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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.

|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.

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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.

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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.