Scholarlink

<p>Tunable sources of narrowband continuous-wave electromagnetic radiation in the terahertz spectral range, spanning from 0.1 THz to 15 THz, are notoriously difficult to produce. Despite substantial research efforts to close the ‘terahertz gap’, there are still no tunable room-temperature continuous-wave sources with powers larger than 0.1 μW in the spectral range 6–11 THz. Here we demonstrate a continuous-wave terahertz source with up to 14 μW of power output in the 6–11 THz band and a total tuning range of 1–11 THz. Our source is based on difference-frequency generation in deeply subwavelength nonlinear metasurfaces with a second-order nonlinear response three orders of magnitude larger than that of the best nonlinear crystals used for terahertz generation. Owing to their subwavelength thickness, the metasurfaces are mostly free from both phase matching and absorption constraints. Tunable terahertz radiation is generated by pumping the metasurfaces with two milliwatt-level continuous-wave mid-infrared lasers in a simple modular set-up that superficially resembles that employed by terahertz photomixers.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Generation of continuous-wave 1–11 THz radiation with intersubband polaritonic metasurfaces

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年4月16日

查看全文
  • J. H. Krakofsky,
  • M. Rieder,
  • S. Stich,
  • S. Schmid,
  • I. Lubianskii,
  • G. Böhm,
  • A. Köninger,
  • M. A. Belkin

摘要

Tunable sources of narrowband continuous-wave electromagnetic radiation in the terahertz spectral range, spanning from 0.1 THz to 15 THz, are notoriously difficult to produce. Despite substantial research efforts to close the ‘terahertz gap’, there are still no tunable room-temperature continuous-wave sources with powers larger than 0.1 μW in the spectral range 6–11 THz. Here we demonstrate a continuous-wave terahertz source with up to 14 μW of power output in the 6–11 THz band and a total tuning range of 1–11 THz. Our source is based on difference-frequency generation in deeply subwavelength nonlinear metasurfaces with a second-order nonlinear response three orders of magnitude larger than that of the best nonlinear crystals used for terahertz generation. Owing to their subwavelength thickness, the metasurfaces are mostly free from both phase matching and absorption constraints. Tunable terahertz radiation is generated by pumping the metasurfaces with two milliwatt-level continuous-wave mid-infrared lasers in a simple modular set-up that superficially resembles that employed by terahertz photomixers.