基于宽带超表面的太赫兹涡旋波束产生研究
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摘要
基于轨道角动量在光学领域的应用潜力,提出了一种工作在太赫兹频段的S型交叉极化反射式宽带超表面。通过仿真研究了S型单元结构的极化转换特性和反射相位特性,并利用六种不同参数单元结构的有序排列构建了反射式宽带超表面。仿真结果表明,设计的单元结构不仅可以实现高效率的交叉极化反射幅度,而且通过调整尺寸参数可以实现有效的相位调控;在5. 1 THz～7. 4 THz频段范围内,该超表面将线偏振波转化为涡旋波束,效率达到了80%以上。
Based on theapplication potential of orbital angular momentum in the field of optics,an S-type crosspolarized broadband metasurface operating in the terahertz band was proposed. The polarization conversion characteristics and reflection phase characteristics of the S-type unit cell were studied experimentally and theoretically,and two reflective metasurfaces were constructed by using ordered arrangement of six different-parameter unit cells. Simulation results show that the designed S-type unit cell can not only achieve high-efficiency cross-polarization reflection amplitude,but also achieve effective phase regulation by adjusting the size parameters. In the frequency range of 5. 1 ～7.4 THz,metasurface converts linearly polarized waves intovortex beam and efficiency is above 80%.
Based on theapplication potential of orbital angular momentum in the field of optics,an S-type crosspolarized broadband metasurface operating in the terahertz band was proposed. The polarization conversion characteristics and reflection phase characteristics of the S-type unit cell were studied experimentally and theoretically,and two reflective metasurfaces were constructed by using ordered arrangement of six different-parameter unit cells. Simulation results show that the designed S-type unit cell can not only achieve high-efficiency cross-polarization reflection amplitude,but also achieve effective phase regulation by adjusting the size parameters. In the frequency range of 5. 1 ～7.4 THz,metasurface converts linearly polarized waves intovortex beam and efficiency is above 80%.
引文
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[3]CHEN J J,LU Q N,DONG F F,et al.Wireless OAMtransmission system based on elliptical microstrip patch antenna[J].Optics Express,2016,24(11):11531.
[4]李新忠,孟莹,李贺贺,等.完美涡旋波束的产生及其空间自由调控技术[J].光学学报,2016 36(10):1026018.
[5]WANG J,YANG J Y,FAZAL I M,et al.Terabit freespace data transmission employing orbital angular momentum multiplexing[J].Nature Photonics,2012,6(7):488-496.
[6]郭苗军,曾军,李晋红.基于螺旋相位板的涡旋波束的产生与干涉[J].激光与光电子学进展,2016,53(9):092602.
[7]YANG C H,FUH A Y.Complex beam shaping based on an equivalent q-plate system and analysis of its properties using digital holography polarization imaging[J].Scientific Reports,2017,7:2769.
[8]汪慧超,胡阿健,陈培锋.空间光调制器产生拉盖尔-高斯光束方法研究[J].激光技术,2017,41(3):447-450.
[9]MIRHOSSEINI M,MAGANALOAIZA O S,CHEN C C,et al.Rapid generation of light beams carrying orbital angular momentum[J].Optics Express,2013,21(25):30196-30203.
[10]YU N F,GENEVET P,KATS M A,et al.Light propagation with phase discontinuities:generalized laws of reflection and refraction[J].Science,2011,334(6054):333-337.
[11]ZHANG J M,YANG L,LI L P,et al.High-efficiency polarization conversion phase gradient metasurfaces for wideband anomalous reflection[J].Journal of Applied Physics,2017,122(1):014501.
[12]李永花,周璐,赵国忠.基于各向异性超表面的太赫兹宽带偏振转换器[J].中国激光,2018,45(3):0314001.
[13]杨其利,梁兰菊,刘凤收,等.基于太赫兹超材料吸波体的谐振及传感特性研究[J].激光杂志,2018,39(11):62-65.
[14]KARIMI E,SCHULZ S A,LEON I D,et al.Generating optical orbital angular momentum at visible wavelengths using a plasmonic metasurface[J].Light Science&Applications,2014,3:e167.
[15]YANG H T,NIU J Q,ZHANG K,et al.Generating reflective vortex waves in microwave region by metasurface[C]//IEEE International Conference on Electronic Information&Comunication Technology,2016:552-555.
[16]CHANG Z,YOU B,WU L S,et al.A reconfigurable graphene reflectarray for generation of vortex THz waves[J].IEEE Antennas and Wireless Propagation Letters,2016,15:1537-1540.
[17]YU S X,LI L,SHI G M,et al.Design,fabrication,and measurement of reflective metasurface for orbital angular momentum vortex wave in radio frequency domain[J].Applied Physics Letters,2016,108(12):121903.
[18]YU S X,LI L,SHI G M,et al.Generating multiple orbital angular momentum vortex beams using a metasurface in radio frequency domain[J].Applied Physics Letters,2016,108(24):240901.
[19]XU H X,LIU H W,LING X H,et al.Broadband vortex beam generation using multimode Pancharatnam-Berry metasurfaces[J].IEEE Transactions on Antennas and Propagation,2017,65(12):7378-7382.