Chinese Optics Letters, Год журнала: 2024, Номер 22(12), С. 123701 - 123701
Опубликована: Янв. 1, 2024
Язык: Английский
Physica B Condensed Matter, Год журнала: 2024, Номер 681, С. 415848 - 415848
Опубликована: Март 15, 2024
Язык: Английский
Процитировано
40
Applied Energy, Год журнала: 2024, Номер 372, С. 123807 - 123807
Опубликована: Июль 1, 2024
Язык: Английский
Процитировано
9
Laser & Photonics Review, Год журнала: 2024, Номер 18(10)
Опубликована: Май 9, 2024
Abstract Seeking new ways to actively control the phase using metasurfaces has gained significant attention in recent years, which is key achieve controllable wavefronts under external stimuli. Among various active mechanisms, a mechanical method based on gap tuning, termed as gap‐tuned metasurface here, shown promise continuous adjustment. However, previous studies face limitations independent and complete at different distances, crucial dual‐function switching applications. In this study, novel type of are proposed, can overcome above through simultaneously manipulating Pancharatnam–Berry gap‐induced dynamic circularly polarized incidences. Two exemplary capable orbital angular momentum (OAM) focusing‐polarity experimentally demonstrated. Furthermore, special design also exhibits conjugate property similar phase, making circular polarization handedness an alternative route for switching. This provides straightforward effective means development wavefront devices.
Язык: Английский
Процитировано
2
Micromachines, Год журнала: 2024, Номер 15(2), С. 219 - 219
Опубликована: Янв. 31, 2024
Actuators play a crucial role in microelectromechanical systems (MEMS) and hold substantial potential for applications various domains, including reconfigurable metamaterials. This research aims to design, fabricate, characterize structures the actuation of EMA. The electromagnetic actuator overcomes lack high drive voltage required by other actuators. proposed configuration comprises supporting cantilever beams with fixed ends, an integrated coil positioned above cantilever's movable plate, permanent magnet located beneath plate generate static magnetic field. Utilizing flexible polyimide, fabrication process EMA is simplified, overcoming limitations associated silicon-based micromachining techniques. Furthermore, this approach potentially enables large-scale production EMA, displacement reaching up 250 μm under 100 mA current, thereby expanding their scope manufacturing. To demonstrate function we it metamaterial structure form compact, tunable terahertz absorber, demonstrating space.
Язык: Английский
Процитировано
1
Photonics Research, Год журнала: 2024, Номер 12(5), С. 1044 - 1044
Опубликована: Март 4, 2024
The terahertz regime is widely recognized as a fundamental domain with significant potential to address the demands of next-generation wireless communications. In parallel, mode division multiplexing based on orbital angular momentum (OAM) shows promise in enhancing bandwidth utilization, thereby expanding overall communication channel capacity. this study, we present both theoretical and experimental demonstrations an on-chip OAM demultiplexer. This device effectively couples steers seven incident vortex beams into distinct high-quality focusing surface plasmonic beams, directions can be arbitrarily designated. proposed design strategy integrates space-to-chip conversion, recognition, routing compact space subwavelength thickness, exhibiting versatility superior performance.
Язык: Английский
Процитировано
1
Journal of Physics Conference Series, Год журнала: 2024, Номер 2740(1), С. 012002 - 012002
Опубликована: Апрель 1, 2024
Abstract Terahertz metamaterial absorbers are typically comprised of an array sub-wavelength meta-atoms, a dielectric spacer layer and ground plane. The absorption quality factor two the most important performance metrics for various advanced applications, such as THz communication, sensing, imaging. However, large number structural parameters in meta-atom make design approach based on physical intuition parameter sweep impractical difficult. In this paper, we report intelligent methodology genetic algorithm that facilitates optimization air-spaced terahertz absorber to improve its factor. presented starts by randomly generating size meta-atom, it iteratively obtains optimized dual narrow band perfect absorber. near unity-absorption peaks 23.8 at 0.5 60.3 0.7 THz, respectively. device was fabricated using surface bulk-micromachining processes, measured spectra agrees well with simulated results. Not limited proof-of-concept demonstration, can be applied all metamaterial-based photonic systems achieving efficient forward design.
Язык: Английский
Процитировано
1
Frontiers of Optoelectronics, Год журнала: 2024, Номер 17(1)
Опубликована: Июнь 12, 2024
In recent years, graphene Field-Effect-Transistors (GFETs) have demonstrated an outstanding potential for Terahertz (THz) photodetection due to their fast response and high-sensitivity. Such features are essential enable emerging THz applications, including 6G wireless communications, quantum information, bioimaging security. However, the overall performance of these photodetectors may be utterly compromised by impact internal resistances presented in device, so-called access or parasitic resistances. this work, we provide a detailed study influence device photoresponse high-mobility dual-gate GFET detectors. architectures allow us fine tune (decrease) resistance order magnitude consequently demonstrate improved responsivity noise-equivalent-power values photodetector, respectively. Our results can well understood series model, as shown excellent agreement found between experimental data theoretical calculations. These findings therefore relevant understand improve existing photodetectors.
Язык: Английский
Процитировано
1
Laser & Photonics Review, Год журнала: 2024, Номер unknown
Опубликована: Июль 24, 2024
Abstract Terahertz (THz) metasurfaces have emerged as a powerful tool for manipulating THz wavefronts, typically achieved by adjusting various geometric parameters. In this study, an approach is introduced incorporating interlayer coupling into twisted stacking metasurface design to completely control the amplitude and phase of circularly polarized waves. By leveraging effect Pancharatnam–Berry phase, study achieves efficient over transmission simply relative twist angle between paired C‐shaped split‐ring resonators. To validate concept, holographic fabricated characterized, providing experimental evidence its wavefront manipulation capabilities. This strategy presents versatile tunable solution wave control, promising applications in wide range functional devices.
Язык: Английский
Процитировано
1
Опубликована: Янв. 21, 2024
This paper reports a microelectromechanical system (MEMS) reconfigurable metamaterial based dynamic terahertz beam deflector enabled by changing the ultra-subwavelength air gap between metallic resonator array and Au ground plane. In comparison to tunable metamaterials on modifying constituent material properties, our MEMS-based devices can improve THz steering efficiency modulation depth of deflection coefficient. The device was fabricated combination surface bulk silicon micromachining processes. MEMS air-spaced (ASM) demonstrated may potentiate various applications, such as next-generation wireless communication space technology.
Язык: Английский
Процитировано
0
Advanced Optical Materials, Год журнала: 2024, Номер 12(17)
Опубликована: Март 14, 2024
Abstract Directional radiofrequency (RF) sensing, also known as radio direction finding, is essential in various applications that involve localizing RF sources. However, existing sensing technologies face challenges due to their large antenna sizes and complex signal processing circuits, which hinder the realization of miniaturized subwavelength sensors. In this article, a non‐Hermitian broadside coupled split ring resonators (BC‐SRRs) are presented, can identify an incident with angles ranging from 0° 180°. The Hamiltonian system, be interpreted by temporal mode theory, gives rise asymmetric resonant modes BC‐SRRs. asymmetry allows direct measurement wave angle probing strength two For proof concept, one‐stage Dickson voltage multiplier employed rectify signals demonstrate ability relating rectified angle. results showcase potential proposed technique using BC‐SRRs pathway toward antenna‐based finding.
Язык: Английский
Процитировано
0