Parallel Analog Computing Based on a 
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 Multiple-Input Multiple-Output Metasurface Processor With Asymmetric Response

Babaee, Amirhossein; Momeni, Ali; Abdolali, Ali; Fleury, Romain

doi:10.1103/physrevapplied.15.044015

Cited by 23 publications

(15 citation statements)

References 51 publications

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“…It is seen that after the superposition of arbitrary phases, we will end up with a complex number, including both amplitude and phase. The required amplitude and phase distributions over the metasurface for multi concentration points are calculated as [45] N n=1 a n .e −jΦn(i,j) = A f (i, j)e −jΦf (i,j) , (7) where Φ n is the phase profile, a n is the weight factor (amplitude coefficient) of n-th focal point, and N indicates the number of focus spots. Also, A f is the final amplitude profile, and Φ f is the final phase profile of the multi-focal meta-lens.…”

Section: A Formulations Of Amplitude and Phase Profiles Across Multi-focal Meta-lensmentioning

confidence: 99%

“…Before demonstrating the methodology, it is emphasized that continuous profiles of amplitude and phase will be obtained using the analytical formulation mentioned in Equation (7). Depending on the available bits, we face a limited number of states for unit cell amplitude and phase.…”

Section: B Theoretical Calculations Of Near-field Distributionmentioning

confidence: 99%

“…According to the conventional method, we have two foci by applying two different phase profiles, but it is not simultaneous multi-focusing. So, we combine these two phase layouts by employing the superposition theory as mentioned in Equation (7). As first example, consider two uncorrelated foci being at x 1 = 300µm, y 1 = 300µm, z 1 = 500µm, and x 2 = −300µm, y 2 = −300µm, z 2 = 500µm positions.…”

Section: A Bi-focal Concentrationmentioning

confidence: 99%

“…Both the focal points have been placed in the same plane, which means they have a similar position in the z-direction. Regarding Equation (7), after a combination of two obtained phasors, we must end up with a complex profile, including amplitude and phase. A multi-focusing digital device is implemented if we discretize both amplitude and phase and utilize the corresponding unit cell state for each one.…”

Section: A Bi-focal Concentrationmentioning

confidence: 99%

“…Adjusting the spatial distribution of specified scatterers, a metasurface enables the manipulation of phase, amplitude, and polarization of electromagnetic waves in reflection and transmission modes. They have been designed to control electromagnetic waves in various frequency spectrum bands for specific purposes such as refractive index sensing [3], super diffraction [4], subwavelength imaging [5], beam shaping [6], and signal processing [7].…”

mentioning

confidence: 99%

See 4 more Smart Citations

Multi-Channel Near-Field Terahertz Communications Using Reprogrammable Graphene-Based Digital Metasurface

Rouhi

Hosseininejad

Abadal

et al. 2021

J. Lightwave Technol.

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Digital metasurfaces have opened unprecedented ways to accomplish novel electromagnetic devices thanks to their simple manipulation of electromagnetic waves. However, the metasurfaces leveraging phase-only or amplitude-only modulation restricted the full-functionality control of the devices. Herein, a digital graphene-based metasurfaces engineering wavefront amplitude and phase are proposed for the first time to tackle this challenge in the terahertz (THz) band. The concept and its significance are verified using reprogrammable multi-focal metalens based on a 2/2-bit digital unit cell with independent control of 2-bit states of amplitude and phase individually. Moreover, we introduce a novel method to directly transmit digital information over multiple channels via the reprogrammable digital metasurface. Since these metasurfaces are composed of digital building blocks, the digital information can be directly modulated to the metasurface by selecting specific digital sequences and sent them to predetermined receivers distributed in the focal points. Following that, a multi-channel THz high-speed communication system and its application to build three-dimensional wireless agile interconnection are demonstrated. The presented method provides a new architecture for wireless communications without using complicated components of conventional systems. This work motivates versatile meta-devices in many applications envisioned for the THz frequencies, which will play a vital role in modern communications.

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Section: A Formulations Of Amplitude and Phase Profiles Across Multi-focal Meta-lensmentioning

confidence: 99%

Section: B Theoretical Calculations Of Near-field Distributionmentioning

confidence: 99%

Section: A Bi-focal Concentrationmentioning

confidence: 99%

Section: A Bi-focal Concentrationmentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Multi-Channel Near-Field Terahertz Communications Using Reprogrammable Graphene-Based Digital Metasurface

Rouhi

Hosseininejad

Abadal

et al. 2021

J. Lightwave Technol.

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Multifunctional Reflective Metasurface to Independently and Simultaneously Control Amplitude and Phase with Frequency Tunability

Phon

Lee

Lor

et al. 2023

Advanced Optical Materials

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The capability to dynamically modulate electromagnetic wavefronts can revolutionize and be crucial for future wireless technology. Electromagnetic waves can be fundamentally described in terms of amplitude, phase, polarization, and angular frequency. However, reported reconfigurable metasurfaces can only control one or two fundamental parameters and require different tuning/switching elements or materials that remain challenging to control those continuously. In this work, an approach is presented for designing electrically tunable reflective metasurfaces that enable independent and simultaneous control of amplitude and phase, while also providing frequency tuning capability. This is achieved by arranging two varactor diodes on the top layer and a lumped resistor on the bottom layer. The proposed metasurface is fabricated and several electromagnetic functionalities experimentally demonstrated as proof‐of‐concept applications, including reflector, radar absorbing, dual and single‐beam steering, and amplitude control. The proposed metasurface will open avenues for realizing advanced multifunctional devices to fully control electromagnetic parameters, offering numerous applications in future communication technologies, radar systems, and information processing.

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Topological Phase Singularities in Light Reflection from Non‐Hermitian Uniaxial Media

Maslova,

Lebedev,

Baranov

2024

Advanced Optical Materials

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Perfect light transmission into a dielectric at the Brewster angle is one of the simplest effects of macroscopic electromagnetism. The common wisdom states that absorption in the dielectric violates Brewster angle and leads to a non‐vanishing reflection. Yet, incorporating anisotropy may recover perfect transmission of p‐polarized light into the absorbing medium. Unlike the ordinary “lossless” Brewster angle, perfect transmission in this case is accompanied by phase singularities of the reflection amplitude. In this paper, phase singularities and the associated topological charges are theoretically examined as emerging in the wavelength‐incidence angle space upon perfect transmission into absorbing uniaxial dielectrics. The analytical criterion of perfect light transmission into an anisotropic medium is derived, phase singularities are demontrated in these scenarios, and their dynamics are studied as a function of material parameters. Finally, by lowering the symmetry of the problem, this phenomenon is translated into a different parameter space of wave vector components, and illustrate the feasibility of this phenomenon with available optically anisotropic materials. The results may become valuable for the development of novel analog computing schemes and holography approaches.

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Parallel Analog Computing Based on a 2×2 Multiple-Input Multiple-Output Metasurface Processor With Asymmetric Response

Cited by 23 publications

References 51 publications

Multi-Channel Near-Field Terahertz Communications Using Reprogrammable Graphene-Based Digital Metasurface

Multi-Channel Near-Field Terahertz Communications Using Reprogrammable Graphene-Based Digital Metasurface

Multifunctional Reflective Metasurface to Independently and Simultaneously Control Amplitude and Phase with Frequency Tunability

Topological Phase Singularities in Light Reflection from Non‐Hermitian Uniaxial Media

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