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Metamaterial absorbers realized in an X-band rectangular waveguide

Chinese Physics B 2012年第11期21卷 474-478页

作者：黄勇军文光俊李建钟靖平王平孙元华 O.Gordon 朱卫仁 Key Laboratory of Broadband Optical Fiber Transmission&Communication Networks School of Communication and Information EngineeringUniversity of Electronic Science and Technology of China Advanced Computing and Simulation Laboratory(AχL) Department of Electrical and Computer Systems EngineeringMonash University

In this paper, we demonstrate six types of metamaterial absorbers （MMAs） by measuring their absorptivities in an X-band （8 12 GHz） rectangular waveguide. Some of the MMAs have been demonstrated previously by using the free space measurement method, and the others are proposed firstly in this paper. The measured results show that all of the six MMAs exhibit high absorptivities above 98%, which have similar absorbing characteristics to those measured in the free space. The numerically obtained surface current densities for each MMA show that the absorbing mechanism is the same as that under the free space conditions. Such a demonstration method is superior to the conventional free space measurement method due to the small-scale test samples required, the simple measure device, and its low cost. Most importantly, the proposed method opens a way to enable MMAs to be used in microwave applications such as matched terminations.

关键词： metamaterial absorber electric resonator rectangular waveguide

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From laptops to supercomputers: a single highly scalable code base for spiking neuronal network simulations

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BMC Neuroscience 2013年第1期14卷 1-2页

作者： Susanne Kunkel Abigail Morrison Markus Diesmann Maximilian Schmidt Jochen M Eppler Moritz Helias Hans E Plesser Jun Igarashi Tomoki Fukai Gen Masumoto Shin Ishii Simulation Laboratory Neuroscience - Bernstein Facility Simulation and Database Technology Institute for Advanced Simulation Jülich Aachen Research Alliance Jülich Research Centre Germany Institute of Neuroscience and Medicine (INM-6) and Institute for Advanced Simulation (IAS-6) Jülich Research Centre and JARA Germany Bernstein Center Freiburg Albert-Ludwig University of Freiburg Germany Institute of Cognitive Neuroscience Faculty of Psychology Ruhr-University Bochum Germany Medical Faculty RWTH University Aachen Germany Laboratory for Neural Circuit Theory RIKEN Brain Science Institute Wako Japan Department of Mathematical Sciences and Technology Norwegian University of Life Sciences Aas Norway High-Performance Computing Team RIKEN Computational Science Research Program Kobe Japan Integrated Systems Biology Laboratory Department of Systems Science Graduate School of Informatics Kyoto University Japan

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Partially coherent light interaction with nano objects

Partially coherent light interaction with nano objects

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International Conference on Transparent Optical Networks

作者： Malin Premaratne Advanced Computing and Simulation Laboratory (AxL) Department of Electrical and Computer Systems Engineering (ECSE) Monash University Clayton VIC Australia

Scattering of fully coherent light from nano objects is a very matured field with plethora of applications. However, due to various fundamental and operational reasons, fluctuations in various characteristic features of interacting light fields cannot be fully suppressed. Such light fields with random fluctuating features are known as partially coherent light. When partially coherent light interact with nano-objects (i.e. solids or voids), new characteristics emerge (e.g. coherence vortex, fully-incoherent point-pairs) that are absent in fully coherent scattered fields. In this paper, we review the fundamental metrics for characterising partially coherent light and how such metrics can be used to reveal some of the hidden features of partially coherent light interacting with nano-objects.

关键词： Coherence Optical scattering Optical vortices Optical sensors Optical beams Optical polarization Biomedical optical imaging

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Tunable metamaterials based on ferrites and the applications

Tunable metamaterials based on ferrites and the applications

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International Workshop on Metamaterials

作者： Yongjun Huang Guangjun Wen Weiren Zhu School of Communication and Information Engineering University of Electronic Science and Technology of China Chengdu China Advanced Computing and Simulation Laboratory (AxL) Department of Electrical and Computer Systems Engineering Monash University Clayton VIC Australia

The research of metamaterial is one of most important global activity that promises to change the lives in many different ways. Flexibly controlling the properties of metamaterials by tunable designs makes metamaterials more colorful and thus enables a family of new electromagnetic devices. In this paper, the use of ferrites on design of tunable metamaterials has been reviewed. Owing to the novel properties of ferrites, including broadband negative permeability and tunability of permeability, a great many researchers have focused on investigating ferrites based metamaterials and the relevant applications. This paper reviews the design, theoretical analysis, numerical and experimental demonstrations, and the potential applications of the ferrite based metamaterials.

关键词： Metamaterials Ferrites Wires Permeability Magnetic resonance Helium

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Tunable ferrite based triple-band μ-negative metamaterial

Tunable ferrite based triple-band μ-negative metamaterial

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Asia Communications and Photonics Conference and Exhibition (ACP)

作者： Haibin Sun Guangjun Wen Yongjun Huang Jingping Zhong Weiren Zhu Key Laboratory of Broadband Optical Fiber Transmission & Communication Networks School of Communication and Information Engineering University of Electronic Science and Technology Chengdu China Advanced Computing and Simulation Laboratory (AxL) Department of Electrical and Computer Systems Engineering Monash University Clayton VIC Australia

We present a tunable triple-band μ-negative metamaterial composed of loop resonator and ferrite. The tunable triple-band-stop transmission spectrum of such metamaterial is investigated numerically by full wave simulations. Moreover, the corresponding effective parameters are retrieved to illustrate the tunable μ-negative characteristic.

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Determination of the effective constitutive parameters of active transmission line metamaterials

Determination of the effective constitutive parameters of ac...

