Tailor the functionalities of metasurfaces based on a complete phase diagram

Dai, Ming; Lei, Chi‐Un; Jiaming,; Shiyi,; Qiu,; Xin,; Shulin,; Shaojie,; Ning,; Sun, Dong; Che,; Ma, Kaixue; Hao, Dan; Ziqi,; Miao,; Qü,; Li, Qing; He, Xin; Zhou, Quan; Meng,; Xiao, Xiao; Qiong, Qiong

doi:10.1109/iwem.2016.7504888

Cited by 11 publications

(9 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As a final comment, it ought to be mentioned that the meta-reflectarrays can be well-described by the coupled-mode theory (CMT) [82,83,84], which provides a general guidance for designing reflective metasurfaces with tailored functionalities. More specifically, the properties of meta-atoms are fully controlled by the two simple parameters (i.e., the intrinsic and radiation losses), which are, in turn, dictated by the geometrical or material properties of the underlying structures [84].…”

Section: Metasurfaces Near a Metal Screenmentioning

confidence: 99%

Gradient metasurfaces: a review of fundamentals and applications

2017

View full text Add to dashboard Cite

In the wake of intense research on metamaterials the two-dimensional analogue, known as metasurfaces, has attracted progressively increasing attention in recent years due to the ease of fabrication and smaller insertion losses, while enabling an unprecedented control over spatial distributions of transmitted and reflected optical fields. Metasurfaces represent optically thin planar arrays of resonant subwavelength elements that can be arranged in a strictly or quasi periodic fashion, or even in an aperiodic manner, depending on targeted optical wavefronts to be molded with their help. This paper reviews a broad subclass of metasurfaces, viz. gradient metasurfaces, which are devised to exhibit spatially varying optical responses resulting in spatially varying amplitudes, phases and polarizations of scattered fields. Starting with introducing the concept of gradient metasurfaces, we present classification of different metasurfaces from the viewpoint of their responses, differentiating electricaldipole, geometric, reflective and Huygens' metasurfaces. The fundamental building blocks essential for the realization of metasurfaces are then discussed in order to elucidate the underlying physics of various physical realizations of both plasmonic and purely dielectric metasurfaces. We then overview the main applications of gradient metasurfaces, including waveplates, flat lenses, spiral phase plates, broadband absorbers, color printing, holograms, polarimeters and surface wave couplers. The review is terminated with a short section on recently developed nonlinear metasurfaces, followed by the outlook presenting our view on possible future developments and perspectives for future applications.

show abstract

Section: Metasurfaces Near a Metal Screenmentioning

confidence: 99%

Gradient metasurfaces: a review of fundamentals and applications

2017

View full text Add to dashboard Cite

show abstract

“…As discussed in Ref. [34], σ can obviously affect the absorption rate whereas have minor effects on the resonance, while the resonant structures can affect the operating frequencies, which is demonstrated effectively in Fig. 3.…”

Section: Mixed Mechanisms and Meta-atom Designmentioning

confidence: 74%

High-Performance and Ultra-Broadband Metamaterial Absorber Based on Mixed Absorption Mechanisms

et al. 2019

View full text Add to dashboard Cite

Perfect absorbers are highly desirable in many military applications, such as radar cross section (RCS) reduction, cloaking devices, and also sensor detectors; however, most approaches (such as wedge and pyramidal absorbers, multi-resonant absorbers) intrinsically suffer from very large size at low-frequency domain, limited bandwidth, as well as low absorption ratio issues. In this paper, we solve these issues via combining the Huygens metasurface and three-layers slab impedance metasurface, with the former satisfying the novel impedance matching theory and the latter exhibiting multi-resonant property and optimized conductivities, which achieve high-efficiency absorption at lower frequency range (1-3 GHz) and higher frequency region (3-18 GHz), respectively. To demonstrate our concept, we design/fabricate a realistic metasurface absorber working in the microwave region, and perform experiments to demonstrate that it can achieve an ultra-broadband (1-18 GHz) performance with absorption rate better than 75%. The numerical simulations are in good agreements with experiments, indicating that the absorption efficiency can be further pushed to 92% within the whole working band by optimizing our designs. More importantly, our device is insensitive for different polarizations and oblique incidences. Our findings can stimulate the realizations of ultra-broadband meta-devices, particularly can enhance the cloaking technology relying on high-efficiency absorption. INDEX TERMS Ultra-broadband absorption, mixed absorption mechanisms, high absorption rate, polarization insensitive.

show abstract

“…The hallmark advantage of the reflectionless Brewster absorbers is that they are based on inherently nonresonant metamaterials, and thus the bandwidth of impedance-matched absorption can cover the ultra-broad spectrum from dc to optical frequencies, which is far beyond those of other absorber techniques 5,6,[21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36] . As a demonstration, in Fig.…”

Section: Discussionmentioning

confidence: 99%

Ultra-broadband reflectionless Brewster absorber protected by reciprocity

et al. 2021

View full text Add to dashboard Cite

The Brewster’s law predicts zero reflection of p-polarization on a dielectric surface at a particular angle. However, when loss is introduced into the permittivity of the dielectric, the Brewster condition breaks down and reflection unavoidably appears. In this work, we found an exception to this long-standing dilemma by creating a class of nonmagnetic anisotropic metamaterials, where anomalous Brewster effects with independently tunable absorption and refraction emerge. This loss-independent Brewster effect is bestowed by the extra degrees of freedoms introduced by anisotropy and strictly protected by the reciprocity principle. The bandwidth can cover an extremely wide spectrum from dc to optical frequencies. Two examples of reflectionless Brewster absorbers with different Brewster angles are both demonstrated to achieve large absorbance in a wide spectrum via microwave experiments. Our work extends the scope of Brewster effect to the horizon of nonmagnetic absorptive materials, which promises an unprecedented wide bandwidth for reflectionless absorption with high efficiency.

show abstract

Tailor the functionalities of metasurfaces based on a complete phase diagram

Cited by 11 publications

References 1 publication

Gradient metasurfaces: a review of fundamentals and applications

Gradient metasurfaces: a review of fundamentals and applications

High-Performance and Ultra-Broadband Metamaterial Absorber Based on Mixed Absorption Mechanisms

Ultra-broadband reflectionless Brewster absorber protected by reciprocity

Contact Info

Product

Resources

About