Inverse Design of Electromagnetic Phase Singularities DOI
Munseong Bae, Haejun Chung, Svetlana V. Boriskina

et al.

2021 7th IEEE International Conference on Network Intelligence and Digital Content (IC-NIDC), Journal Year: 2023, Volume and Issue: unknown, P. 320 - 324

Published: Nov. 3, 2023

The optical vortex has a rapidly changing spatial phase with orbital angular momentum centered by zero electromagnetic field intensity. It opens new strategies for communications, sensing, and imaging systems. Nevertheless, generating high-quality vortices at the appropriate wavelengths polarizations is still challenging. In order to produce vortices, we optimize 2D grating structure nearly perfect absorption via inverse design in this work. We apply an design, broad-area computational optimization method, generate multiple within 300 nmthick silicon. grating-structure-based shows (97.02%). Our maximum purity of as 97.82% mode 1 89.66% -1, which can directly affect quality communication. mechanism may open strategy highquality communication, many other applications.

Language: Английский

Terahertz Metasurface: Non-Diffracting OAM Generation, Multidimensional Multiplexing, and SA-RCS Reduction DOI
Yunping Qi, Hao Li, Mingrui Su

et al.

Journal of Lightwave Technology, Journal Year: 2023, Volume and Issue: 42(5), P. 1526 - 1537

Published: Sept. 27, 2023

In this article, we propose a metasurface element with simple structure and diverse functions. Then, the polarization properties of elements were looked at, simulations using finite method (FEM) used to get surface current electric field distribution, which was confirmed by transmission line theory (TLT). Based on Pancharatnam-Berry (PB) phase method, 3-bit coded 10 gradient designed. Therefore, design can produce maximum non-diffracting distance d max = 1055.265 xmlns:xlink="http://www.w3.org/1999/xlink">μm orbital angular momentum (OAM), incidence angle for xmlns:xlink="http://www.w3.org/1999/xlink">θi ( xmlns:xlink="http://www.w3.org/1999/xlink">f xmlns:xlink="http://www.w3.org/1999/xlink">1 ) 27.22°, xmlns:xlink="http://www.w3.org/1999/xlink">2 31.54°, xmlns:xlink="http://www.w3.org/1999/xlink">3 24.25°, corresponding frequency respectively 2.62 THz, 2.29 2.93 along − xmlns:xlink="http://www.w3.org/1999/xlink">x , xmlns:xlink="http://www.w3.org/1999/xlink">y direction incidence, + xmlns:xlink="http://www.w3.org/1999/xlink">z axis coaxial topological charge xmlns:xlink="http://www.w3.org/1999/xlink">l 4, −1, 2 mode xmlns:xlink="http://www.w3.org/1999/xlink">4 −2 OAM vortex beam, implements 3 × 4 12 orthogonal mode, frequency, multiplexing metasurface, realises multidimensional reuse, channel is uncapped in theory. The aforementioned observation closely tied fundamental property that modes exhibit orthogonality one another. Furthermore, study also examines methodology concept simulated annealing algorithm (SA) relation optimizing application radar cross section (RCS) reduction.

Language: Английский

Citations

6

Single-celled metasurface for labeled vortex beam generator DOI Creative Commons

Congling Liang,

Qi Dai, Tian Huang

et al.

Journal of Materiomics, Journal Year: 2023, Volume and Issue: 10(4), P. 811 - 818

Published: Oct. 21, 2023

Vortex light is a unique beam characterized by spiral phase as it propagates. A fundamental parameter of vortex the topological charge, which determines amount angular momentum and plays crucial role in tailoring its behavior. However, conventional measurement methods for determining such those based on interference modulation, tend to be intricate complex. In this regard, labeled generator proposed, composed metasurface with single-celled configuration. When illuminated designed wavelength, outgoing exhibits structure. Furthermore, charge numbers can directly observed distinct patterns when placed an orthogonal-polarized optical path. With advantages ultra-compactness, high robustness, exceptional precision, proposed significant potential applications communication, manipulation, sensing, etc.

Language: Английский

Citations

6

Inverse design and optical vortex manipulation for thin-film absorption enhancement DOI Creative Commons
Munseong Bae,

Jaegang Jo,

Myunghoo Lee

et al.

Nanophotonics, Journal Year: 2023, Volume and Issue: 12(22), P. 4239 - 4254

Published: Oct. 26, 2023

Optical vortices (OVs) have rapidly varying spatial phase and optical energy that circulates around points or lines of zero intensity. Manipulation OVs offers innovative approaches for various fields, such as sensing, communication, imaging. In this work, we demonstrate the correlation between absorption enhancement in two types structures. First, introduce a simple planar one-dimensional (1D) structure manipulates using coherent light sources. The shows maximum 6.05-fold gap depending on presence OVs. Even slight difference incidence angle can influence generation/annihilation OVs, which implies high sensitivity angular detection. Second, apply inverse design to optimize two-dimensional (2D) perfect ultrathin absorbers. optimized free-form achieves 99.90 % absorptance, fabricable grating 97.85 at 775 nm wavelength. To evaluate OV fields their contribution achieving enhancement, new parameter, circularity. structures generate numerous with circularity 95.37 (free-form) 96.14 (grating), superior our 1D structure. Our study reveals role high-circularity localized optimizing nano-structured absorbers devices many other applications.

Language: Английский

Citations

6

On the design of multi-vortex beam multiplexers using programmable metasurfaces DOI

Behrad Rezaee Rezvan,

Mohammad Yazdi,

Seyed Ehsan Hosseininejad

et al.

