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Metamaterials, 2008 International Workshop on

Date 9-12 Nov. 2008

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  • 2008 International workshop on metamaterials

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  • [Front cover]

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  • Schedule for meta 2008

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  • [Title page]

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  • [Copyright notice]

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  • Table of contents

    Page(s): iii
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  • Meta 2008 Committee members

    Page(s): iv - v
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  • Meta 2008 sponsors

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  • Conference site

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  • Registration

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  • [Guidelines for presentations]

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  • Meta 2008 oral sessions

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  • Meta 2008 poster sessions

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  • 2008 international workshop on metamaterials oral sessions

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  • Wideband and low loss metamaterials for microwave and RF applications: Fast algorithm and antenna design

    Page(s): 7
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (100 KB) |  | HTML iconHTML  

    The paper is split into two major parts: (1) the first is to look into the EM wave properties in metamaterials and to develop an efficient solvers for their designs; and (2) the second is to try to design the metamaterials for antenna applications. For the efficient algorithms developed, the integral equation solvers accelerated using the adaptive integral (equation) method (AIM) and also the pre-corrected fast Fourier transform (pFFT) technique were developed and various examples in the designs will be demonstrated. In the second case, a single antenna designed using the metamaterial properties is considered, designed, fabricated, and measured. It is shown that the new design of the metamaterial antenna has a low loss (or high gain) and a broad bandwidth and this was never achieved using the conventional technique. The development of the metamaterial antennas was further extended to an array antenna and some interesting and promising results will be provided. View full abstract»

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  • FDTD Modeling of electromagnetic cloaks

    Page(s): 12 - 13
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    In this paper, a radial-dependent dispersive FDTD method is developed to model metamaterials based on coordinate transformation. Such artificial materials have been applied in developing electromagnetic cloaking devices, plane wave concentrators and wave polarization rotators. By using the time-domain numerical technique, the transient response and operational bandwidth of the proposed metamaterials is evaluated. It is demonstrated, for example, that the perfect "invisibility" from electromagnetic cloaks is only available for lossless metamaterials and within an extremely narrow frequency band. View full abstract»

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  • Tunable plasmonic metamaterials based on fractal geometry

    Page(s): 15
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    Surface plasmon polaritons (SPPs) are elementary electromagnetic (EM) excitations bounded at a metal/dielectric interface. Due to two important features - local field enhancement and subwavelength resolution capability - of the SPP, it has attracted considerable attention recently and many SPP-based applications were proposed or demonstrated. However, for a natural material, its plasmon frequency (pomega) is fixed by electron density. This restriction limits the aforementioned SPP-based applications to a wider frequency regime. In this talk, we show that a metallic plate with subwavelength fractal-shaped slits supports SPpsilas with omegaptuned efficiently by the geometry of the fractal structure. We derive effective-medium models to describe such tunable plasmonic metamaterials, and found that the latter can mimic plasmonic metals in frequency regimes beyond the (fixed) plasmon frequencies of natural metals (gold, silver, etc.). We show that our plasmonic metamaterials possess many applications. As one example, we show that one can use it to focus light sources with subwavelength imaging abilities and enhanced field strengths. Finite-difference-time-domain (FDTD) simulations are performed to design realistic structures and verify all predicted phenomena. View full abstract»

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  • Time-domain modeling techniques for periodic structures

    Page(s): 16 - 19
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (618 KB) |  | HTML iconHTML  

    A novel time-domain modeling techniques for periodic structures are described in this paper. The three methods discussed here are the spectral FDTD method, array scanning FDTD method, and equivalent electrical parameter extraction for periodic structures. View full abstract»

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  • Effective 1-D material properties of coplanar-waveguide-based EBG- and meta-materials

    Page(s): 20 - 23
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1170 KB) |  | HTML iconHTML  

    This paper aims to give unified characterization of coplanar-waveguide-based 1D electromagnetic-bandgap (EBG) and metamaterial in terms of two fundamental per-unit-length (PUL) transmission parameters, i.e., characteristic impedance and propagation constant. In analysis, a full-wave self-calibrated method of moments (MoM) is applied to de-embedding these two PUL parameters from simulation of two-port finite-extent CPW sections. Firstly, 1-D CPW-based EBG material with periodical loading of series-inductive units is studied to provide a physical insight into slow-wave and bandstop behaviors of guided-wave. Then, CPW metamaterials with simultaneous series-capacitive and shunt-inductive loading are investigated to demonstrate the guided-wave performances in the distinctive left- (LH) and right-handed (RH) passbands. It is demonstrated that the stopband or bandgap between the LH and RH passbands can be wholly eliminated by properly selecting distributed CPW elements. A few CPW circuits based on these 1-D EBG and metamaterials are in final fabricated to confirm the theoretical predictions. View full abstract»

