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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
Published on: July 8, 2013
Compact bandwidth-tunable polarization filter based on a plasmonic heterograting.
Yuanhai Lin1, Tianrui Zhai, Qianli Ma
1Institute of Information Photonics Technology and College of Applied Sciences, Beijing University of Technology, Beijing 100124, China.
Optics Express
|May 15, 2013
Summary
This study introduces a plasmonic heterograting device that acts as a tunable polarization filter. It efficiently separates linearly polarized light from white light, offering adjustable bandwidth for optical applications.
Area of Science:
- Plasmonics
- Nanophotonics
- Optical Filters
Background:
- Polarization filters are crucial optical components.
- Existing filters may lack tunability or compactness.
- Plasmonic devices offer unique light-matter interaction properties.
Purpose of the Study:
- To demonstrate a novel plasmonic heterograting device.
- To show its function as a compact, bandwidth-tunable polarization filter.
- To investigate its theoretical and experimental tuning characteristics.
Main Methods:
- Fabrication of a plasmonic heterograting with juxtaposed gratings of different periods.
- Coupling of grating into substrate photonic modes.
- Theoretical modeling and experimental validation of device performance.
Main Results:
- The heterograting device functions as a polarization filter.
- Bandwidth tunability achieved by controlling incident angle and grating spectra overlap.
- Selective extraction of linearly polarized light from unpolarized white light.
Conclusions:
- The plasmonic heterograting is a compact and tunable polarization filter.
- The device enables convenient selection of polarized light spectra.
- Potential for developing advanced polarization elements and optical devices.
