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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
Published on: November 21, 2019
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.
Nanotechnology
|October 20, 2012
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.
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.
