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<p>Metal mesh filters have been used as essential components in far-infrared (IR) and terahertz (THz) applications, where they reduce noise and, hence, improve the detected signal. They are widely employed in space-based astronomy, high-altitude observations, and sensing technologies. Conventional filters typically work at fixed frequencies and often require complex fabrication processes. Yet, many applications demand filter tunability across a broad frequency range without compromising filter performance. In this work, we demonstrate tunable THz filters fabricated using a fast, reproducible laser structuring method. The filters are characterized with a THz time-domain spectroscopy (TDS) system. The experimental results show excellent agreement with simulations. Our filters show high transmission at the bandpass frequency (85–95%) and strong out-of-band suppression (&lt; 3–6%) over a wide spectral range (0.29–1.52 THz).</p>

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High-Quality Terahertz Mesh Filters Tunable by Mechanical Translation

  • 期刊论文

  • 发表日期：

    2026年3月12日

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  • Hakan Alaboz,
  • Felix Gorka,
  • Daniel Johannes Förster,
  • Matthias Buser,
  • Volker Bucher,
  • Martin Koch

摘要

Metal mesh filters have been used as essential components in far-infrared (IR) and terahertz (THz) applications, where they reduce noise and, hence, improve the detected signal. They are widely employed in space-based astronomy, high-altitude observations, and sensing technologies. Conventional filters typically work at fixed frequencies and often require complex fabrication processes. Yet, many applications demand filter tunability across a broad frequency range without compromising filter performance. In this work, we demonstrate tunable THz filters fabricated using a fast, reproducible laser structuring method. The filters are characterized with a THz time-domain spectroscopy (TDS) system. The experimental results show excellent agreement with simulations. Our filters show high transmission at the bandpass frequency (85–95%) and strong out-of-band suppression (< 3–6%) over a wide spectral range (0.29–1.52 THz).