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Updated: Jan 26, 2026

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Transmit-Array, Metasurface-Based Tunable Polarizer and High-Performance Biosensor in the Visible Regime.

Kai He1, Yidong Liu2, Yongqi Fu3

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|April 14, 2019
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Summary

Researchers developed a novel transmit-array metasurface biosensor. This device offers high sensitivity for detecting environmental refractive index changes, showing potential for advanced biosensing applications.

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Area of Science:

  • Metamaterials and Nanophotonics
  • Biosensing Technologies
  • Optical Engineering

Background:

  • Metasurfaces, including reflect-array and transmit-array types, are classified by structural features.
  • Transmit-array metasurfaces offer unique optical properties for various applications.

Purpose of the Study:

  • To design a transmit-array metasurface for y-polarized incidence with a narrow transmission dip.
  • To develop a tunable polarizer with a wide range of x- to y-polarized transmittivity ratios.
  • To create a high-sensitivity biosensor utilizing the metasurface's polarization sensitivity.

Main Methods:

  • Design of a transmit-array metasurface for y-polarized light.
  • Implementation of linear geometric configurations for tunable polarization control.
  • Characterization of the transmission spectrum, focusing on narrow dips (<3 nm).
  • Development of a biosensor to detect environmental refractive index variations.

Main Results:

  • Achieved a narrow transmission dip (<3 nm) in the metasurface spectrum.
  • Realized a tunable polarizer with transmittivity ratios from 0.031% to 1%.
  • Demonstrated a biosensor with sensitivity (S) of 192 nm/RIU and FOM of 64/RIU for refractive index detection (1.30-1.39).
  • Observed a significantly high FOM* of 92,333/RIU due to narrow-band features and near-zero transmission dips.

Conclusions:

  • The designed transmit-array metasurface exhibits unique narrow-band polarization sensitivity.
  • The developed metasurface-based biosensor demonstrates high performance for refractive index sensing.
  • This novel transmit-array metasurface is a promising candidate for commercial biosensor applications.
  • Lossless transmit-array metasurfaces provide flexibility in detecting either reflectance or transmission spectra.