Journal of the Optical Society of America B, Journal Year: 2023, Volume and Issue: 40(11), P. 2979 - 2979

Published: Oct. 11, 2023

This paper presents an analytical procedure for designing orbital angular momentum (OAM) multiplexers with the capability of generating multiple multiplexed beams different directions and OAM mode indices. The presented design method provides independent control power each output in a beam. As proof concept, metasurface four incident two scattered modes is designed. It based on 2/2 bits phase–amplitude programmable which numerically simulated, results are good agreement predictions. approach paves way implementation multifunctional devices specially used communication systems.

Language: Английский

Citations

5

Bidirectional multi-mode multiple vortex beams generator based on terahertz metasurface DOI
Huiyun Zhang,

Xiaotong Sang,

Zhenkai Li

et al.

Optics Communications, Journal Year: 2024, Volume and Issue: 558, P. 130371 - 130371

Published: Feb. 9, 2024

Language: Английский

Citations

1

Double-split-ring structure based ultra-broadband and ultra-thin dual-polarization terahertz metasurface with half-reflection and half-transmission DOI Open Access

Dong-Ru Yang,

Yongzhi Cheng, Hui Luo

et al.

Acta Physica Sinica, Journal Year: 2023, Volume and Issue: 72(15), P. 158701 - 158701

Published: Jan. 1, 2023

In this paper, we propose a dual-polarization ultra-wideband metasurface with half-reflection and half-transmission based on double-split-ring (DSR) structure operating in terahertz (THz) frequency range. The designed can simultaneously control the circularly polarized (CP) wave linearly (LP) reflection mode transmission mode, covering an extensive THz unit-cell architecture of consists periodic arrangement DSR made metal, which is affixed to ultra-thin dielectric substrate. By manipulating size rotation direction structure, achieve full phase coverage 0–2π orthogonally LP CP across span 0.3–1.2 THz, encompassing scenarios. relative bandwidths corresponding orthogonal average amplitude 0.45 reach 86% 120%, respectively. Specifically, through numerical simulations, demonstrate that has ability beam deflection vortex generation while reflecting transmitting wave. proposed holds great promise for various applications These findings pave way development flexible versatile devices expanded functionality, thereby opening up new possibilities wavefront manipulation metasurfaces.

Language: Английский

Citations

2

Full space terahertz quasi-non-diffraction vortex beam generation based on a metasurface DOI Creative Commons
Wenqing Liu,

Li Deng,

Shufang Li

et al.

Optical Materials Express, Journal Year: 2023, Volume and Issue: 13(11), P. 3187 - 3187

Published: Sept. 21, 2023

The divergence of orbital angular momentum (OAM) plays a crucial role in practical terahertz OAM applications. However, most the existing research focuses on half-space configurations, which significantly limit utilization space and are not aligned with future development wireless communication. In this paper, we present modeling design two broadband high-efficiency janus transmit-reflect metasurfaces (JTRMS). These enable generation quasi-non-diffracting beams carrying forward transmission (FTS), reflection (FRS), backward (BTS). key difference lies polarization characteristics: TRMS1 produces left-handed circularly polarized (LHCP) beam both FTS FRS, while generating right-handed (RHCP) BTS. On other hand, TRMS2 generates LHCP BTS, producing RHCP FRS. This allows for flexible control outgoing waves different spaces. proposed strategy high-performance hold promising application prospects communication systems that require large capacity support multi-directional scenarios.

Language: Английский

Citations

1

Mechanically reconfigurable terahertz polarization converter by coupling-mediated metasurfaces DOI

Zhibo Yao,

Zhaohua Xu, Xiaoyuan Hao

et al.

Chinese Optics Letters, Journal Year: 2024, Volume and Issue: 22(12), P. 123701 - 123701

Published: Jan. 1, 2024

Language: Английский

Citations

0

Gain and mode purity filtering dual polarized OAM beam generation using cavity waveguide-based 3D transmitarray DOI
Yuanxi Cao, Jiahao Zhang, Zhanbiao Yang

et al.

Journal of Physics D Applied Physics, Journal Year: 2024, Volume and Issue: 57(24), P. 245101 - 245101

Published: March 7, 2024

Abstract A 3D transmitarray (TA) is proposed to generate dual-polarized orbital angular momentum (OAM) beams with gain and mode purity filtering responses. The TA units are realized by square cavity filters the same passband different orders inner widths, resulting in coupling numbers. evanescent modes cavities will greatly decrease propagation constant, thus generating a large phase variation. structure of filter makes it able support wave delay insert loss. Based on these transmission characteristics, eight designed realize 3-bit gradient within 25.4–26.7 GHz. It should be emphasized that dispersed magnitude stopbands deteriorate OAM beam. Therefore, responses can simultaneously. In order verify performance design, prototype number l = −1 fabricated printing technology. maximum 25.9 dB passband, rejection level below −15.0 main beam direction. purities over 0.5 cross-polarization −16.5 dB. advantages TA, including gain-filtering purity-filtering responses, dual-polarization, high efficiency make promising solution for millimeter-wave sensing communication applications.

Language: Английский

Citations

0

Dynamic light manipulation by geometric phase metasurface incorporated to Tamm plasmon polariton structure DOI
Rashid G. Bikbaev,

Yuri V. Konov,

Dmitrii A. Pykhtin

et al.

Chinese Journal of Physics, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 1, 2024

Language: Английский

Citations

0