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Principles Of Optics Electromagnetic Theory Of Propagation Interference And Diffraction Of Light

Tables of integrals

Metamaterials are composed of periodic subwavelength metal/dielectric structures that resonantly couple to the electric and/or magnetic components of the incident electromagnetic fields, exhibiting properties that are not found in nature. This class of micro- and nano-structured artificial media have attracted great interest during the past 15 years and yielded ground-breaking electromagnetic and photonic phenomena. However, the high losses and strong dispersion associated with the resonant responses and the use of metallic structures, as well as the difficulty in fabricating the micro- and nanoscale 3D structures, have hindered practical applications of metamaterials. Planar metamaterials with subwavelength thickness, or metasurfaces, consisting of single-layer or few-layer stacks of planar structures, can be readily fabricated using lithography and nanoprinting methods, and the ultrathin thickness in the wave propagation direction can greatly suppress the undesirable losses. Metasurfaces enable a spatially varying optical response (e.g. scattering amplitude, phase, and polarization), mold optical wavefronts into shapes that can be designed at will, and facilitate the integration of functional materials to accomplish active control and greatly enhanced nonlinear response. This paper reviews recent progress in the physics of metasurfaces operating at wavelengths ranging from microwave to visible. We provide an overview of key metasurface concepts such as anomalous reflection and refraction, and introduce metasurfaces based on the Pancharatnam-Berry phase and Huygens' metasurfaces, as well as their use in wavefront shaping and beam forming applications, followed by a discussion of polarization conversion in few-layer metasurfaces and their related properties. An overview of dielectric metasurfaces reveals their ability to realize unique functionalities coupled with Mie resonances and their low ohmic losses. We also describe metasurfaces for wave guidance and radiation control, as well as active and nonlinear metasurfaces. Finally, we conclude by providing our opinions of opportunities and challenges in this rapidly developing research field.

A review of metasurfaces: physics and applications.

The advent of negative index materials has spawned extensive research into metamaterials over the past decade. Metamaterials are attractive not only for their exotic electromagnetic properties, but also their promise for applications. A particular branch–the metamaterial perfect absorber (MPA)–has garnered interest due to the fact that it can achieve unity absorptivity of electromagnetic waves. Since its first experimental demonstration in 2008, the MPA has progressed significantly with designs shown across the electromagnetic spectrum, from microwave to optical. In this Progress Report we give an overview of the field and discuss a selection of examples and related applications. The ability of the MPA to exhibit extreme performance flexibility will be discussed and the theory underlying their operation and limitations will be established. Insight is given into what we can expect from this rapidly expanding field and future challenges will be addressed.

https://www.onlinelibrary.wiley.com/doi/pdf/10.1002/adma.201200674

Metamaterial Electromagnetic Wave Absorbers

Metamaterials are composed of periodic subwavelength metal/dielectric structures that resonantly couple to the electric and/or magnetic components of the incident electromagnetic fields, exhibiting properties that are not found in nature. Planar metamaterials with subwavelength thickness, or metasurfaces, consisting of single-layer or few-layer stacks of planar structures, can be readily fabricated using lithography and nanoprinting methods, and the ultrathin thickness in the wave propagation direction can greatly suppress the undesirable losses. Metasurfaces enable a spatially varying optical response, mold optical wavefronts into shapes that can be designed at will, and facilitate the integration of functional materials to accomplish active control and greatly enhanced nonlinear response. This paper reviews recent progress in the physics of metasurfaces operating at wavelengths ranging from microwave to visible. We provide an overview of key metasurface concepts such as anomalous reflection and refraction, and introduce metasurfaces based on the Pancharatnam-Berry phase and Huygens' metasurfaces, as well as their use in wavefront shaping and beam forming applications, followed by a discussion of polarization conversion in few-layer metasurfaces and their related properties. An overview of dielectric metasurfaces reveals their ability to realize unique functionalities coupled with Mie resonances and their low ohmic losses. We also describe metasurfaces for wave guidance and radiation control, as well as active and nonlinear metasurfaces. Finally, we conclude by providing our opinions of opportunities and challenges in this rapidly developing research field.

A review of metasurfaces: physics and applications

A compact left-handed metamaterial (LHM) with miniaturized unit cell and broad bandwidth is proposed. By optimization of design, the relative bandwidth is up by 21.1%, and the unit cell electrical length is only 0.072 at the central frequency where the LHM is available. The negative refraction characteristics of the wedge-shaped LHM are investigated using full-wave simulation, and it is shown that the designed LHM exhibits negative refraction in a broad band range of 8.5–10.5 GHz, and hence the existence of the LHM is proven. Copyright © 2008 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

Design and negative refraction investigation of a compact left‐handed metamaterial

In this article, based on the integrated passive device (IPD) technology with GaAs substrate, an elliptical bandpass filter (BPF) is proposed with a reasonable and compact layout. Within the operating frequency of 4.27-4.9 GHz, the proposed design has an insertion loss of less than 1 dB. This miniaturized filter, with the size of about 1.32mm2, is fabricated using IPD technology. Probes on the wafer and the vector network analyzer are used to obtain its accurate S-parameters. The measurement result of this BPF is in good agreement with its simulation. That demonstrates the high frequency selectivity of the designed filter and shows its capability of using in modern communication technology.

A Compact Bandpass Filter Design Based on GaAs IPD Technology

Wireless communication has become a standard solution to satisfy ever-increasing demands for information transfer in our daliy life. Further more, reconfigurable metasurfaces comprised of multiple tunable unit cells have drawn significant attentions due to their superior electromagnetic performance, with the desired electromagnetic response can be controlled by computer.So we present a prototype of wireless communication system based reconfigurable metasurface that works in the microwave frequency range. A 2-D periodical array of reconfigurable metasurface is loaded with varactor diode to effectively adjust the in-band transmission and reflection coefficients the maintain different far-field electromagnetic characteristics. Since the reconfigurable metasurface does not radiate electromagnetic waves and it only carries information by adjusts its reflection and transmission coefficients. With this reconfigurable metasurface, a passive communication method can be realized.

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Theoretical Investigation of the Passive Transmitter Based on Reconfigurable Metasurface

In this paper, the far field properties of the lossless metamaterial covered perfectly conductor and air cylinder are discussed. The model configuration is given. Under different geometrical and electromagnetic parameters, the far field properties of the model are investigated through the directivities and normalized radiation resistances. Important regularity is obtained.

Investigation on the far Field Properties of the Lossless Metamaterial Covered Cylinder

In this paper, a novel reconfigurable holographic metamaterial antenna (RHMA) based on electrically controlled liquid crystal (LC) is proposed. A novel unit cell is designed, and the resulting antenna presents a large beam scanning range rising from −62.7° to +59.7°. Moreover, method to obtain stable phase center (PC) is presented. The simulation results demonstrate that the variation in PC is significantly suppressed based on the proposed method. The proposed antenna is a good candidate for the satellite communication.

Qun Wu

Papers

Design and negative refraction investigation of a compact left‐handed metamaterial

A Compact Bandpass Filter Design Based on GaAs IPD Technology

Theoretical Investigation of the Passive Transmitter Based on Reconfigurable Metasurface

Investigation on the far Field Properties of the Lossless Metamaterial Covered Cylinder

Liquid-Crystal-Based Reconfigurable Holographic Metamaterial Antenna with Stable Phase Center