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Showing 1–3 of 3 results
Advanced filters: Author: Witlef Wieczorek Clear advanced filters

  • The authors investigate the optical response of marginally twisted MoSe2/WSe2 heterobilayers and identify two types of trapped excitons depending on laser excitation power and temperature: excitons trapped in shallow defects and excitons trapped in the moire potential. At strong excitation powers, interlayer biexcitons are identified.

    • Hanlin Fang
    • Qiaoling Lin
    • Witlef Wieczorek
    ResearchOpen Access
    Nature Communications
    Volume: 14, P: 1-7

  • The first enhancement cavity for femtosecond ultraviolet pulses is demonstrated. More than 7 W of average ultraviolet power at an 81 MHz repetition rate, available to pump a nonlinear crystal inside the cavity, is exploited in an implementation of a powerful source for high-rate experiments with entangled multiphoton states.

    • Roland Krischek
    • Witlef Wieczorek
    • Harald Weinfurter
    Research
    Nature Photonics
    Volume: 4, P: 170-173

  • Dielectric metasurfaces with strong nonlinearities hold promise for integrated nanophotonics and quantum technologies, yet their fabrication is hindered by material-dependent challenges and limited material choices with second-order optical nonlinearities. Here, the authors employ top-down lithography and anisotropic wet etching to fabricate atomically precise, ultrathin metasurfaces highly efficient for second-harmonic generation.

    • George Zograf
    • Betül Küçüköz
    • Timur O. Shegai
    ResearchOpen Access
    Communications Physics
    Volume: 8, P: 1-12