Gradient metasurfaces provide a powerful platform for wavefront and dynamic beam steering of electromagnetic and acoustic waves by introducing the phase-gradient degree of freedom, but they still suffer from narrow steering angles and low efficiency due to inherent dispersion. Here, we theoretically propose and experimentally demonstrate a dispersionless gradient metasurface approach that offers a practical yet powerful route to wide-angle, near-perfect beam steering, overcoming the longstanding trade-off between bandwidth and efficiency in metasurface design. As a proof of concept, we design and fabricate an acoustic metasurface operating at 3430 Hz, which exhibits near-perfect anomalous refraction with an efficiency exceeding 85% over an unprecedented bandwidth of 44.4% (2800-4400 Hz). This performance enables continuous frequency-driven beam steering from 46.5° to 15.8°, covering a 30.7° field of view. Serving as a critical transition between anomalous and normal dispersion, the concept of dispersionless gradient metasurfaces provides a criterion for evaluating the bandwidth limitations of various dispersive counterparts, and establishes a new paradigm for high-performance, frequency-driven dynamic wavefront manipulation.
Chromatic dispersion fundamentally limits metasurface performance by coupling beam steering to frequency, thereby constraining bandwidth and undermining practical deployment. Here, we break this limitation by introducing a fundamentally different design paradigm for metasurfaces that decouples wavefront control from fr...
Xin-Bo Chen, Ming-Yong Zhuang, Si-Ning Li et al.· Journal of Physics D: Applie...· 0 citations
Complete and efficient manipulation of electromagnetic (EM) waves is a cornerstone for creating advanced functional devices. However, conventional single-layer passive metasurfaces often face an intrinsic trade-off between phase-modulation range and reflection efficiency. To overcome this limitation, we propose and dem...
The classical Soret-type acoustic Fresnel zone plate suffers from two major drawbacks: severe chromatic aberration and low energy efficiency. This work proposes a Subwavelength High-gain Achromatic Resonant Plate with a thickness of only 0.43λ0: straight/coiled-up units achieve π phase complementarity and near-total tr...
Yu-Jiao Lei, Jun Yi, Meng-Xue Zhang et al.· Applied Physics Letters· 0 citations
Dispersion is a key limiting factor in ultrafast systems as it modifies the temporal structure of ultrashort optical pulses. Conventional dispersion compensation techniques, though widely used, rely on a combination of several bulky optical components and complex, long propagation paths, posing challenges for integrati...
Anna Fitriana, Katsuya Tanaka, Roland Schiek et al.· 0 citations
In this Letter, a low-divergence, low-sidelobe circularly polarized (CP) vortex emitter is proposed to generate a high-gain orbital angular momentum (OAM) beam of mode +l. Its leaky-wave radiation arises from the interaction between a bound surface wave and the spatially varying patches. A direct aperture field synthes...
Orbital angular momentum (OAM) vortex waves have become a promising technology for future 6G high-capacity wireless communications. However, the inherent propagation divergence and performance degradation under angular deviation severely restrict their practical applications. This paper proposes a transmissive focusing...
Ying-Qi Zhong, Lu-Yao Wang, Yi-Fei Wang et al.· ACS Omega· 0 citations
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