Dielectric Meta-Reflectarray for Broadband Linear Polarization Conversion and Optical Vortex Generation

Nano Letters ◽  
2014 ◽  
Vol 14 (3) ◽  
pp. 1394-1399 ◽  
Author(s):  
Yuanmu Yang ◽  
Wenyi Wang ◽  
Parikshit Moitra ◽  
Ivan I. Kravchenko ◽  
Dayrl P. Briggs ◽  
...  
Keyword(s):  
Linear Polarization ◽  
Optical Vortex ◽  
Polarization Conversion ◽  
Vortex Generation

Broadband linear polarization conversion based on the coupling of bilayer metamaterials in the terahertz region

2017 ◽  
Vol 383 ◽  
pp. 310-315 ◽  
Author(s):  
Rui Xia ◽  
Xufeng Jing ◽  
Huihui Zhu ◽  
Weimin Wang ◽  
Ying Tian ◽  
...  
Keyword(s):  
Linear Polarization ◽  
Polarization Conversion ◽  
Terahertz Region

scholarly journals Arbitrary polarization conversion for pure vortex generation with a single metasurface

Nanophotonics ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 727-732
Author(s):  
Marco Piccardo ◽  
Antonio Ambrosio
Keyword(s):  
Angular Momentum ◽  
Polarization Conversion ◽  
Vortex Beam ◽  
Vortex Generation ◽  
Optical Elements ◽  
Amplitude Control ◽  
Cavity Resonators ◽  
Vortex Beams ◽  
Topological Charges ◽  
Selection Of

AbstractThe purity of an optical vortex beam depends on the spread of its energy among different azimuthal and radial modes, also known as $\ell $- and p-modes. The smaller the spread, the higher the vortex purity and more efficient its creation and detection. There are several methods to generate vortex beams with well-defined orbital angular momentum, but only few exist allowing selection of a pure radial mode. These typically consist of many optical elements with rather complex arrangements, including active cavity resonators. Here, we show that it is possible to generate pure vortex beams using a single metasurface plate—called p-plate as it controls radial modes—in combination with a polarizer. We generalize an existing theory of independent phase and amplitude control with birefringent nanopillars considering arbitrary input polarization states. The high purity, sizeable creation efficiency, and impassable compactness make the presented approach a powerful complex amplitude modulation tool for pure vortex generation, even in the case of large topological charges.

High-order optical vortex generation in a few-mode fiber via cascaded acoustically driven vector mode conversion

2016 ◽  
Vol 41 (21) ◽  
pp. 5082 ◽  
Author(s):  
Wending Zhang ◽  
Ligang Huang ◽  
Keyan Wei ◽  
Peng Li ◽  
Biqiang Jiang ◽  
...  
Keyword(s):  
Mode Conversion ◽  
Optical Vortex ◽  
High Order ◽  
Vortex Generation ◽  
Vector Mode

scholarly journals External pressure induced liquid crystal defects for optical vortex generation

AIP Advances ◽  
2018 ◽  
Vol 8 (6) ◽  
pp. 065219
Author(s):  
L. K. Migara ◽  
Heesu Lee ◽  
Cheon-Myeong Lee ◽  
Keumcheol Kwak ◽  
Doyeon Lee ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Optical Vortex ◽  
External Pressure ◽  
Crystal Defects ◽  
Vortex Generation

Digitized subwavelength surface structure on silicon platform for wavelength-/polarization-/charge-diverse optical vortex generation

2020 ◽  
Author(s):  
Xiaoping Cao ◽  
Nan Zhou ◽  
Shuang Zheng ◽  
Shengqian Gao ◽  
Yuntao Zhu ◽  
...  
Keyword(s):  
Surface Structure ◽  
Optical Communications ◽  
Vortex Generator ◽  
Optical Vortex ◽  
Vortex Generation ◽  
Worst Case ◽  
Additional Degree ◽  
Direct Binary Search ◽  
Polarization Charge ◽  
Narrow Bandwidth

