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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

We propose a scheme for realizing the coherent perfect absorption (CPA) by exploiting the moderate coupling between the electric and magnetic resonators in an electromagnetically induced transparency-like (EIT-like) system. Moreover, the ideal parity-time (PT) symmetry can be established in such a passive system by precisely engineering the rate between the scattering and dissipative losses of resonators as well as their coupling. Specifically, by controlling the phase difference between two incident waves, the absorption ratio of CPA at the peak frequency can be dynamically modulated from 1 to 0. Such a scheme provides an effective route to construct absorbing devices.

http://iopscience.iop.org/article/10.1088/2040-8978/18/9/095104/pdf

Coherent perfect absorption in an electromagnetically induced transparency-like (EIT-like) system

This paper proposes a novel theoretical equivalent circuit model to characterize the split ring resonator (SRR), based on the analysis of the individual SRR geometry configuration and the distribution relationship of the electric field in it. Then it becomes very desirable to analytically calculate the corresponding inductances and capacitance of the equivalent circuit, which determine the resonance frequencies of the SRR. Numerical simulations are used to verify the proposed equivalent circuit model. It has been proven that the results obtained by the equivalent circuit model are in good agreement with the numerical simulation tools. Furthermore, the SRR has more than one resonance frequencies according to the equivalent circuit model, which indicates that there may be more than one frequency region with the negative effective permeability.

SRRs' Artificial Magnetic Metamaterials Modeling Using Transmission Line Theory

Application of rough set theory for NVNA phase reference uncertainty analysis in hybrid information system

CMOS interface circuitry for closed-loop capacitive MEMS accelerometer is presented in this paper. The switched-capacitor (SC) charge integration method is used for the capacitive sensing, correlated double sampling (CDS) technique is introduced to compensate the finite gain of operation amplifiers, reduce 1/f noise and offsets. In order to enhance stability of system and the frequency response performance, proportional-integral- differential (PID) adjuster are applied. An elaborate layout design with 0.5um CMOS process was completed and nonidealities are analyzed and optimized. The post-simulation results indicate that the sensitivity of the system is 1.22V/g, the full measurement range is −3g to +3g, the minimum acceleration detected can be achieved 30ug, nonlinearity is less than 0.16%.

CMOs interface circuitry for a closed-loop capacitive MEMS accelerometer

Some willful or unaware electromagnetic lesk and interference will influence farawary device though long distance propagation. In order to solve this EMC problem, near-field to far-field transformation method is studied by means of PWE method. With Lorentz reciprocity principle, near-field to far-field transformation, integrable couplings and compensation method are deduced. Second, sampling error during near-field measurement is analyzed. Three kinds of error are considered, which include random amplitude-phase error, finite scanning truncation error and probe positioning error. For each kind of error sources, it will be introduced into the simulation model respectively and modified by the error compensation method. Finally, electromagnetic radiation of real aircraft model is simulated and analyzed, which receives aircraft's electromagnetic radiation property on 500kHz–30MHz, 50MHz–400MHz and 1GHz.

Qun Wu

Papers

Coherent perfect absorption in an electromagnetically induced transparency-like (EIT-like) system

SRRs' Artificial Magnetic Metamaterials Modeling Using Transmission Line Theory

Application of rough set theory for NVNA phase reference uncertainty analysis in hybrid information system

CMOs interface circuitry for a closed-loop capacitive MEMS accelerometer

Study on near-field to far-field transformation of equipment's electromagnetic radiant field