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Broadband and wide angle infrared wire-grid polarizer
Optics Express
|July 21, 2015
Summary
This study presents a metal-insulator-metal (MIM) grating infrared polarizer. It achieves high transmittance and an excellent polarization extinction ratio over a broad wavelength range and wide incident angles.
Area of Science:
- Optics and Photonics
- Nanotechnology
- Materials Science
Background:
- Infrared polarizers are crucial components in various optical systems.
- Existing polarizers often face limitations in terms of bandwidth, angular performance, or extinction ratio.
Purpose of the Study:
- To design and demonstrate a novel infrared polarizer with superior performance characteristics.
- To explore the potential of metal-insulator-metal (MIM) gratings for advanced polarization control.
Main Methods:
- Design of metal-insulator-metal (MIM) gratings.
- Simulation and analysis of optical transmittance and polarization extinction ratio (ER).
- Investigation of performance across a broad wavelength range (1.5–8 μm) and wide incident angles (up to 80°).
Main Results:
- Achieved transmittance exceeding 85%.
- Demonstrated a polarization extinction ratio (ER) higher than 70 dB.
- Maintained excellent performance over a broadband (1.5–8 μm) and wide angular range (up to 80°).
Conclusions:
- The proposed MIM grating structure offers a highly effective solution for infrared polarization.
- The design leverages magnetic polariton (MP) effects and non-resonant operation for enhanced performance.
- Potential applications include infrared polarizers, beam-splitters, filters, and isolators.
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