Science & Applications
    Volume: 13, P: 1-14

  • Large aperture and wide field of view eyepiece optics are composed of two layers of ultra-flat, lightweight meta-optics.

    • Anna Wirth-Singh
    • Johannes E. Fröch
    • Arka Majumdar
    ResearchOpen Access
    Light: Science & Applications
    Volume: 14, P: 1-10

  • Zhelyeznyakov and coworkers present a data-free physics-informed neural network to model and optimize the electromagnetic field distribution of large-scale ( ~ 1 mm in diameter) optical meta-lenses. This simplified method can speed up the design of large aperture meta-optics.

    • Maksym Zhelyeznyakov
    • Johannes Fröch
    • Arka Majumdar
    ResearchOpen Access
    Communications Engineering
    Volume: 2, P: 1-8