High-Efficiency Microwave Wireless Power Transmission via Reflective Phase Gradient Metasurfaces and Surface Wave Aggregation

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(44), P. 60189 - 60196

Published: Oct. 23, 2024

Microwave Wireless Power Transfer (MWPT) technology is crucial for emergency power supply during natural disasters and powering off-grid equipment. Traditional antenna arrays, however, suffer from low energy capture efficiency, difficult impedance matching, complex synthetic networks, intricate manufacturing processes. This paper introduces a microwave receiver design utilizing Reflective Phase Gradient Metasurfaces (R-PGMs) surface wave convergence technology. The leverages the effective plane wave-to-surface conversion capability of R-PGMs to transform incident into mode, which then efficiently harvested using circular array before being output coupling port. By optimizing R-PGM parameters, an ideal 60° phase gradient distribution achieved, facilitating focus via dispersion characteristics. These components are integrated hybrid array, complemented by matched port structure. Numerical simulations show that this can convert waves waves, achieving efficiency 85.32% collection 68.26%. Experimental results corroborate these findings, with peak reaching 64.68% at 5.8 GHz RF-DC 42%, confirming design's efficacy. Compared conventional methods, simplifies system avoiding combining networks significantly enhances MWPT.

Language: Английский

---

TiN-Only Metasurface Absorber for Solar Energy Harvesting

Photonics, Journal Year: 2025, Volume and Issue: 12(5), P. 443 - 443

Published: May 3, 2025

With global energy demand surging and traditional resources diminishing, the solar absorber featuring optimized design shows substantial potential in areas like power generation. This study proposes a that is insensitive to wide-angle incidence polarization. It has cylindrical structure with square holes, which constructed from titanium nitride (TiN). The calculation results indicate that, for plane waves, average absorption of this across wavelength range 300–2500 nm reaches 92.4%. Moreover, its rate spectrum corresponding AM1.5 94.8%. analysis characteristics within electric magnetic field profiles indicates superior properties arise cooperative resonance effect. effect originates interaction among surface plasmon resonance, guided-mode cavity resonance. In study, geometric parameters absorber’s significantly influence performance. Therefore, we these obtain optimal values. Even at large incident angle, maintains high performance insensitivity polarization angle. findings expected are likely be considerable practical importance realm photothermal conversion.

Language: Английский

---

High‐Resolution Phase‐Magnitude‐Decoupled Information Metasurface for Complex Beamforming and Dual Channel 16QAM Secure Communication

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: May 15, 2025

Abstract Information metasurfaces have attracted considerable attention due to their remarkable ability tailor electromagnetic (EM) waves flexibly. However, it is still challenging achieve high‐resolution phase‐magnitude‐decoupled modulations with high integration and more degrees of freedom in 2D. In this work, a low‐profile information metasurface (PMDIM) proposed that enables independent controls both phase magnitude. By precisely applying different bias voltages two groups PIN diodes the PMDIM unit cell, 2‐bit responses continuous magnitude control ranging from 0.2 1 across wide bandwidth are achieved unit‐by‐unit manner, offering 2D capability for EM manipulations. For validation, combined carefully optimized phase‐magnitude coding sequences realize functions: complex beamforming dual‐channel 16QAM secure communication. The first function includes single‐beam steering low sidelobes, dual‐beam power allocation, multi‐beam steering; while second enhances capacity physical layer security wireless systems. Measured results demonstrate excellent performance PMDIM, showing significant potentials modern radar communications.

Language: Английский

---

Metal-insulator-metal (MIM) star-disc nanoantenna for molecular sensing by surface-enhanced infrared absorption (SEIRA) spectroscopy

Surfaces and Interfaces, Journal Year: 2025, Volume and Issue: 57, P. 105758 - 105758

Published: Jan. 1, 2025

Language: Английский

---