Abstract- Realization of broadband cross-polarization conversion in transmission mode in the terahertz region using a single-layer metasurface

Wenwei Liu, Shuqi Chen, Zhancheng Li, Hua Cheng, Ping Yu, Jianxiong Li, and Jianguo Tian

https://www.osapublishing.org/ol/abstract.cfm?URI=ol-40-13-3185#Abstract

We present the design specifications and in-depth analysis of a terahertz (THz) broadband cross-polarization converter composed of a single-layer metasurface. This device can convert linearly polarized light into its cross-polarization in transmission mode. Different from other polarization conversion devices, this effect results from the suppression and enhancement for different electric components. The broadband characteristic is also achieved by specific partial symmetries designed in the structure. The proposed polarization converter can aid in the development of novel plasmonic polarization devices, and can help to overcome certain limitations of the customary designs that have been proposed thus far.

© 2015 Optical Society of America

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Abstract- An ultrathin terahertz quarter-wave plate using planar babinet-inverted metasurface

An ultrathin terahertz quarter-wave plate using planar babinet-inverted metasurface Dacheng Wang, Yinghong Gu, Yandong Gong, Cheng-Wei Qiu, and Minghui Hong  »View Author Affiliations Optics Express, Vol. 23, Issue 9, pp. 11114-11122 (2015) http://dx.doi.org/10.1364/OE.23.011114

http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-23-9-11114

Optics Express, Vol. 23, Issue 9, pp. 11114-11122 (2015)

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Metamaterials promise an exotic approach to artificially manipulate the polarization state of electromagnetic waves and boost the design of polarimetric devices for sensitive detection, imaging and wireless communication. Here, we present the design and experimental demonstration of an ultrathin (0.29λ) terahertz quarter-wave plate based on planar babinet-inverted metasurface. The quarter-wave plate consisting of arrays of asymmetric cross apertures reveals a high transmission of 0.545 with 90 degrees phase delay at 0.870 THz. The calculated ellipticity indicates a high degree of polarization conversion from linear to circular polarization. With respect to different incident polarization angles, left-handed circular polarized light, right-handed circular polarized light and elliptically polarized light can be created by this novel design. An analytical model is applied to describe transmitted amplitude, phase delay and ellipticitiy, which are in good agreement with the measured and simulated results. The planar babinet-inverted metasurface with the analytical model opens up avenues for new functional terahertz devices design.

© 2015 Optical Society of America