A Reflective Polarization Converting Metasurface at &lt;inline-formula&gt; 
                     &lt;tex-math notation="LaTeX"&gt;${X}$ &lt;/tex-math&gt;
                  &lt;/inline-formula&gt;-Band Frequencies

Lončar, Josip; Grbic, Anthony; Hrabar, Silvio

doi:10.1109/tap.2018.2816784

Cited by 79 publications

(28 citation statements)

References 24 publications

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“…In the design, the bottom layer, detailed in FIG. 2, is aperture-coupled to a resonant tank formed by the patch array and ground plane 15,[24][25][26] . The bottom layer contains microstrip lines terminated by vias close to the edge of unit cell.…”

Section: Metasurface Designmentioning

confidence: 99%

“…Common configurations of dual-polarized orthogonal aperture-coupled patches can be found in literature 28,29 . In the proposed design, however, the orthogonal excitation of the structure is achieved by the shared elements of adjacent unit cells, as explained above (for additional information, refer to Section II of 15 ). The sharing occurs at each layer of the metasurface.…”

Section: Metasurface Designmentioning

confidence: 99%

“…In polarization control, metasurfaces have shown superior performance in terms of size and efficiency over conventional methods [4][5][6][7] . Multilayer design led to further improvements in terms of power efficiency and polarization conversion ratio (P CR) 3,[8][9][10][11][12][13][14][15] . Some reported polarization converting metasurfaces achieve P CRs exceeding 95% 8,9,14,15 .…”

Section: Introductionmentioning

confidence: 99%

“…Multilayer design led to further improvements in terms of power efficiency and polarization conversion ratio (P CR) 3,[8][9][10][11][12][13][14][15] . Some reported polarization converting metasurfaces achieve P CRs exceeding 95% 8,9,14,15 .…”

Section: Introductionmentioning

confidence: 99%

“…We propose an ultrathin, active metasurface that selectively controls the polarization of an incident wave upon reflection, with simulated P CR reaching 100%. The active metasurface leverages the design of recently reported passive polarization converter 15 , making it possible to overcome the above mentioned challenges, and design a highly compact, low-profile metasurface with broader bandwidth and improved performance for oblique incidence. Much like the passive metasurface, this active one consists of three patterned metallic layers, which allows efficient coupling to impinging electromagnetic radiation.…”

Section: Introductionmentioning

confidence: 99%

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Ultrathin active polarization-selective metasurface at X-band frequencies

2019

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An ultrathin active polarization-selective metasurface is designed and optimized for operation in the X-band. The metasurface leverages the design of a previously reported passive polarization converting metasurface. Similar to the passive polarization converter, the proposed active metasurface consists of three patterned metallic sheets. Its bottom sheet is modified and populated with ultra-wideband, unconditionally stable amplifiers and corresponding biasing networks. The metasurface provides over 35 dB of input-output isolation achieved through orthogonal polarizations, which ensures stable operation. It was fabricated with a low-cost, printed-circuit-board and pick-and-place process. The performance of the metasurface was measured and its stability confirmed. The desired effects of amplification, polarization conversion, polarization selectivity and non-reciprocal behavior were successfully demonstrated in both full-wave simulations and measurements. Due to its extremely small thickness (0.66 mm or 0.02λ at 10 GHz), the metasurface shows excellent performance for a wide range of incident angles, which exceeds ±30 • . It achieves a perfect (100%) polarization conversion ratio in simulation, and 98.4% in measurement.

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Section: Metasurface Designmentioning

confidence: 99%

Section: Metasurface Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Ultrathin active polarization-selective metasurface at X-band frequencies

2019

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How Thin and Efficient Can a Metasurface Reflector Be? Universal Bounds on Reflection for Any Direction and Polarization

Abdelrahman

Monticone

2022

Advanced Optical Materials

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such as negative refraction, invisibility, artificial magnetism, and light manipulation over thin surfaces. [2][3][4][5][6][7][8] Because of the capacity to create nanostructures in virtually unlimited forms and with high precision, the design space of all conceivable geometrical configurations for a given volume is vast, possibly spanning thousands to millions of optimization variables. Design methods that involve large-scale simulations, either via brute-force parametric sweeps or using more advanced inverse-design and optimization algorithms, are the typical approach to arrive at components with superior performance. There is no doubt that this approach is successful in achieving efficient designs; [9][10][11][12][13] however, it suffers from a fundamental weakness: no matter how many simulations are performed, there is typically no guarantee that a globally maximal/minimal solution could be identified. If a structure's performance metrics are already close to the optimal solution, significant computing work could be wasted for the sake of finding a better design with no noticeable enhancement.In this context, the question of how to determine a fundamental bound on a certain physical response in a specific volume (such as absorption, scattering, reflection, etc.), no matter how finely structured the system is, has become critically important both from a scientific and a practical perspective. To obtain universal bounds on optical response, these questions should be approached from a fundamental perspective, by examining basic physics constraints like energy conservation, causality, passivity, and symmetries, which govern the totality of electromagnetic interactions. Several fundamental bounds have already been identified in the literature, such as bounds on the scattering cross section, absorption, near-field radiative heat transfer, antenna performance, the local density of states, the refractive index, and other physical responses. [14][15][16][17][18][19][20] In a design approach informed by fundamental bounds, inversedesign methods can then be used to determine an actual feasible design as close as possible to the global optimum.A particularly significant optical function that has only received marginal attention in this context is the ability to optimally control the reflected field in terms of magnitude, phase, direction, and polarization, which is important for a plethora of Light reflection plays a crucial role in a number of modern technologies. In this paper, analytical expressions for maximal reflected power in any direction and for any polarization are given for generic planar structures made of a single material represented by a complex scalar susceptibility. The problem of optimal light-matter interactions to maximize reflection is formulated as the solution of an optimization problem in terms of the induced currents, subject to energy conservation and passivity, which admits a global upper bound by using Lagrangian duality. The derived upper bounds apply to a broad range of planar structures, in...

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Ultrathin and high efficient wideband polarization converting metasurface

Abdullah¹,

Kamal

Ullah³

et al. 2021

Int J RF Microw Comput Aided Eng

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A wideband polarization converting metasurface (MS) is designed, simulated and measured. The proposed design achieves cross polarization conversion from 10.5 to 16.2 GHz. The MS exhibit the property of polarization insensitivity against variation in the incidence angle (0 -60 ) of electromagnetic waves.The unit cell of the MS is imprinted on dielectric substrate supported by a metal ground plane. The MS transform linearly polarized electromagnetic waves to their orthogonal polarization state, that is, x/y-polarized waves and vice versa in the 10.5 to 16.2 GHz band. To validate the simulated results, the surface is fabricated and tested. A great similarity is found in the simulated and experimental.

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A Reflective Polarization Converting Metasurface at <inline-formula> <tex-math notation="LaTeX">${X}$ </tex-math> </inline-formula>-Band Frequencies

Cited by 79 publications

References 24 publications

Ultrathin active polarization-selective metasurface at X-band frequencies

Ultrathin active polarization-selective metasurface at X-band frequencies

How Thin and Efficient Can a Metasurface Reflector Be? Universal Bounds on Reflection for Any Direction and Polarization

Ultrathin and high efficient wideband polarization converting metasurface

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