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Table Of Integrals Series And Products

비만아 부모의 돌봄 경험: q 방법론

IEEE Transactions on Pattern Analysis and Machine Intelligence

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Introduction To Electrodynamics

Electromagnetic Metamaterials: Transmission Line Theory and Microwave Applications. By Christophe Caloz and Tatsuo Itoh.

In this study, by using an equivalent circuit method, a polarization-insensitive terahertz (THz) absorber based on multilayer graphene-based metasurfaces (MGBMs) is systematically designed, providing an extremely broad absorption bandwidth (BW). The proposed absorber is a compact, three-layer structure, comprising square-, cross-, and circular-shaped graphene metasurfaces embedded between three separator dielectrics. The equivalent-conductivity method serves as a parameter retrieval technique to characterize the graphene metasurfaces as the components of the proposed circuit model. Good agreement is observed between the full-wave simulations and the equivalent-circuit predictions. The optimum MGBM absorber exhibits >90% absorbance in an extremely broad frequency band of 0.55–3.12 THz (BW=140%). The results indicate a significant BW enhancement compared with both the previous metal- and graphene-based THz absorbers, highlighting the capability of the designed MGBM absorber. To clarify the physical mechanism of absorption, the surface current and the electric-field distributions, as well as the power loss density of each graphene metasurface, are monitored and discussed. The MGBM functionality is evaluated under a wide range of incident wave angles to prove that the proposed absorber is omnidirectional and polarization-insensitive. These superior performances guarantee the applicability of the MGBM structure as an ultra-broadband absorber for various THz applications.

Multilayer graphene-based metasurfaces: robust design method for extremely broadband, wide-angle, and polarization-insensitive terahertz absorbers.

Inspired by the information theory, a new concept of re-programmable
 encrypted graphene-based coding metasurfaces was investigated at terahertz
 frequencies. A channel-coding function was proposed to convolutionally record an
 arbitrary information message onto unrecognizable but recoverable parity beams
 generated by a phase-encrypted coding metasurface. A single graphene-based
 reflective cell with dual-mode biasing voltages was designed to act as “0” and “1”
 meta-atoms, providing broadband opposite reflection phases. By exploiting graphene
 tunability, the proposed scheme enabled an unprecedented degree of freedom in the
 real-time mapping of information messages onto multiple parity beams which could not
 be damaged, altered, and reverse-engineered. Various encryption types such as
 mirroring, anomalous reflection, multi-beam generation, and scattering diffusion can
 be dynamically attained via our multifunctional metasurface. Besides, contrary to
 conventional time-consuming and optimization-based methods, this paper convincingly
 offers a fast, straightforward, and efficient design of diffusion metasurfaces of
 arbitrarily large size. Rigorous full-wave simulations corroborated the results
 where the phase-encrypted metasurfaces exhibited a polarization-insensitive
 reflectivity less than −10 dB over a broadband frequency range from 1 THz to
 1.7 THz. This work reveals new opportunities for the extension of re-programmable
 THz-coding metasurfaces and may be of interest for reflection-type security systems,
 computational imaging, and camouflage technology.

/pdf/an-information-theory-inspired-strategy-for-design-of-re-39r7n9ckwd.pdf

An Information Theory-Inspired Strategy for Design of Re-programmable Encrypted Graphene-based Coding Metasurfaces at Terahertz Frequencies.

Multi-bit graphene-based bias-encoded metasurfaces for real-time terahertz wavefront shaping: From controllable orbital angular momentum generation toward arbitrary beam tailoring

Real-Time and Broadband Terahertz Wave Scattering Manipulation via Polarization-Insensitive Conformal Graphene-Based Coding Metasurfaces

This paper theoretically proposes a multichannel functional metasurface computer characterized by Generalized Sheet Transition Conditions (GSTCs) and surface susceptibility tensors. The study explores a polarization- and angle-multiplexed metasurfaces enabling multiple and independent parallel analog spatial computations when illuminated by differently polarized incident beams from different directions. The proposed synthesis overcomes substantial restrictions imposed by previous designs such as large architectures arising from the need of additional subblocks, slow responses, and most importantly, supporting only the even reflection symmetry operations for normal incidences, working for a certain incident angle or polarization, and executing only single mathematical operation. The versatility of the design is demonstrated in a way that an ultra-compact, integrable and planar metasurface-assisted platform can execute a variety of optical signal processing operations such as spatial differentiation and integration. It is demonstrated that a metasurface featuring non-reciprocal property can be thought of as a new paradigm to break the even symmetry of reflection and perform both even- and odd-symmetry mathematical operations at normal incidences. Numerical simulations also illustrate different aspects of multichannel edge detection scheme through projecting multiple images on the metasurface from different directions. Such appealing findings not only circumvent the major potential drawbacks of previous designs but also may offer an efficient, easy-to-fabricate, and flexible approach in wave-based signal processing, edge detection, image contrast enhancement, hidden object detection, and equation solving without any Fourier lens.

Ali Abdolali

Papers

Multilayer graphene-based metasurfaces: robust design method for extremely broadband, wide-angle, and polarization-insensitive terahertz absorbers.

An Information Theory-Inspired Strategy for Design of Re-programmable Encrypted Graphene-based Coding Metasurfaces at Terahertz Frequencies.

Multi-bit graphene-based bias-encoded metasurfaces for real-time terahertz wavefront shaping: From controllable orbital angular momentum generation toward arbitrary beam tailoring

Real-Time and Broadband Terahertz Wave Scattering Manipulation via Polarization-Insensitive Conformal Graphene-Based Coding Metasurfaces

Generalized Optical Signal Processing Based on Multi-Operator Metasurfaces Synthesized by Susceptibility Tensors