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<p>Circular dichroism (CD) represents a crucial optical response of chiral dielectric nanostructures, finding extensive utilization in biochemistry, chiral sensing, biological detection, and pharmaceutical chemistry. In the past, numerous metasurfaces could only operate under a single band and specific incident angles, limiting their practical applicability. Herein, we introduce an oblique Si bar into the pure grating structure, endowing the metasurface with chiral characteristics. It is revealed that this metasurface can generate four intense CD peaks (or valleys) at 1443&#xa0;nm, 1475&#xa0;nm, 1488&#xa0;nm, and 1649&#xa0;nm under normal incidence. Notably, within an incident angle range of 40 degrees, the resonance peaks I-III of this chiral grating metasurface can sustain stable resonance wavelengths and linewidths. To further broaden the applications of the nanostructure, the relationship between wavelength and refractive index is investigated. These findings provide novel perspectives for the design and manipulation of planar chiral materials exhibiting multi-band CD and angular robustness, and also expand the application of chiral structures in refractive index sensors.</p>

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Angle-insensitive multiband circular dichroism spectroscopy and sensing application based on the chiral grating metasurface

  • 期刊论文

  • 发表日期：

    2026年1月20日

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  • Huiping Tang,
  • Yihong Zhou,
  • Yantong Li,
  • Liwei Guan,
  • Haoran Chen,
  • Yan Kong

摘要

Circular dichroism (CD) represents a crucial optical response of chiral dielectric nanostructures, finding extensive utilization in biochemistry, chiral sensing, biological detection, and pharmaceutical chemistry. In the past, numerous metasurfaces could only operate under a single band and specific incident angles, limiting their practical applicability. Herein, we introduce an oblique Si bar into the pure grating structure, endowing the metasurface with chiral characteristics. It is revealed that this metasurface can generate four intense CD peaks (or valleys) at 1443 nm, 1475 nm, 1488 nm, and 1649 nm under normal incidence. Notably, within an incident angle range of 40 degrees, the resonance peaks I-III of this chiral grating metasurface can sustain stable resonance wavelengths and linewidths. To further broaden the applications of the nanostructure, the relationship between wavelength and refractive index is investigated. These findings provide novel perspectives for the design and manipulation of planar chiral materials exhibiting multi-band CD and angular robustness, and also expand the application of chiral structures in refractive index sensors.