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<p>Readily implemented broadband THz sources extend the reach of THz in diagnostic and sensing applications. Coherently controlled photocurrents in pure, cost-effective bulk Germanium and Germanium quantum wells render such broadband and gapless terahertz emission, overcoming the bandwidth limitations of traditional III-V and II-VI semiconductor-based THz emitters. Precise phase control between the fundamental and its second harmonic governs the THz field dynamics. The presented scheme, which utilizes low-energy 100&#xa0;fs optical pulses centered around 1550&#xa0;nm, is readily accessible through affordable ultrafast fiber laser technology and frequency doubling.</p>

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Coherent Control of Photocurrents in Germanium for Gapless and Broadband Terahertz Emission

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年8月15日

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  • Daniel Anders,
  • Michael R. Zengel,
  • Rodrigo Sandoval Rodriguez,
  • Kalle Bräumer,
  • Sangam Chatterjee,
  • Markus Stein

摘要

Readily implemented broadband THz sources extend the reach of THz in diagnostic and sensing applications. Coherently controlled photocurrents in pure, cost-effective bulk Germanium and Germanium quantum wells render such broadband and gapless terahertz emission, overcoming the bandwidth limitations of traditional III-V and II-VI semiconductor-based THz emitters. Precise phase control between the fundamental and its second harmonic governs the THz field dynamics. The presented scheme, which utilizes low-energy 100 fs optical pulses centered around 1550 nm, is readily accessible through affordable ultrafast fiber laser technology and frequency doubling.