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

и другие.

2021 7th IEEE International Conference on Network Intelligence and Digital Content (IC-NIDC), Год журнала: 2023, Номер unknown, С. 320 - 324

Опубликована: Ноя. 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.

Язык: Английский

Tunable VO2 metasurface for reflective terahertz linear and circular polarization wavefront manipulation at two frequencies independently DOI

HE Yi-qing,

Bin Cai, Ling Wu

и другие.

Physica B Condensed Matter, Год журнала: 2024, Номер 681, С. 415848 - 415848

Опубликована: Март 15, 2024

Язык: Английский

Процитировано

41

Dual-band terahertz reflective-mode metasurface for the wavefront manipulation of independent linear and circular polarization waves DOI
Yongzhi Cheng,

Chenguang Rong,

Jun Li

и другие.

Journal of the Optical Society of America B, Год журнала: 2023, Номер 41(2), С. 341 - 341

Опубликована: Дек. 15, 2023

Metasurfaces (MSs) are being extensively researched owing to their ability modulate the polarization and wavefront of electromagnetic (EM) waves in a flexible manner, which usually offer significant advantages including ultra-thinness, low losses, easy fabrication. However, conventional MSs typically operate well only with single polarization. Here, we propose novel design strategy for terahertz (THz) reflective-mode MS that relies on unit-cell arrangement combining propagation phase geometric phase. Our designed can achieve multiple manipulations reflection mode, not limited circular (CP) transformation, but also enabling linear (LP) conversion. The consists periodic array bilayered metal patterned resonator structures sandwiched by dielectric substrate. metallic is made outer single-split-ring (SSR) C-shaped slot (CSS), inner double-split-ring (DSR), its complementary structure. With this design, capable converting LP wave orthogonal counterpart at lower frequency ( f 1 =0.7THz) after reflection. Additionally, higher 2 =1.4THz), proposed convert right-handed CP (RCP) left-handed (LCP) upon or vice versa. π full coverage be achieved independently simultaneously adjusting opening orientation angles SSR based phase, angle DSR We numerically demonstrate beam deflection, planar focusing, vortex both reflected three representative provide proof concept. These findings reveal great potential multifunctional devices dual-polarization imaging communication systems.

Язык: Английский

Процитировано

29

Temperature tunable broadband filter based on hybridized vanadium dioxide (VO2) metasurface DOI

Dong Wang,

Lingling Yang, Bin Cai

и другие.

Journal of Physics D Applied Physics, Год журнала: 2024, Номер 58(3), С. 035106 - 035106

Опубликована: Окт. 18, 2024

Abstract In this paper, a novel temperature tunable terahertz (THz) broadband filter based on hybridized vanadium dioxide (VO 2 ) metasurface (MS) was proposed. The designed MS is composed of subwavelength metallic square-grid structure situated between two layers square-patch integrated with VO film pad spaced dielectric substrate. Utilizing the insulator-metal phase transition characterizations in THz regime, operation mode proposed accomplishes transmission-to-reflection transition. Simulation results show that when insulating state lower external temperature, behaves like transparent window and transmittance above 80% over frequency range 0.66–1.12 THz. However, undergoes higher becomes low-transmission shielding exhibiting below 10% across spectrum from 0.56 to 1.4 physical mechanism illustrated by introducing impedance matching theory, equivalent circuit model field analysis. addition, offers exceptional angular stability polarization insensitivity, opening up new opportunities for utilization energy selective surface applications.

Язык: Английский

Процитировано

11

Broadband and high-efficient reflective linear–circular polarization convertor based on three-dimensional all-metal anisotropic metamaterial at terahertz frequencies DOI
Nan Li, Jingcheng Zhao,

Peiyi Tang

и другие.

Optics Communications, Год журнала: 2023, Номер 541, С. 129544 - 129544

Опубликована: Май 4, 2023

Язык: Английский

Процитировано

23

All‐Dielectric Terahertz Metasurfaces for Multi‐Dimensional Multiplexing and Demultiplexing DOI
Wanying Liu, Xiaohan Jiang, Quan Xu

и другие.

