Binglian Xiao, F. Lan, Ziqiang Yang, P. Mazumder, Zongjun Shi, Yihui Xu, Hongxin Zeng, Jing Yin
{"title":"Broadband and High-efficiency Circular-polarized Terahertz Frequency Scanning Metasurface","authors":"Binglian Xiao, F. Lan, Ziqiang Yang, P. Mazumder, Zongjun Shi, Yihui Xu, Hongxin Zeng, Jing Yin","doi":"10.1109/PIERS-Fall48861.2019.9021381","DOIUrl":null,"url":null,"abstract":"Due to the inefficiency of effective wave modulation components and dynamical metamaterial in terahertz (THz) range, an alternative approach of frequency sweeping for beam scanning based on a metasurface structure is proposed here. Aiming at broadband and high-efficiency circular-polarized terahertz frequency-scanning, we start with combining Pancharatnam-Berry scheme and generalized Snell’s law to initiate the fundamental schematic design. The hybrid structural unit is composed of an I-shaped dipole and two rectangular dipoles for multi-resonance leading to broadband width. In order to realize directional deflection, the metasurface is arranged through eight rotated units with a fixed π/4 phase differences between adjacent units to reach 2π consecutive phase shift. A 45° phase difference among eight units adjacent in x axis keep in excellent linear maintenance with a bandwidth from 1 THz to 2.1 THz. The simulation result verifies the reflection efficiency of the unit reaches 90% in the operating frequency range. Under right-handed circular polarized normal incident wave, the frequency bandwidth is 1.1 THz (from 1 to 2.1 THz) with a scanning angle range from 17° to 38°. The simulation result is in good agreement with the theoretical analysis. In addition, the reflection efficiency of the scanning beam is more than 50% in the operating frequency range, and the maximum reflection efficiency of the scanning beam achieves 88% at 1.6 THz, which indicates the remarkable inhibition of the unwanted diffraction. The metasurface presented here features the advantages of a wide operating bandwidth and high efficiency, which has potential applications in fast THz imaging, moving target detection and wireless communication.","PeriodicalId":197451,"journal":{"name":"2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall)","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/PIERS-Fall48861.2019.9021381","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 1
Abstract
Due to the inefficiency of effective wave modulation components and dynamical metamaterial in terahertz (THz) range, an alternative approach of frequency sweeping for beam scanning based on a metasurface structure is proposed here. Aiming at broadband and high-efficiency circular-polarized terahertz frequency-scanning, we start with combining Pancharatnam-Berry scheme and generalized Snell’s law to initiate the fundamental schematic design. The hybrid structural unit is composed of an I-shaped dipole and two rectangular dipoles for multi-resonance leading to broadband width. In order to realize directional deflection, the metasurface is arranged through eight rotated units with a fixed π/4 phase differences between adjacent units to reach 2π consecutive phase shift. A 45° phase difference among eight units adjacent in x axis keep in excellent linear maintenance with a bandwidth from 1 THz to 2.1 THz. The simulation result verifies the reflection efficiency of the unit reaches 90% in the operating frequency range. Under right-handed circular polarized normal incident wave, the frequency bandwidth is 1.1 THz (from 1 to 2.1 THz) with a scanning angle range from 17° to 38°. The simulation result is in good agreement with the theoretical analysis. In addition, the reflection efficiency of the scanning beam is more than 50% in the operating frequency range, and the maximum reflection efficiency of the scanning beam achieves 88% at 1.6 THz, which indicates the remarkable inhibition of the unwanted diffraction. The metasurface presented here features the advantages of a wide operating bandwidth and high efficiency, which has potential applications in fast THz imaging, moving target detection and wireless communication.