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Subwavelength Gold Grating as Polarizers Integrated with InP-Based InGaAs Sensors.

Rui Wang1,2,3, Tao Li1,2, Xiumei Shao1,2

  • 1†State Key Laboratories of Transducer Technology, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, People's Republic of China.

ACS Applied Materials & Interfaces
|June 27, 2015
PubMed
Summary

Subwavelength gold gratings were developed for infrared polarimetric imaging. A novel trilayer structure significantly improved performance for InP-based sensors, overcoming limitations of direct integration.

Keywords:
InP-based InGaAs sensorcavity modepolarizersubwavelength gold gratingsurface plasmon polariton

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Area of Science:

  • Optoelectronics
  • Nanophotonics
  • Materials Science

Background:

  • Growing demand for infrared polarimetric imaging in bioscience, communications, and agriculture.
  • Subwavelength metallic gratings offer a method for polarizing light by separating transverse magnetic (TM) and transverse electric (TE) modes.

Purpose of the Study:

  • Design and fabricate subwavelength gold gratings as polarizers for 1.0-1.6 μm InP-based InGaAs sensors.
  • Investigate the polarization capabilities of gold gratings on InP substrates.
  • Address limitations of direct grating integration for improved polarizer performance.

Main Methods:

  • Theoretical modeling using a finite-difference time-domain (FDTD) simulator.
  • Spectral measurements of fabricated gratings.
  • Electron beam lithography (EBL) for fabricating 200 nm gratings.
  • Fabrication and testing of a novel Au/SiO2/InP trilayer structure.

Main Results:

  • Directly integrated subwavelength gold gratings on InP performed poorly as polarizers due to surface plasmon polariton (SPP) modes.
  • Introducing a 200 nm SiO2 layer in an Au/InP bilayer structure significantly improved TM transmission and extinction ratio.
  • At 1.35 μm, TM transmission and extinction ratio showed improvement factors of 8 and 10, respectively, with the trilayer structure.

Conclusions:

  • Subwavelength gold gratings directly on InP are not suitable as polarizers for the targeted wavelengths.
  • The Au/SiO2/InP trilayer structure presents a promising solution for near-infrared polarizers.
  • This trilayer design enhances performance for InP-based InGaAs sensors in polarimetric imaging applications.