Joint time-frequency analysis on space-time-coding digital metasurfaces

Chen, Xiao Qing; Zhang, Lei; Zheng, Yi Ning; Huang, Zhuo Ran; Liang, Jinxing; Cui, Tiejun

doi:10.1088/2515-7647/acadc1

Cited by 3 publications

(2 citation statements)

References 45 publications

(55 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…By controlling the variation of characterization parameters of metasurfaces in the spatial and time domains, many novel physical phenomena that traditional space-modulated metasurfaces cannot achieve have emerged. Due to the introduction of time-varying parameter manipulation, time modulation of metasurfaces greatly expands their application range [142,143,[163][164][165][166].…”

Section: Time-modulated Metasurfacesmentioning

confidence: 99%

Recent advances in electromagnetic metamaterials and metasurfaces for polarization manipulation

Shao,

Zhu

2024

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

Polarization is an important characteristic of electromagnetic waves that has been exploited in many areas of wave manipulations. While effective control of polarization is highly demanded in various applications, traditional polarization converters have drawbacks such as large volume, narrow operating frequency band, low efficiency, and high losses, hindering themselves from practical applications. Metamaterials and metasurfaces are recently developed artificially structured electromagnetic materials constructed by three- or two-dimensional arrays of meta-atoms with tailored electromagnetic responses, exhibit great potential in controlling the propagation of electromagnetic waves and are highly suitable for flexible control of polarization. Here, we review the recent developments in the field of electromagnetic metamaterials and metasurface for polarization manipulation, focusing on their operation principles and practical applications. We discussed the research progress of chiral metamaterials and anisotropic metasurfaces, and also summarized the achievements of metasurfaces for comprehensive manipulation polarization and phase in recent years. We further summarize the recent achievements on the diversified polarization manipulation functions of metasurfaces. Finally, we discuss reconfigurable metasurfaces that can dynamically control the polarizaiton and wavefronts of electromagnetic waves, including not only electrically reconfigurable metasurfaces with constitutional meta-atoms locally tuned by external stimuli, but also time-modulated metasurfaces exploiting the temporal dimension by applying dynamic switching of the coding sequences. Finally, we look forward to the possible future directions and existing challenges in this rapidly developing field.

show abstract

Section: Time-modulated Metasurfacesmentioning

confidence: 99%

Recent advances in electromagnetic metamaterials and metasurfaces for polarization manipulation

Shao,

Zhu

2024

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

show abstract

“…This approach introduces an extra dimension of control -time -leading to unparalleled capabilities in wave manipulation and the discovery of intriguing physical phenomena and applications. [26][27][28][29][30][31][32][33][34] In 2018, we put forward the concept of space-time-coding (STC) digital metasurfaces, building upon the digital programmable metasurface platform. [35] By dynamically switching the elements' constitutive parameters (e.g., amplitudes and/or phases) in both space and time, we demonstrated that STC digital metasurfaces can simultaneously manipulate waves and information in spatial and frequency domains.…”

Section: Introductionmentioning

confidence: 99%

Co‐Prime Modulation for Space‐Time‐Coding Digital Metasurfaces with Ultralow‐Scattering Characteristics

Zhang,

Huang,

Chen

et al. 2024

Adv Funct Materials

Self Cite

View full text Add to dashboard Cite

Multi‐dimensional modulation of electromagnetic (EM) waves is critical in various fields such as electronic and photonic systems. Space‐time‐coding (STC) digital metasurfaces, an innovative platform for programmable metasurfaces, offer a straightforward and robust solution for spatio‐temporal modulation, thereby enabling EM‐wave manipulations in both space and frequency. Conventional STC schemes rely on periodic temporal modulations that are uniform in space (i.e., with same modulation frequency in all metasurface elements), and therefore do not take advantage of spatio‐temporal coupling effects that can be induced by non‐uniform periodic modulations (i.e., with different modulation frequencies across the metasurface elements). Here, a novel approach involving non‐uniform spatio‐temporal modulation, alongside co‐prime modulation, is introduced. This approach enhances the fundamental principles of STC digital metasurfaces and facilitates the synthesis of angular scattering responses across different frequencies, guided by harmonic coupling conditions. The proposed strategy results in a more even distribution of the scattered intensity in both space and frequency. For validation, an experimental proof‐of‐principle for spatial‐spectral diffuse scattering is presented. The experimental outcomes align closely with theoretical predictions, underscoring the effectiveness of co‐prime modulation in achieving ultralow‐scattering characteristics in STC digital metasurfaces. Moreover, this technique holds promise for applications in secure wireless communications, radar jamming, and complex beamforming.

show abstract

Continuous manipulation of electromagnetic radiation based on ultrathin flexible frequency coding metasurface

Jia,

Zhao,

Tang

et al. 2024

Sci Rep

View full text Add to dashboard Cite

The physical characteristics of electromagnetic waves are combined with digital information in coding metasurfaces. Coding metasurfaces enable precise control of beams by flexibly designing coding sequences. However, achieving continuous multivariate modulation of electromagnetic waves on passive flexible coded metasurfaces remains a challenge. Previous passive coding metasurfaces have a fixed phase difference between adjacent coding units throughout the operating frequency band, and when the coding pattern is defined, the coded metasurface can only achieve a single electromagnetic function. Our proposed frequency coding metasurface units vary linearly in phase difference over the operating frequency band with different phase sensitivities. Frequency coding metarsurfaces enable a wide range of tunable and versatile electromagnetic energy radiation, without introducing any active devices and changing the coding pattern. As a demonstration of the concept, we have shown theoretically and numerically that frequency coding metasurface can achieve successive transformations of electromagnetic functions, including multi-beam generation, anomalous deflection and diffuse scattering. In addition, beam sweeping function is achieved by means of spatially non-periodically distributed frequency coding metasurface. When the frequency of the incident wave is changed, the deflection angle of the beam is also changed. In addition to the tunability of properties, research on coding metasurfaces has tended to be limited to rigid materials. Flexible coding metasurfaces have potential applications in microwave antennas, radar and aircraft. The passive flexible frequency coding metasurfaces provide a novel approach to manipulating electromagnetic waves with increased design flexibility. This promises applications in microwave antennas, radar, aircraft, and satellite communications.

show abstract

Joint time-frequency analysis on space-time-coding digital metasurfaces

Cited by 3 publications

References 45 publications

Recent advances in electromagnetic metamaterials and metasurfaces for polarization manipulation

Recent advances in electromagnetic metamaterials and metasurfaces for polarization manipulation

Co‐Prime Modulation for Space‐Time‐Coding Digital Metasurfaces with Ultralow‐Scattering Characteristics

Continuous manipulation of electromagnetic radiation based on ultrathin flexible frequency coding metasurface

Contact Info

Product

Resources

About