Journal
OPTICS EXPRESS
Volume 25, Issue 22, Pages 27616-27623Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.25.027616
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Funding
- National Natural Science Foundation of China (NSFC) [61661012, 61761010, 61461016, 61361005, 61561013]
- Natural Science Foundation of Guangxi [2017JJB160028]
- Program for Innovation Research Team of Guilin University of Electronic Technology
- Dean Project of Guangxi Key Laboratory of Wireless Wideband Communication and Signal Processing
- Innovation Project of GUET Graduate Education [2017YJCX28]
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The polarization conversion of electromagnetic (EM) waves, especially linear-to-circular (LTC) polarization conversion, is of great significance in practical applications. In this study, we propose an ultra-wideband high-efficiency reflective LTC polarization converter based on a metasurface in the terahertz regime. It consists of periodic unit cells, each cell of which is formed by a double split resonant square ring, dielectric layer, and fully reflective gold mirror. In the frequency range of 0.60 - 1.41 THz, the magnitudes of the reflection coefficients reach approximately 0.7, and the phase difference between the two orthogonal electric field components of the reflected wave is close to 90 degrees or -270 degrees. The results indicate that the relative bandwidth reaches 80% and the efficiency is greater than 88%, thus, ultra-wideband high-efficiency LTC polarization conversion has been realized. Finally, the physical mechanism of the polarization conversion is revealed. This converter has potential applications in antenna design, EM measurement, and stealth technology. (C) 2017 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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