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Nano-fabricated pixelated micropolarizer array for visible imaging polarimetry
Zhigang Zhang1, Fengliang Dong2, Teng Cheng1
1CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, University of Science and Technology of China, Hefei 230027, China.
The Review of Scientific Instruments
|November 3, 2014
Summary
A novel pixelated micropolarizer array (PMA) enables real-time polarization imaging. This aluminum PMA effectively highlights polarized objects and reveals surface contours from a single image frame.
Area of Science:
- Optics and Photonics
- Materials Science
- Imaging Technology
Background:
- Polarization imaging offers unique contrast mechanisms for object detection and surface analysis.
- Traditional polarimetry methods can be complex and time-consuming.
- Real-time polarization imaging requires advanced optical components.
Purpose of the Study:
- To introduce and characterize a novel pixelated micropolarizer array (PMA) for real-time visible imaging polarimetry.
- To demonstrate the PMA's suitability for polarization imaging applications.
- To showcase the ability to extract polarization information from single-frame images.
Main Methods:
- Fabrication of a 320 × 240 aluminum PMA using electron beam lithography.
- Characterization of grating parameters: period (140 nm), duty ratio (0.5), and depth (100 nm).
- Measurement of optical performance: extinction ratio (75) and maximum polarization transmittance (78.8%).
Main Results:
- The fabricated PMA exhibits excellent optical performance metrics.
- The PMA successfully enables real-time polarization imaging from single-frame data.
- Degree of linear polarization and angle of linear polarization images were computed.
Conclusions:
- The developed PMA is a viable component for advanced polarization imaging systems.
- The PMA facilitates real-time analysis, highlighting polarized targets against unpolarized backgrounds.
- Surface contours of objects can be effectively visualized using the polarization angle information.
