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<p>On-chip integrable circularly polarized light (CPL) detectors hold significant potential for applications in optical communications, bioimaging, quantum information, and intelligent sensing, enabling chip-scale chiral light detection and information processing. However, current developments in materials and structural designs struggle to achieve wide-spectral detection capability while maintaining high circular polarization discrimination. This limitation significantly constrains the practical applicability of such detectors in complex environments and object detection scenarios. Herein, we propose a CPL detector based on a twist-stacked black phosphorus (b-p) system. By utilizing twisted b-p as an artificially constructed unit with chiral response and designing a symmetry-stacked sandwich structure in space, we achieve bipolar circular polarization detection and imaging across a wide wavelength range (from visible light to mid-infrared), with peak responsivity reaching 0.1 A/W. This design demonstrates both theoretically and experimentally the feasibility of utilizing a twist-stacked b-p system for wide-spectral CPL detection. This advancement offers valuable insights for addressing the bottlenecks in chip-integrated CPL detection technology.</p>

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Twist-stacked black phosphorus for wide-spectral chiral photodetection

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月17日

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  • Hao Jiang,
  • Liheng An,
  • Xiaolong Chen,
  • Guoqiang Xu,
  • Yan Zhang,
  • Jintao Fu,
  • Xuran Dai,
  • Yuzhe Yang,
  • Ruihua He,
  • Xingzhan Wei,
  • Xiang-Long Yu,
  • Cheng-Wei Qiu,
  • Weibo Gao

摘要

On-chip integrable circularly polarized light (CPL) detectors hold significant potential for applications in optical communications, bioimaging, quantum information, and intelligent sensing, enabling chip-scale chiral light detection and information processing. However, current developments in materials and structural designs struggle to achieve wide-spectral detection capability while maintaining high circular polarization discrimination. This limitation significantly constrains the practical applicability of such detectors in complex environments and object detection scenarios. Herein, we propose a CPL detector based on a twist-stacked black phosphorus (b-p) system. By utilizing twisted b-p as an artificially constructed unit with chiral response and designing a symmetry-stacked sandwich structure in space, we achieve bipolar circular polarization detection and imaging across a wide wavelength range (from visible light to mid-infrared), with peak responsivity reaching 0.1 A/W. This design demonstrates both theoretically and experimentally the feasibility of utilizing a twist-stacked b-p system for wide-spectral CPL detection. This advancement offers valuable insights for addressing the bottlenecks in chip-integrated CPL detection technology.