近日，英国诺丁汉大学Patan, Amalia团队研究了快速紫外C光子学：在飞秒时间尺度上产生和感知激光脉冲。该研究于2025年11月19日发表在《光：科学与应用》杂志上。

工作在紫外C波段（100–280纳米）的光子器件，从超分辨显微成像到光通信领域具有广泛应用，其技术进展有望开启科学与技术的新机遇。然而，在该光谱范围内实现超快光信号的产生与探测仍是重大挑战。

研究组报道了一种集成化紫外C波段光源-传感平台：通过结合非线性光学晶体中的相位匹配二阶过程实现飞秒紫外C激光脉冲的高效产生，并搭载基于二维半导体的新型室温光电探测器。出乎意料的是，这些二维传感器对脉冲能量表现出从线性到超线性的光电流响应特性——这一极具价值的性质，为在飞秒时间尺度、宽脉冲能量与重复频率范围内运行的紫外C波段光子学应用奠定了基础。作为概念验证，研究组展示了一套自由空间通信系统。

附：英文原文

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

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

Issue&Volume: 2025-11-19

Abstract: Photonic devices operating in the ultraviolet UV-C range (100–280nm) 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.

DOI: 10.1038/s41377-025-02042-2

Source: https://www.nature.com/articles/s41377-025-02042-2