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<p>A multifunctional chiral metasurface based on an Au–Nb<sub>2</sub>O<sub>5</sub>–Au configuration is proposed to achieve strong circular and linear dichroism in the visible region. The incorporation of a high-index Nb<sub>2</sub>O<sub>5</sub> dielectric spacer enhances plasmon–cavity coupling, leading to sharp resonances and improved polarization selectivity. The metasurface exhibits pronounced spin-dependent reflection, with a circular dichroism (CD) exceeding 0.7 at 670&#xa0;nm and a linear dichroism (LD) of 0.84 at 490&#xa0;nm, demonstrating simultaneous control over circular and linear polarization states. The sensing capability is further explored for enantiomeric detection of D- and L-phenylalanine, where distinct resonance shifts and opposite CD amplitude variations confirm visible-range chiral selectivity. The coexistence of strong CD and LD responses establishes the proposed metasurface as a compact and efficient platform for polarization-resolved biosensing, photonic polarization control, and secure optical communication applications.</p>

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Multifunctional Nb2O5 based chiral metasurface for strong dichroism, polarization conversion and label-free enantiomer detection

  • 期刊论文

  • 发表日期：

    2026年4月10日

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  • Vishakha Sharma,
  • Yogita Kalra,
  • Ravindra Kumar Sinha

摘要

A multifunctional chiral metasurface based on an Au–Nb2O5–Au configuration is proposed to achieve strong circular and linear dichroism in the visible region. The incorporation of a high-index Nb2O5 dielectric spacer enhances plasmon–cavity coupling, leading to sharp resonances and improved polarization selectivity. The metasurface exhibits pronounced spin-dependent reflection, with a circular dichroism (CD) exceeding 0.7 at 670 nm and a linear dichroism (LD) of 0.84 at 490 nm, demonstrating simultaneous control over circular and linear polarization states. The sensing capability is further explored for enantiomeric detection of D- and L-phenylalanine, where distinct resonance shifts and opposite CD amplitude variations confirm visible-range chiral selectivity. The coexistence of strong CD and LD responses establishes the proposed metasurface as a compact and efficient platform for polarization-resolved biosensing, photonic polarization control, and secure optical communication applications.