Category Ranking
98%
Total Visits
921
Avg Visit Duration
2 minutes
Citations
20
Article Abstract
Highly oriented beam steering will enhance power density and field of view (FOV) in terahertz wireless links. Metasurface can be constructed by deliberate arrangement of subwavelength meta-cells to manipulate the wavefront. This paper explores a dispersive metasurface with a specific phase gradient patterned in a 2-inch aperture, allowing for collimated beamforming and two-dimensional (2D) beam steering by a combination of frequency tuning and metasurface rotation. The metasurface is directly fed by a horn antenna, ensuring a compact integration. Simulation and experiment in the 80-110 GHz band revealed that the gain band crucial for FOV and efficiency is mainly constrained by the nonlinear phase dispersion of the meta-cells. Efforts to optimize the phase linearity resulted in a more efficient metasurface with a gain of 35.7 dBi and an efficiency of 76.6% at 400 GHz. A FOV of 22.5° in the elevation was guaranteed with gain in the 325-500 GHz band (a bandwidth of 42.4%). Imaging of two scattering balls was demonstrated at a distance of 4.1 meters by using the metasurface for 2D beam steering.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1364/OE.532030 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Frequency modulated continuous wave LiDAR with expanded field-of-view based on polarization-splitting metasurface.
Nanophotonics
August 2025
National Laboratory of Solid State Microstructures, Key Laboratory of Intelligent Optical Sensing and Manipulation, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, C ollaborative Innovation Center of Advanced Microstructures, Nanjing University
Frequency modulated continuous wave (FMCW) light detection and ranging (LiDAR) has recently become a research hotspot in the fields of autonomous driving and intelligent perception due to its high-precision ranging and velocity measurement capabilities. However, the existing LiDAR systems are usually challenged in expanding the field-of-view (FOV), which often comes at the expense of beam quality and degrades the detection accuracy and signal-to-noise ratio. On the other hand, the complexity of data processing algorithms may introduce significant measurement inaccuracies, potentially leading to substantial deviations in the final results.
View Article and Find Full Text PDFPhotonic terahertz phased array via selective excitation of nonlinear Pancharatnam-Berry elements.
Nat Commun
September 2025
State Key Laboratory of Precision Measurement Technology and Instruments, Tianjin University, Tianjin, China.
Phased arrays are crucial in various technologies, such as radar and wireless communications, due to their ability to precisely control and steer electromagnetic waves. This precise control improves signal processing and enhances imaging performance. However, extending phased arrays to the terahertz (THz) frequency range has proven challenging, especially for high-frequency operation, broadband performance, two-dimensional (2D) phase control with large antenna arrays, and flexible phase modulation.
View Article and Find Full Text PDFActive time-reversal based phased array ultrasound system for accurate focusing through biological tissue layers.
Discov Nano
September 2025
Department of Radiology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China.
Ultrasonic phased array technology enables flexible and controllable beamforming through precise phase delay control of individual array elements in the transducer, facilitating dynamic focusing, beam steering, and beamforming. This study presents a 64-channel system achieving 1 ns delay resolution using FPGA-based phase-locked loops. Through systematic testing and calibration of the delay error in the phased array transmission driving system, the actual delay error was successfully controlled within 1 ns.
View Article and Find Full Text PDFUnderstanding Patient Priorities for Religious and Spiritual Needs During Radiation Therapy for Gynecological Malignancies.
Pract Radiat Oncol
August 2025
Department of Radiation Oncology, NYU Langone Health, New York, New York. Electronic address:
Purpose: Addressing religion and spirituality (R/S) in the patient care setting has shown associations with health care outcomes and quality of life. Patients with gynecologic malignancies demonstrate increased distress and fear following treatment. The Faith or belief, Importance and Influence of spirituality, spiritual Community; and interventions to Address spiritual needs (FICA) Spiritual History Tool outlines 4 domains of assessment.
View Article and Find Full Text PDFAll-optically controlled phased-array for ultrasonics.
Nat Commun
August 2025
Max Planck Institute for Medical Research, Heidelberg, Germany.
The ability to dynamically shape ultrasound fields is critical for emerging applications in therapeutic ultrasound, particle manipulation and tissue engineering. While existing phased arrays provide beam steering for imaging, these newer applications require higher intensities. This complicates the electrical driving and ultimately limits the array size and spatial complexity of the field.
View Article and Find Full Text PDF