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  • Issues of applications of metamaterials to miniaturization of antennas

    Page(s): 24
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    The author discusses the demands for the miniaturization of antennas in RF and microwave bands. The promising applications of metamaterials in the miniaturization of antennas are briefly mentioned. View full abstract»

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  • Compensated anisotropic metamaterials: Manipulating sub-wavelength images

    Page(s): 25 - 28
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (256 KB) |  | HTML iconHTML  

    In this presentation, I will analyze the image focusing, rotation, lateral shift, as well as the image magnification with sub-wavelength resolutions through differently designed structures of compensated anisotropic metamaterials. The verifications of all the proposed structures by full wave electromagnetic simulations will also be demonstrated. Utilizing the proposed structures, planar optical image of sub-wavelength objects can be magnified to wavelength scale allowing for further optical processing of the image by conventional optics. View full abstract»

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  • New transport regime and Zitterbewegung effect in two-dimensional photonic crystal

    Page(s): 29 - 32
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1726 KB) |  | HTML iconHTML  

    A new transport regime of electromagnetic wave in two-dimensional photonic crystal near the Dirac point has been demonstrated by exact numerical simulation. In this regime, the conductance of photon is inversely proportional to the thickness of sample, which can be described by Dirac equation very well. Based on it, some unusual beating effects, which can be regarded as optical analogue to Zitterbewegung of relativistic electron, can also be observed near the Dirac point in a two-dimensional photonic crystal. The superiority of such a phenomenon for photons is that it can be found in different scaling structures with wide frequency regions. It can be observed by measuring the time dependence of the transmission coefficient through photonic crystal slabs. Thus, it is particularly suited for experimentally observing this effect. We have observed such a phenomenon by exact numerical simulations, confirming a long-standing theoretical prediction. View full abstract»

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  • Investigations of metamaterials for microwave frequency in time-domain

    Page(s): 33
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    Summary form only given. Metamaterials, specially, metamaterials for microwave by composite right-left-handed transmission line (CRLH-TL), are studied frequency in frequency-domain. For example, it was studied by transmission-reflection characteristics from S-parameter. But it is difficult to know clearly the relationship of phases, of group velocity, of phase velocity, and the wave propagation process. In this paper, the investigations of metamaterials for microwave in time-domain are presented: 1. The experimental set-up and the experimental method are presented for the microstrip transmission line protocol. For a simple CRLH-TL, it shows directly that the phase velocity is toward the source and is consequently antiparallel to the group velocity. 2. For the electric beam controlled CRLH-TL leaky wave antenna, it shows clear that there are two left-handed frequency ranges, but only one range can be used for electric beam controlled radiation. 3. For the asymmetric RH-CRLH coupler, which composed of a conventional right-handed (RH) transmission line and a CRLH transmission, the time-domain experimental results show that the phase velocities of the two lines to be equal and move toward the same direction. A vortex-like interface mode exists at the interface of a RH-CRLH coupler and the vortex-like interface mode can lead to slow propagation from the CRLH TL across the interface to the RH TL. 4. For the ENG/MNG pairs, the experiments in time-domain can show clear the distribution of evanescent wave in ENG/MNG pairs by transmission line, and the phase relationship between the input and output of the pair while the tunneling occurs. 5. For the photonic crystal transmission line, the experimental results can show the dispersive relation directly, and show there is no any left-handed transmission relationship. 6. For the coupler composed of CRLH-TL and PC-TL, the time-domain experiments show that it is similar to the coupler composed CRLH-TL and normal transmission line. View full abstract»

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  • Negative refraction in photonic crystals

    Page(s): 34 - 35
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    In this paper, negative refraction in 2D and 3D photonic crystals is reported. The major point is to design and realize photonic crystal structures with high-performance negative refraction and imaging properties from theoretical and experimental sides. View full abstract»

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  • Slow light and omnidirectional resonances in the metamaterial-based multi-layer structures

    Page(s): 36
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (108 KB) |  | HTML iconHTML  

    Metamaterials, with effective negative permittivity and/or negative permeability, have paid much attention in recent years. We present the results on slow light and omnidirectional resonances in the metamaterial-based structures. We have found that the group velocity vanishes in the planar and cylindrical waveguides consisting of the left-handed metamaterial core and the single-negative-permittivity cladding. Ultra-low group velocity dispersion has been also found in such waveguides. On the other hand, we have found out omnidirectional resonances in various kinds of 1D photonic crystal heterostructures possessing the zero-phieff/zero-nmacr gap, and in a simple sandwich structure. The mechanisms of both phenomena have been revealed, and the properties of them have also been studied. View full abstract»

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