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<p>Metasurface-based optical components are becoming increasingly important due to their unparalleled ability to shape and manipulate electromagnetic waves. Planar meta-mirrors with high efficiency and broad operational bandwidth are expected to play a significant role in shaping channel characteristics for 6&#xa0;G communication links due to their reduced SWaP (size, weight, and power) and integrability. Achieving large fractional bandwidth and high efficiency simultaneously using metasurface-based mirrors or reflectors has been challenging. In this work, a highly efficient broadband-focusing meta-mirror has been designed, fabricated, and experimentally demonstrated. The device operates in the D-Band (110-170&#xa0;GHz) and beyond (up to 200&#xa0;GHz), and exhibits unmatched performance in terms of combined fractional bandwidth (58%) and energy efficiency, exceeding 53% over the entire bandwidth with a peak of 77.4% at 135&#xa0;GHz. The high performance is attributed, in part, to relaxed constraints available in the design of optics with low Fresnel numbers. More generally, this offers a new and alternative tool for broadband meta-device design.</p>

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High-Performance, Efficient, Low-Fresnel Number Focusing Metamirror in the D-Band

  • 期刊论文

  • 发表日期：

    2025年4月28日

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  • Fahim Ferdous Hossain,
  • Yun-seok Choi,
  • Abul K. Azad,
  • John F. O’Hara

摘要

Metasurface-based optical components are becoming increasingly important due to their unparalleled ability to shape and manipulate electromagnetic waves. Planar meta-mirrors with high efficiency and broad operational bandwidth are expected to play a significant role in shaping channel characteristics for 6 G communication links due to their reduced SWaP (size, weight, and power) and integrability. Achieving large fractional bandwidth and high efficiency simultaneously using metasurface-based mirrors or reflectors has been challenging. In this work, a highly efficient broadband-focusing meta-mirror has been designed, fabricated, and experimentally demonstrated. The device operates in the D-Band (110-170 GHz) and beyond (up to 200 GHz), and exhibits unmatched performance in terms of combined fractional bandwidth (58%) and energy efficiency, exceeding 53% over the entire bandwidth with a peak of 77.4% at 135 GHz. The high performance is attributed, in part, to relaxed constraints available in the design of optics with low Fresnel numbers. More generally, this offers a new and alternative tool for broadband meta-device design.