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Infrared surface polaritons on antimony.

Justin W Cleary1, Gautam Medhi, Monas Shahzad

  • 1Sensors Directorate, Air Force Research Laboratory, Wright-Patterson Air Force Base, Ohio 45433, USA. Justin.Cleary@WPAFB.af.mil

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|February 15, 2012
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Summary

Antimony (Sb) shows promise for infrared surface polaritons (SPs) due to its unique optical properties. Researchers explored Sb

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Optics and Photonics

Background:

  • Semimetals like antimony (Sb) offer unique optical properties compared to traditional plasmonic materials.
  • Surface polaritons (SPs) are crucial for manipulating light at the nanoscale, with potential applications in infrared technologies.

Purpose of the Study:

  • To investigate the potential of antimony as a host material for infrared surface polaritons.
  • To characterize the optical constants and SP properties of antimony films and gratings.

Main Methods:

  • Optical constants of thermally-evaporated Sb films were measured from 1 to 40 μm.
  • Drude model fitting was used to determine plasma and carrier relaxation frequencies.
  • Electrodynamic simulations using the Finite Element Method (FEM) were employed to study SP modes.

Main Results:

  • Antimony exhibits a negative real permittivity for wavelengths beyond 11 μm.
  • Resonant decreases in reflectance were observed for Sb lamellar gratings, indicating SP excitation.
  • Experimental results for resonance angles and spectral line shapes agreed with theoretical predictions.

Conclusions:

  • Antimony is a viable host for infrared surface polaritons, particularly in the wavelength range where its permittivity is positive.
  • The excitation of SPs on antimony gratings demonstrates its potential for novel photonic devices.
  • FEM simulations confirmed the existence and dependence of SP modes on material permittivity.