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Updated: Sep 18, 2025

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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Thermally Tunable Bi-Functional Metasurface Based on InSb for Terahertz Applications.

Rafael Charca-Benavente1, Rupesh Kumar2, Ruth Rubio-Noriega3

  • 1Graduate School, Universidad Nacional de Ingeniería, Lima 15333, Peru.

Materials (Basel, Switzerland)
|June 27, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a tunable metasurface using indium antimonide (InSb) for terahertz (THz) applications. It achieves perfect absorption at 280 K and efficient polarization conversion at 200 K, offering versatile THz functionalities.

Keywords:
indium antimonide (InSb)metasurfaceperfect absorberpolarization converterterahertz (THz)thermal tuning

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Area of Science:

  • Metasurfaces
  • Terahertz (THz) technology
  • Materials science

Background:

  • Metasurfaces offer unique electromagnetic properties.
  • Indium antimonide (InSb) exhibits temperature-dependent permittivity, enabling tunable functionalities.
  • Terahertz (THz) frequencies are crucial for advanced sensing and imaging.

Purpose of the Study:

  • To propose and analyze a thermally tunable metasurface based on InSb for THz applications.
  • To demonstrate dual functionalities: single-band perfect absorption and efficient polarization conversion.
  • To investigate the impact of temperature on metasurface performance.

Main Methods:

  • Design and simulation of an InSb-based metasurface.
  • Analysis of temperature-dependent electromagnetic response.
  • Parametric studies on structural parameters (InSb size, SiO2 thickness) and incident angles.

Main Results:

  • Near-unity absorptance (100%) achieved at 0.408 THz at 280 K (metallic state of InSb).
  • High polarization conversion ratio (>85%) demonstrated between 0.56-0.93 THz at 200 K (dielectric state of InSb).
  • Stable performance observed for incident angles up to 45°.
  • Tunable absorption intensity and resonance frequency via structural modifications.

Conclusions:

  • The proposed InSb metasurface offers dual, thermally controlled functionalities for THz applications.
  • The device exhibits high performance in both absorption and polarization conversion modes.
  • Potential applications include THz sensing, imaging, filtering, and wavefront engineering.