Parallel Optical Spatial Signal Processing Based on 2 × 2 MIMO Computational Metasurface

Babaee, Amirhossein; Momeni, Ali; Moeini, Mohammad Moein; Fleury, Romain; Abdolali, Ali

doi:10.1109/metamaterials49557.2020.9285089

Cited by 6 publications

(5 citation statements)

References 8 publications

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“…This brings a fabulous flexibility which can be used in different practical applications, such as the next generation of wireless communication. [ 6 ] In this regard, designing MSs for applications with multiple incident waves has been studied [ 40–42 ] with different design approaches. Tang et al.…”

Section: Introductionmentioning

confidence: 99%

“…Meanwhile, this approach suffers from the interferences between different working planes, and also, the limitation of the size of MS for complex cases with more than two incident waves. In addition, there is a similar approach [ 41,42 ] employing dual‐polarized unit cells to deal with multiple feeds. However, it has some limitations in the cases containing more than two incident waves.…”

Section: Introductionmentioning

confidence: 99%

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On the Design of Multibeam Digital Metasurfaces With Multiple Feeds

Rezvan

Yazdi

Hosseininejad

2022

Advcd Theory and Sims

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In this paper, an analytical design procedure for multibeam metasurfaces with multiple feeds is presented. Considering arbitrary number of input and output beams, the required amplitude and phase distributions on the metasurface plane are theoretically derived without any optimization process. How the limitation of using only passive metasurfaces poses different challenges in the practical implementation of the amplitude profile is discussed. Then, to resolve these problems, a filtering procedure is proposed which effectively produces the desired output pattern. Moreover, the design method is verified through introducing a reflective metasurface with three input beams and sixteen output beams in arbitrary directions. It utilizes a graphene‐based unit cell providing simultaneous 2/2‐bit phase/amplitude modulation, that is, totally 16 states. For validation purposes, the analytical results are compared with numerical full‐wave simulation ones in which a good agreement between them is observed. In addition, by using the proposed design method, three different practical cases for wave manipulation functionalities, including power control, beam steering, and radar cross section (RCS) reduction capabilities are demonstrated. The presented approach paves the way for efficient design of the metasurfaces for a multitude of applications, including reconfigurable intelligent surfaces and multifunctional surfaces.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

On the Design of Multibeam Digital Metasurfaces With Multiple Feeds

Rezvan

Yazdi

Hosseininejad

2022

Advcd Theory and Sims

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“…The applicability of the GF method to execute signal processing has been verified in a series of proposals via spin hall effect of light [ 24 ], disordered and complex scattering system [ 7 , 25 , 26 ], layered structures [ 18 , 27 ], topological insulators [ 28 , 29 ], plasmonic arrays [ 5 ], bianisotropic metasurfaces [ 10 , 17 ], and so on. Nevertheless, prior GF-based studies still face two different challenges: (i) parallel realization of mathematical operators has been only addressed by using bulky structures [ 7 , 16 ] and array of subwavelength meta-atoms with complex geometries [ 30 , 31 ] and thus, they are still subject to implementation difficulties arising from high fabrication precision demands; (ii) although reflective optical processing for normal incidences is a good alternative for complex oblique illumination setups, it still needs additional optical components to separate the processed signal from the input one [ 10 ]. Further efforts to tackle these barriers must be accompanied with the use of more powerful architectures to implement spatial optical signal processing.…”

Section: Introductionmentioning

confidence: 99%

Parallel wave-based analog computing using metagratings

et al. 2022

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Wave-based signal processing has witnessed a significant expansion of interest in a variety of science and engineering disciplines, as it provides new opportunities for achieving high-speed and low-power operations. Although flat optics desires integrable components to perform multiple missions, yet, the current wave-based computational metasurfaces can engineer only the spatial content of the input signal where the processed signal obeys the traditional version of Snell’s law. In this paper, we propose a multi-functional metagrating to modulate both spatial and angular properties of the input signal whereby both symmetric and asymmetric optical transfer functions are realized using high-order space harmonics. The performance of the designed compound metallic grating is validated through several investigations where closed-form expressions are suggested to extract the phase and amplitude information of the diffractive modes. Several illustrative examples are demonstrated to show that the proposed metagrating allows for simultaneous parallel analog computing tasks such as first- and second-order spatial differentiation through a single multichannel structured surface. It is anticipated that the designed platform brings a new twist to the field of optical signal processing and opens up large perspectives for simple integrated image processing systems.

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“…Almost any application of electromagnetic energy, in which an electromagnetic wave interacts with some sort of material, requires the precise knowledge of complex permittivity and permeability. [ 1,2 ] Electromagnetic characterization is used in a diverse field of scientific and industrial applications such as agriculture, [ 3 ] bioengineering, [ 4 ] communication, [ 5 ] imaging, [ 6 ] optical processing, [ 7–9 ] and military systems. [ 10 ]…”

Section: Introductionmentioning

confidence: 99%

Time‐Modulated Metasurface‐Assisted Measurements

Ghasemi

Rajabalipanah

Tayarani

et al. 2021

Advanced Optical Materials

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This paper explores time‐modulated metasurface‐assisted waveguide setups for the unique and accurate permittivity and permeability extraction of lossy dispersive samples with phase‐less measurements. It is theoretically demonstrated that when the position of the short‐circuit termination is dynamically modulated in a predefined way, the phase information of the reflection S‐parameter manifests itself into the amplitude level of the emerging harmonics. Being insensitive to the calibration plane shifts and phase uncertainties in reflection measurements while bypassing a priori knowledge about the material under test (MUT) and also the transmission information, can be regarded as the main advantages of the proposed time‐modulated material characterization approach. Using a simple post‐processing step, several illustrative examples are presented to numerically verify the validity of the proposed approach for some applicable and practical types of homogeneous materials. Two possible realization schemes based on mechanical actuation and electrical phase control are comprehensively discussed. An uncertainty analysis to examine how realization tolerances can affect the accuracy of results is also performed. The effectiveness of the proposed method is further experimentally demonstrated using a programmable phase‐agile metasurface. By involving the temporal dimension, the proposed strategy takes a great step forward in the phase‐less reconstruction of electromagnetic parameters.

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Parallel Optical Spatial Signal Processing Based on 2 × 2 MIMO Computational Metasurface

Cited by 6 publications

References 8 publications

On the Design of Multibeam Digital Metasurfaces With Multiple Feeds

On the Design of Multibeam Digital Metasurfaces With Multiple Feeds

Parallel wave-based analog computing using metagratings

Time‐Modulated Metasurface‐Assisted Measurements

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