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International Workshop on Metamaterials

作者： Li-Ming Si Weiren Zhu Xin Lv Beijing Key Laboratory of Millimeter Wave and Terahertz Technology Department of Electronic Engineering School of Information and Electronics Beijing Institute of Technology Beijing China Advanced Computing and Simulation Laboratory (AxL) Department of Electrical and Computer Systems Engineering Monash University Clayton VIC Australia

This paper presents an alternative approach, based on the transmission line theory, for determination of the attenuation constant (α), phase constant (β), characteristic impedance (Zo), refractive index (n), effective permittivity (ε) and effective permeability (μ) for active transmission line (TL) metamaterial. When active elements are introduced into the lossy TL meta-material, the gain acquired from the active elements should be evaluated quantitatively against the attenuation due to the loss in order to avoid ambiguities in determining the signs of the effective constitutive parameters. In stead of directly determining the characteristic impedance from S-parameters, we introduce the reflection coefficient as an intermediate quantity to assist solving the characteristic impedance. This paper shows demonstration of this method with an example of active TL metamaterial.

关键词： Metamaterials Impedance Refractive index Attenuation Magnetic materials Permeability

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A fresh look at the validity of the diffusion approximation for modeling fluorescence spectroscopy in biological tissue

A fresh look at the validity of the diffusion approximation ...

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Annual International Conference of the IEEE Engineering in Medicine and Biology Society

作者： Chintha Chamalie Handapangoda Malin Premaratne Saeid Nahavandi with the Centre for Intelligent Systems Research Deakin University Geelong Victoria 3217 Australia with the Advanced Computing and Simulation Laboratory (A_XL) Department of Electrical and Computer Systems Engineering Monash University Clayton Victoria 3800 Australia malin.

ISBN: (纸本)9781424441198

Fluorescence has become a widely used technique for applications in noninvasive diagnostic tissue spectroscopy. The standard model used for characterizing fluorescence photon transport in biological tissue is based on the diffusion approximation. On the premise that the total energy of excitation and fluorescent photon flows must be conserved, we derive the widely used diffusion equations in fluorescence spectroscopy and show that there must be an additional term to account for the transport of fluorescent photons. The significance of this additional term in modeling fluorescence spectroscopy in biological tissue is assessed.

关键词： approximation fluorescence applications

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Research on fractional order controller based on best rational approximation approach

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Journal of Convergence Information Technology 2012年第4期7卷 50-58页

作者： Zhao, Huimin Nie, Bing Li, Wen Deng, Wu Software Institute Dalian Jiaotong University Dalian 116028 China Key Laboratory of Numerical Simulation in the Sichuan Provincial College Neijiang Normal University Neijiang 641112 China Artificial Intelligence Key Laboratory of Sichuan Province Sichuan University of Science and Engineering Zigong 643000 China State Key Laboratory of Power Transmission Equipment and System Security and New Technology College of Electrical Engineering Chongqing University Chongqing 400044 China Key Laboratory of advanced Design and Intelligent Computing Dalian University Ministry of Education Dalian 116622 China

Introduce the basic concept of best rational approximation and constructing procedure of the best rational approximation function in Laplace domain. By an illustrative example the design method of FOC based on best rational approximation is discussed. The performance comparison of transfer functions between the FOC obtained by best rational approximation method and conventional PID shows that it is effective to apply the method in design of FOC, which can guarantee maximum absolute error of amplitude frequency characteristic of approximation function in a given error tolerance.

关键词： Rational functions

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Complex-ω approach versus complex-k approach in description of gain-assisted surface plasmon-polariton propagation along linear chains of metallic nanospheres

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Physical Review B 2011年第11期83卷 115451-115451页

作者： Indika B. Udagedara Ivan D. Rukhlenko Malin Premaratne Advanced Computing and Simulation Laboratory (AχL) Department of Electrical and Computer Systems Engineering Monash University Clayton VIC 3800 Australia

Propagation characteristics of surface plasmon-polaritons (SPPs) in linear chains of metallic nanospheres (LCMNs) can be found from a dispersion equation, by assuming that either frequency or wave number of a SPP is real. In this paper, we present a comparative study of SPP modes corresponding to the two types of complex solutions for an infinitely long LCMN embedded in a gain medium. We show that even though gain predominantly affects the SPP dispersion obtained with real frequency, both solutions result in the same dispersion and attenuation of SPP modes, when Ohmic losses are almost compensated by gain. In this regime, an analytic expression for the propagation length of SPPs exists, and the SPPs’ dispersion is determined by a real equation. We also demonstrate that for a given amount of gain (below the amplification limit of ~1000 cm−1), transversely polarized SPPs attenuate slower than longitudinally polarized SPPs and are, therefore, preferable for the purpose of energy transfer in gain-supplied LCMNs. The transmission windows for SPP modes of different polarizations do not overlap each other, which facilitates realization of LCMN-based plasmonic filters. Our results may prove useful in design optimization of all-optical chips for power-efficient optical supercomputers.

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Propagation of surface plasmon-polaritons in linear chains of metallic nanoparticles embedded in a gain medium

Propagation of surface plasmon-polaritons in linear chains o...

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International Conference on Quantum Electronics (IQEC)

作者： Indika B. Udagedara Ivan D. Rukhlenko Malin Premaratne Advanced Computing and Simulation Laboratory (A-çL) Department of Electrical and Computer Systems Engineering Monash University VIC Australia

We analyze the two different types of complex solutions to the dispersion equation of surface plasmon-polaritons residing in a linear chain of metallic nanoparticles in the presence of gain in the host medium.

ISBN: (纸本)9780977565771

关键词： Dispersion Nanoparticles Equations Mathematical model Plasmons Optical polarization Optical surface waves

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