Abstract Optical vortices carrying orbital angular momentum (OAM) have recently attracted increasing interest for providing an additional degree of freedom for capacity scaling in optical communications. The optical vortex generator is an essential component to facilitate OAM-enabled optical communications. Traditional devices face challenges of limited compactness, narrow bandwidth and first-order OAM modes. Here, using the direct-binary search (DBS) optimization algorithm, we design, fabricate and demonstrate a digitized subwavelength surface structure on silicon platform for wavelength-/polarization-/charge-diverse optical vortex generation. It features an ultra-compact footprint (~3.6×3.6 μm 2 ) and ultra-wide bandwidth (1480-1630 nm), supporting two polarizations and high-order OAM modes (OAM +1 , OAM -1 , OAM +2 , OAM -2 ) with high purity of ~90%. The mode crosstalk matrix is measured in the experiment with favorable performance. When generating x-pol. OAM +1 , x-pol. OAM -1 , y-pol. OAM +1 and y-pol. OAM -1 , the crosstalk of the worst case is less than -14 dB. When generating OAM +1 , OAM -1 , OAM +2 and OAM -2 , the crosstalk between any two OAM modes is less than -10 dB, and the lowest crosstalk is about -17 dB. The wavelength-/polarization-/charge-diverse optical vortex generator enables the full access of multiple physical dimensions (wavelength, polarization, space) of lightwaves. The demonstrations may open up new perspectives for chip-scale solutions to multi-dimensional multiplexing optical communications.

Linear polarization conversion of transmitted terahertz wave with double-layer meta-grating surfaces

2018 ◽  
Vol 16 (8) ◽  
pp. 081601 ◽  
Author(s):  
Han Sun Han Sun ◽  
Yaxin Zhang Yaxin Zhang ◽  
Kailong Wang Kailong Wang ◽  
Yuncheng Zhao Yuncheng Zhao ◽  
Wei Kou Wei Kou ◽  
...  
Keyword(s):  
Double Layer ◽  
Linear Polarization ◽  
Terahertz Wave ◽  
Polarization Conversion

Plasmonic planar antenna for wideband and efficient linear polarization conversion

2014 ◽  
Author(s):  
Quentin Lévesque ◽  
Mathilde Makhsiyan ◽  
Patrick Bouchon ◽  
Fabrice Pardo ◽  
Julien Jaeck ◽  
...  
Keyword(s):  
Linear Polarization ◽  
Planar Antenna ◽  
Polarization Conversion

Optical vortex generation from a diode-pumped alexandrite laser

2018 ◽  
Vol 15 (4) ◽  
pp. 045804 ◽  
Author(s):  
G M Thomas ◽  
A Minassian ◽  
M J Damzen
Keyword(s):  
Optical Vortex ◽  
Vortex Generation ◽  
Alexandrite Laser ◽  
Diode Pumped

scholarly journals A metasurface composed of 3-bit coding linear polarization conversion elements and its application to RCS reduction of patch antenna

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Xiangkun Kong ◽  
Qi Wang ◽  
Shunliu Jiang ◽  
Lingqi Kong ◽  
Jing Yuan ◽  
...  
Keyword(s):  
Equivalent Circuit ◽  
Linear Polarization ◽  
Patch Antenna ◽  
Polarization Conversion ◽  
Electrical Behavior ◽  
Amplitude Response ◽  
Coding Sequence ◽  
Unit Cells ◽  
Simulation And Experiment ◽  
Equivalent Circuit Models

Abstract In this paper, a metasurface composed of 3-bit coding linear polarization conversion elements and its application to RCS reduction of the patch antenna is intensively studied. At first, 3-bit coding metasurface are constructed by a sequence of eight coded unit cells, which have a similar cross-polarized reflected amplitude response and gradient reflected phase responses covering 0–2π, respectively. Equivalent circuit models of these unit cells are created to describe their electrical behavior for the two linear incident polarizations at the same time. Then, a patch antenna is integrated on the 3-bit metasurface, of which the elements are placed with a 2-dimensional linear coding sequence. The metal square ring is set around the patch antenna to protect it from the disturbance of metasurface. Both the simulation and experiment results demonstrate that the designed metasurface can primarily reduce the antenna RCS at a broadband, while the antenna performances are not degraded significantly.

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