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<p>Photonic devices operating in the ultraviolet UV-C range (100–280 nm) have diverse applications from super-resolution microscopy to optical communications, and their advances promise to unlock new opportunities across science and technology. However, generating and detecting ultrafast light signals in this spectral range remains a major challenge. Here, we report an integrated UV-C source-sensor platform that combines phase-matched second-order processes in nonlinear optical crystals for the efficient generation of femtosecond UV-C laser pulses with a new class of room temperature photodetectors based on two-dimensional (2D) semiconductors. Unexpectedly, these 2D sensors exhibit a linear to super-linear photocurrent response to pulse energy, a highly desirable property, laying the foundation for UV-C-based photonics operating on femtosecond timescales over a wide range of pulse energies and repetition rates. As proof of concept, we demonstrate a free-space communication system.</p><p></p>

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Fast ultraviolet-C photonics: generating and sensing laser pulses on femtosecond timescales

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月19日

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  • Benjamin T. Dewes,
  • Tim Klee,
  • Nathan D. Cottam,
  • Joseph J. Broughton,
  • Mustaqeem Shiffa,
  • Tin S. Cheng,
  • Sergei V. Novikov,
  • Oleg Makarovsky,
  • John W. G. Tisch,
  • Amalia Patané

摘要

Photonic devices operating in the ultraviolet UV-C range (100–280 nm) have diverse applications from super-resolution microscopy to optical communications, and their advances promise to unlock new opportunities across science and technology. However, generating and detecting ultrafast light signals in this spectral range remains a major challenge. Here, we report an integrated UV-C source-sensor platform that combines phase-matched second-order processes in nonlinear optical crystals for the efficient generation of femtosecond UV-C laser pulses with a new class of room temperature photodetectors based on two-dimensional (2D) semiconductors. Unexpectedly, these 2D sensors exhibit a linear to super-linear photocurrent response to pulse energy, a highly desirable property, laying the foundation for UV-C-based photonics operating on femtosecond timescales over a wide range of pulse energies and repetition rates. As proof of concept, we demonstrate a free-space communication system.