Laser & Photonics Review, Год журнала: 2024, Номер 18(8)

Опубликована: Март 24, 2024

Abstract Terahertz (THz) communication is an up‐and‐coming technology for the sixth‐generation wireless network. The realization of ultra‐high‐speed THz requires combination multi‐dimensional multiplexing schemes, including polarization division (PDM), mode (MDM), and wavelength multiplexing, to increase channel capacity. However, most existing devices MDM in regime are single‐purpose incapable modulation. Here, all‐dielectric metasurfaces designed 2D multiplexing/demultiplexing, which takes lead combining orbital angular momentum (OAM) PDM regime. multi‐functional wavefront phase modulations interleaved meta‐atom arrangements used realize polarization‐selective multichannel OAM (de)multiplexing, linear‐polarized 4‐channel circular‐polarized 6‐channel demultiplexing experimentally demonstrated. Between different channels, measured maximum crosstalk −16.88 dB, isolation each can be greater than 10 dB a range wider 0.1 THz. This study paves way regime, may benefit extremely high‐capacity integrated systems. proposed design strategy readily applied microwaves far infrared light, facilitating development OAM‐related applications.

Язык: Английский

Процитировано

6

Ultrabroadband chiral metasurface for linear polarization conversion and asymmetric transmission based on enhanced interference theory DOI Open Access
Jingcheng Zhao, Nan Li, Yongzhi Cheng

и другие.

Chinese Optics Letters, Год журнала: 2023, Номер 21(11), С. 113602 - 113602

Опубликована: Янв. 1, 2023

In this paper, we propose an ultrabroadband chiral metasurface (CMS) composed of S-shaped resonator structures situated between two twisted subwavelength gratings and dielectric substrate. This innovative structure enables high-efficiency linear polarization (LP) conversion, as well asymmetric transmission (AT) effect in the microwave region. The enhanced interference Fabry–Perot-like resonance cavity greatly expands bandwidth efficiency LP conversion AT effect. Through numerical simulations, it has been revealed that cross-polarization coefficients for normal forward (-z) backward (+z) incidence exceed 0.8 frequency range 4.13 to 17.34 GHz, accompanied by a ratio over 99%. Furthermore, our experimental results validate consistency among simulation, theory, measurement. Additionally, elucidate distinct characteristics significant through analysis azimuth rotation ellipticity angles, total transmittance, coefficient, electric field distribution. proposed CMS shows excellent properties via potential applications areas such radar, remote sensing, satellite communication.

Язык: Английский

Процитировано

13

Broadband metasurface based on metallic stereo split-ring structure for full-space terahertz beam deflection and focusing effect DOI

Linhui Dong,

Yongzhi Cheng, Hui Luo

и другие.

Materials Today Communications, Год журнала: 2023, Номер 37, С. 107523 - 107523

Опубликована: Ноя. 6, 2023

Язык: Английский

Процитировано

10

An angular stable ultra-broadband asymmetric transmission chiral metasurface with efficient linear-polarization conversion DOI
Afzal Ahmed, Qunsheng Cao, Muhammad Ismail Khan

и другие.

Physica Scripta, Год журнала: 2024, Номер 99(3), С. 035519 - 035519

Опубликована: Фев. 2, 2024

Abstract In this paper, a chiral metasurface is presented to effectively attain an ultra-broadband operation of asymmetric transmission with highly efficient cross-polarization conversion. The efficiency the in frequency band ranging from 6.5 13 GHz above 70%. Additionally, range 3.7 14 GHz, conversion realizes greater than 90% polarization ratio. Asymmetric as well show angular stability against incident angle electromagnetic waves up 45°. To validate simulation results, fabricated tested and compared results. concepts linear-polarization are demonstrated physically explained through distributions surface currents over metallic layers. This anticipated work has significant applications telecommunications radar, potential use equipment designed for manipulation waves.

Язык: Английский

Процитировано

3

Broadband all-metal reflective-mode geometric metasurfaces for visible multi‐functional wavefront manipulation DOI
Qian Pu,

Zhengze Cheng,

Cheng Ni

и другие.

Physica B Condensed Matter, Год журнала: 2023, Номер 666, С. 415097 - 415097

Опубликована: Июль 5, 2023

Язык: Английский

Процитировано

8

Generating broadband nondiffracting perfect vortex beams in the visible regime DOI
Nasir Mahmood,

Muhammad Danial Shafqat,

Muhammad Zubair

и другие.

Journal of materials research/Pratt's guide to venture capital sources, Год журнала: 2023, Номер 38(20), С. 4573 - 4582

Опубликована: Окт. 10, 2023

Язык: Английский

Процитировано

7