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An omni-directional mid-infrared tunable plasmonic polarization filter.

Mohammed Nadhim Abbas1, Cheng-Wen Cheng, Yia-Chung Chang

  • 1Research Centre for Applied Sciences, Academia Sinica, Taipei 115, Taiwan.

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|October 20, 2012
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Summary

This study demonstrates an angle-independent polarizer using a plasmonic sandwich structure for mid-infrared applications. The device achieves 99% polarization and tunable wavelengths, offering efficient light manipulation.

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Area of Science:

  • Plasmonics
  • Optical Engineering
  • Materials Science

Background:

  • Localized surface plasmon polaritons enable novel optical phenomena.
  • Mid-infrared (mid-IR) applications require efficient polarization control.
  • Plasmonic nanostructures offer unique light-matter interactions.

Purpose of the Study:

  • To investigate a plasmonic sandwich structure as an angle-independent polarizer.
  • To achieve high polarization efficiency and tunable wavelengths in the mid-IR.
  • To explore the plasmon-polariton band structures of the proposed nanostructure.

Main Methods:

  • Fabrication and characterization of a (metal elliptical disc)/(dielectric spacer)/(metal film) structure.
  • Experimental measurements using Fourier transform infrared spectroscopy.
  • Numerical simulations employing the rigorous coupled wave analysis (RCWA) method.

Main Results:

  • An angle-independent polarizer with 99% degree of polarization was achieved experimentally and theoretically.
  • High extinction ratios (20–40 dB) were obtained by tuning the elliptical disc axis ratio.
  • Tunable polarized light wavelengths were demonstrated by modifying structural parameters.

Conclusions:

  • The plasmonic sandwich structure is a highly effective angle-independent polarizer in the mid-IR.
  • The device offers significant potential for tunable mid-IR optical components.
  • RCWA simulations accurately predict the optical performance of the plasmonic polarizer.