High efficiency and broad bandwidth terahertz vortex beam generation based on ultra-thin transmission Pancharatnam-Berry metasurfaces
Wenyu Li(李文宇)1,2, Guozhong Zhao(赵国忠)1,†, Tianhua Meng(孟田华)2, Ran Sun(孙然)1, and Jiaoyan Guo(郭姣艳)1
1 Department of Physics, Capital Normal University, Beijing Key Laboratory for THz Spectroscopy and Imaging, Key Laboratory of THz Optoelectronics, Ministry of Education, Beijing 100048, China; 2 Institute of Solid State Physics, Shanxi Datong University, Datong 037009, China
Abstract The terahertz (THz) vortex beam generators are designed and theoretically investigated based on single-layer ultra-thin transmission metasurfaces. Noncontinuous phase changes of metasurfaces are obtained by utilizing Pancharatnam-Berry phase elements, which possess different rotation angles and are arranged on two concentric rings centered on the origin. The circularly polarized incident THz beam could be turned into a cross-polarization transmission wave, and the orbital angular momentum (OAM) varies in value by . The values change from to , and the maximal cross-polarization conversion efficiency that could be achieved is 23%, which nearly reaches the theoretical limit of a single-layer structure. The frequency range of the designed vortex generator is from 1.2 THz to 1.9 THz, and the generated THz vortex beam could keep a high fidelity in the operating bandwidth. The propagation behavior of the emerged THz vortex beam is analyzed in detail. Our work offers a novel way of designing ultra-thin and single-layer vortex beam generators, which have low process complexity, high conversion efficiency and broad bandwidth.
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 62071312), the Important R&D Projects of Shanxi Province, China (Grant No. 201803D121083), and the Shanxi Scholarship Council (Grant No. 2020-135).
Wenyu Li(李文宇), Guozhong Zhao(赵国忠), Tianhua Meng(孟田华), Ran Sun(孙然), and Jiaoyan Guo(郭姣艳) High efficiency and broad bandwidth terahertz vortex beam generation based on ultra-thin transmission Pancharatnam-Berry metasurfaces 2021 Chin. Phys. B 30 058103
[1] O'neil A T, Vicar I M, Allen L and Padgett M J 2002 Phys. Rev. Lett.88 053601 [2] Simpson N B, Dholakia K, Allen L and Padgett M J 1997 Opt. Lett.22 52 [3] Bouchard F, Leon I D, Schulz S A, Upham J, Karimi E and Boyd R W 2014 Appl. Phys. Lett.105 101905 [4] Karimi E, Schulz S A, Leon I D, Qassim H, Upham J and Boyd R W 2014 Light: Sci. Appl.3 167 [5] Guo Y H, Yan L S, Pan W and Luo B 2016 Plasmonics11 337 [6] Ran Y Z, Liang J G, Cai T and Li H P 2018 Opt. Commun.427 101 [7] Jin J J, Luo J, Zhang X H, Gao H, Pu M B, Gao P, Zhao Z Y and Luo X G 2016 Sci. Rep.6 24286 [8] Ding F, Chen Y T and Bozhevolnyi S I 2020 Nanophotonics9 371 [9] Chen M L, Jiang L J and Sha W 2018 Appl. Sci.8 362 [10] Chen M L, Jiang L J and Sha W 2017 IEEE T Antenn. Propag.65 396 [11] Yi A L, Yan L S, Pan Y, Jiang L, Chen Z Y, Pan W and Luo B 2018 Opt. Commun.408 42 [12] Li X K, Li Y, Zeng X N and Han Y H 2018 J. Opt.20 125604 [13] Li M M, Yan S H, Yao B L, Liang Y S and Zhang P 2016 Opt. Express24 20604 [14] Liu K, Cheng Y Q, Yang Z C, Wang H Q, Qin Y L and Li X 2015 IEEE Antennas and Wireless Propagation Letters14 711 [15] Beijersbergen M W, Coerwinkel R P C, Kristensen M and Woerdman J P 1994 Opt. Commun.112 321 [16] Li Y M, Kim J W and Escuti M J 2012 Appl. Opt.51 8236 [17] Cheng L, Hong W and Hao Z C 2014 Sci. Rep.4 4814 [18] Zhou L, Zhao G Z and Li X N 2019 Acta. Phys. Sin.68 108701 (in Chinese) [19] Wang W, Li Y, Guo Z Y, Li R Z, Zhang J R, Zhang A J and Qu S L 2015 J. Opt.17 045102 [20] Yu N F, Genevet P, Kats M A, Aieta F, Tetienne J P, Capasso F and Gaburro Z 2011 Science334 333 [21] Wang W, Guo Z Y, Sun Y X, Shen F, Li Y, Liu Y, Wang X S and Qu S L 2015 Opt. Commun.355 321 [22] He J W, Wang X K, Hu D, Ye J S, Feng S F, Kan Q and Zhang Y 2013 Opt. Express21 020230 [23] Niv A, Gorodetski Y, Kleiner V and Hasman E 2008 Opt. Lett.33 2910 [24] Tang S W, Li X K, Pan W K, Zhou J, Jiang T and Ding F 2019 Opt. Express27 4281 [25] Akram M R, Mehmood M Q, Bai X D, Jin R H, Premaratne M and Zhu W R 2019 Adv. Optical Mater.7 1801628 [26] Luo W J, Sun S L, Xu H X, He Q and Zhou L 2017 Phys. Rev. Applied7 044033 [27] Li X N, Zhou L and Zhao G Z 2019 Acta. Phys. Sin.68 238101 (in Chinese) [28] Xu Y H, Li Q, Zhang X Q, Wei M G, Xu Q, Wang Q, Zhang H F, Zhang W T, Hu C, Zhang Z W, Zhang C L, Zhang X X, Han J G and Zhang W L 2019 ACS Photon.6 2933 [29] Chaudhuri K, Shaltout A, Deesha S, Guler U, Dutta A, Shalaev V M and Boltasseva A 2019 ACS Photon.6 99 [30] Yuan Y Y, Zhang K, Ratni B, Song Q H, Ding X M, Wu Q, Burokur S N and Genevet P 2020 Nat. Commun.11 4186 [31] Ding X M, Monticone F, Zhang K, Zhang L, Gao D L, Burokur S N, Lustrac A D, Wu Q, Qiu C W and Alu A 2015 Adv. Mater.27 1195
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