Functional Metasurface Quarter-Wave Plates for Simultaneous Polarization Conversion and Beam Steering

ACS Nano ◽  
2021 ◽  
Author(s):  
Yadong Deng ◽  
Cuo Wu ◽  
Chao Meng ◽  
Sergey I. Bozhevolnyi ◽  
Fei Ding
Keyword(s):  
Beam Steering ◽  
Polarization Conversion ◽  
Quarter Wave

scholarly journals Switchable Metasurface with VO2 Thin Film at Visible Light by Changing Temperature

Photonics ◽  
2021 ◽  
Vol 8 (2) ◽  
pp. 57 ◽  
Author(s):  
Jin-Kyu Yang ◽  
Hyeon-Seok Jeong
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Optical Sensors ◽  
Beam Steering ◽  
Incident Light ◽  
Visible Region ◽  
Polarization Conversion ◽  
Temperature Dependent ◽  
Beamforming Antennas ◽  
Change Material

We numerically demonstrated switchable metasurfaces using a phase change material, VO2 by temperature change. The Pancharatnam–Berry metasurface was realized by using an array of Au nanorods on top of a thin VO2 film above an Au film, where the optical property of the VO2 film is switched from the insulator phase at low temperature to the metal phase at high temperature. At the optimal structure, polarization conversion efficiency of the normal incident light is about 75% at low temperature while that is less than 0.5% at high temperature in the visible region (λ∼ 700 nm). Various functionalities of switchable metasurfaces were demonstrated such as polarization conversion, beam steering, Fourier hologram, and Fresnel hologram. The thin-VO2-film-based switchable metasurface can be a good candidate for various switchable metasurface devices, for example, temperature dependent optical sensors, beamforming antennas, and display.

scholarly journals Full 360∘ Terahertz Dynamic Phase Modulation Based on Doubly Resonant Graphene-Metal Hybrid Metasurfaces

2021 ◽  
Author(s):  
Binxu Wang ◽  
Xiaoqing Luo ◽  
Yalin Lu ◽  
Guangyuan Li
Keyword(s):  
Fermi Energy ◽  
Phase Modulation ◽  
Beam Steering ◽  
Polarization Conversion ◽  
Terahertz Waves ◽  
Dynamic Phase ◽  
Phase Profile ◽  
Profile Design ◽  
Simulation Results ◽  
High Reflectance

Dynamic phase modulation is vital for tunable focusing, beaming, polarization conversion and holography. However, it remains challenging to achieve full 360∘ dynamic phase modulation while maintaining high reflectance or transmittance based on metamaterials or metasurfaces in the terahertz regime. Here we propose a doubly resonant graphene-metal hybrid metasurface to address this challenge. Simulation results show that by varying the graphene Fermi energy, the proposed metasurface with two shifting resonances is capable to provide dynamic phase modulation covering a range of 361∘ while maintaining relatively high reflectance above 20% at 1.05 THz. Based on the phase profile design, dynamically tunable beam steering and focusing are numerically demonstrated. We expect this work will advance the engineering of graphene metasurfaces for the dynamic manipulation of terahertz waves.

Measurement of beam steering and RF defocusing effect for a quarter-wave resonator

2019 ◽  
Vol 28 (03) ◽  
pp. 1950019
Author(s):  
Yuanshuai Qin ◽  
Zhijun Wang ◽  
Huan Jia ◽  
Yuan He ◽  
Penghui Gao ◽  
...  
Keyword(s):  
Beam Steering ◽  
Proton Accelerator ◽  
Central Position ◽  
Linear Accelerators ◽  
Simulation Code ◽  
Beam Position ◽  
Quarter Wave Resonator ◽  
Wave Resonator ◽  
Modern Physics ◽  
Quarter Wave

Quarter-wave resonators (QWRs) are being widely used in linear accelerators (linac) for acceleration of ions with low-[Formula: see text] velocity. Two effects of this kind of cavities are beam steering effect and RF defocusing effect caused by geometric asymmetry. Measurement for the two effects has been conducted by using beam position monitors (BPMs) and wires for a QWR type buncher whose frequency is 162.5[Formula: see text]MHz at Institute of Modern Physics (IMP), Chinese Academy of Sciences (CAS). Since experiment and simulation matches well, beam central position and beam envelope could be predicted in simulation code, which is beneficial for high-intensity proton accelerator design and commissioning.

Metasurface-enabled broadband beam splitters integrated with quarter-wave plate functionality

Nanoscale ◽  
2020 ◽  
Vol 12 (26) ◽  
pp. 14106-14111 ◽  
Author(s):  
Fei Ding ◽  
Rucha Deshpande ◽  
Chao Meng ◽  
Sergey I. Bozhevolnyi
Keyword(s):  
Linear Polarization ◽  
Quarter Wave Plate ◽  
Power Splitting ◽  
Polarization Conversion ◽  
Beam Splitters ◽  
Wave Plate ◽  
Quarter Wave

Metasurface-enabled broadband beam splitters integrated with quarter-wave plate functionality for simultaneous power splitting and circular-to-linear polarization conversion have been demonstrated.

scholarly journals A triple-band antenna array for next-generation wireless and satellite-based applications

2014 ◽  
Vol 8 (1) ◽  
pp. 71-80 ◽  
Author(s):  
Asghar A. Razzaqi ◽  
Bilal A. Khawaja ◽  
Mehrab Ramzan ◽  
Muhammad Javed Zafar ◽  
Syeda Areeba Nasir ◽  
...  
Keyword(s):  
Antenna Array ◽  
Antenna Arrays ◽  
Beam Steering ◽  
Optimization Techniques ◽  
Single Element ◽  
Next Generation ◽  
Antenna Performance ◽  
Quarter Wave ◽  
Wave Transformer ◽  
Triple Band

In this paper, a triple-band 1 × 2 and 1 × 4 microstrip patch antenna array for next-generation wireless and satellite-based applications are presented. The targeted frequency bands are 3.6, 5.2 and 6.7 GHz, respectively. Simple design procedures and optimization techniques are discussed to achieve better antenna performance. The antenna is designed and simulated using Agilent ADS Momentum using FR4 substrate (εr= 4.2 and h = 1.66 mm). The main patch of the antenna is designed for 3.6 GHz operation. A hybrid feed technique is used for antenna arrays with quarter-wave transformer-based network to match the impedance from the feed-point to the antenna to 50 Ω. The antenna is optimized to resonate at triple-bands by using two symmetrical slits. The single-element triple-band antenna is fabricated and characterized, and a comparison between the simulated and measured antenna is presented. The achieved simulated impedance bandwidths/gains for the 1 × 2 array are 1.67%/7.75, 1.06%/7.7, and 1.65%/9.4 dBi and for 1 × 4 array are 1.67%/10.2, 1.45%/8.2, and 1.05%/10 dBi for 3.6, 5.2, and 6.7 GHz bands, respectively, which are very practical. These antenna arrays can also be used for advanced antenna beam-steering systems.

Beam steering correction of the quarter wave resonator in the HISCL

2014 ◽  
Vol 38 (10) ◽  
pp. 107007
Author(s):  
Shu-Hui Liu ◽  
Zhi-Jun Wang ◽  
Cong Zhang ◽  
Yuan He
Keyword(s):  
Beam Steering ◽  
Quarter Wave Resonator ◽  
Wave Resonator ◽  
Quarter Wave
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