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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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Tunable reflecting terahertz filter based on chirped metamaterial structure.

Jing Yang1, Cheng Gong1, Lu Sun1

  • 1Institute of Modern Optics, Nankai University, Key Laboratory of Optical Information Science and Technology, Ministry of Education, Tianjin 300350, China.

Scientific Reports
|December 13, 2016
PubMed
Summary

This study demonstrates a tunable terahertz bandstop filter using chirped metamaterials. Varying silicon bar conductivity with light allows control over filter properties like frequency and bandwidth.

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Area of Science:

  • Physics
  • Materials Science
  • Electrical Engineering

Background:

  • Metamaterials offer unique electromagnetic properties.
  • Terahertz (THz) filters are crucial for various applications.
  • Tunable filters are highly desirable for dynamic control.

Purpose of the Study:

  • To demonstrate a tunable reflecting terahertz bandstop filter.
  • To investigate the tunability of filter characteristics via silicon conductivity.
  • To analyze the performance of a chirped metamaterial structure.

Main Methods:

  • Numerical simulation of a chirped metamaterial structure.
  • Design incorporating concatenated metal and silicon bars.
  • Modulation of silicon bar conductivity using light illumination.

Main Results:

  • Achieved tunable reflectivity, central frequency, and bandwidth.
  • Demonstrated light-induced conductivity changes in silicon bars.
  • Confirmed insensitivity to incident angle and polarization.

Conclusions:

  • The proposed chirped metamaterial acts as a tunable bandstop filter.
  • Light pumping effectively controls modulation depth, bandwidth, shape factor, and center frequency.
  • The structure shows robust performance across different angles and polarizations.