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Ultra-high extinction ratio micropolarizers using plasmonic lenses
J J Peltzer1, P D Flammer, T E Furtak
1Department of Physics, Colorado School of Mines, Golden, Colorado 80401, USA.
Optics Express
|September 22, 2011
Summary
A novel plasmonic micropolarizing filter achieves ultra-high extinction ratios over 10¹¹, enabling advanced optical applications. This design is easily fabricated and compatible with focal plane arrays.
Area of Science:
- Photonics and optical engineering
- Plasmonics
- Nanotechnology
Background:
- High extinction ratio polarizers are crucial for optical systems.
- Existing technologies face limitations in performance and scalability.
Purpose of the Study:
- To design and experimentally demonstrate a new plasmonic ultra-high extinction ratio micropolarizing transmission filter.
- To achieve extinction ratios exceeding 10¹¹ for TM polarized light.
Main Methods:
- Utilizing dielectric coated metal gratings to couple light into surface plasmons.
- Employing a metal-insulator-metal (MIM) waveguide structure.
- Transmitting light through a sub-wavelength aperture.
- Finite element method (FEM) simulations for performance prediction.
- Experimental validation of spectral and polarization response.
Main Results:
- Predicted extinction ratios exceeding 10¹¹ via FEM simulations.
- Experimental results show excellent agreement with simulations.
- Demonstrated compatibility with focal plane array pixel pitches.
Conclusions:
- The proposed plasmonic filter design offers unprecedented extinction ratios.
- The filter is easily fabricated and scalable for practical applications.
- This technology has significant potential for advanced optical imaging and sensing.
