Generation of Radial Polarized Lorentz Beam with Single Layer Metasurface

A radially polarized Lorentz beam is demonstrated in the terahertz waveband with a single layer metasurface. Composed of cross antennas of various sizes and orientation, the metasurface performs simultaneously a continuous amplitude modulation and a controlled polarization spatial redistribution of...

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Bibliographic Details
Published in:Advanced optical materials 2018-01, Vol.6 (1), p.n/a
Main Authors: Guo, Jin‐Ying, Wang, Xin‐Ke, He, Jing‐Wen, Zhao, Huan, Feng, Sheng‐Fei, Han, Peng, Ye, Jia‐Sheng, Sun, Wen‐Feng, Situ, Guo‐Hai, Zhang, Yan
Format: Article
Language:English
Subjects:
amplitude and polarization modulation
Amplitude modulation
complex light field
Incident waves
Materials science
Metasurfaces
Optics
Polarization
polarization hologram
single layer
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Summary:A radially polarized Lorentz beam is demonstrated in the terahertz waveband with a single layer metasurface. Composed of cross antennas of various sizes and orientation, the metasurface performs simultaneously a continuous amplitude modulation and a controlled polarization spatial redistribution of incident waves of wavelength 400 µm. The metasurface device is designed and characterized using a terahertz time domain spectral imaging system. Experimental results are consistent with theoretical calculations. With the advantage of compactness and simplicity, this device may be applied to generate various complex light fields and in the reconstruction of computer‐generated polarization hologram. Consecutive redistribution of polarization and transmittance is simultaneously achieved with a single layer metasurface. A sample is designed to generate a radial polarized Lorentz beam in the THz region, and the experimental results fit with simulation well. This kind of device can be used in the reconstruction of complex light field and computer generated polarization hologram.
ISSN:2195-1071
2195-1071
DOI:10.1002/adom.201700925