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Unified dispersion model for the electric susceptibilities of physically realizable materials

Physical Review A 2019年第5期99卷 053822-053822页

作者： Richard A. Shepherd, Sr. Rolls-Royce North American Technologies Incorporated Rolls-Royce 450 South Meridian Street Indianapolis Indiana 46225 USA

Based on the powerful method of network control theory, a complete, classically derived, broadband, analytic dispersion model is presented which describes electric susceptibility for a rigorously physically realizable, dielectric material system with a possible dc conductivity contributor. The analysis results in a susceptibility model constructed entirely from pole-residue groups. As a result, solitary Debye-type poles are not physically supported in the broadband analytic dispersion theory presented in this paper. While previous investigators have focused primarily on modeling susceptibility using only negative complex-conjugate poles, the type found naturally at optical frequencies and above, this analysis was conducted under no such restriction; hence, it is considered unified and should apply to all classical-type susceptibility behavior at all frequencies from dc to daylight, including some of the ultraviolet region where the material-continuum assumption begins to break down. Excluding conductivity due to the absence of any proof of magnetic monopole existence, the model should be equally applicable for modeling magnetic susceptibility dispersion. Based upon a rigorous emphasis on physical realizability, the complete, classical dispersion model is demonstrated by successfully modeling the complex permittivity of liquid water at 25 °C using measurement data from 30 MHz to 1200 THz.

关键词： Classical optics Magnetic susceptibility Mathematical physics Permittivity Dielectrics Classical electromagnetism Drude model finite-difference time-domain method

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Influence of nonmagnetic dielectric spacers on the spin-wave response of one-dimensional planar magnonic crystals

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Physical Review B 2019年第22期100卷 224428-224428页

作者： G. Centała M. L. Sokolovskyy C. S. Davies M. Mruczkiewicz S. Mamica J. Rychły J. W. Kłos V. V. Kruglyak M. Krawczyk Faculty of Physics Adam Mickiewicz University in Poznan Uniwersytetu Poznanskiego 2 61-614 Poznań Poland Eilat 43a Holon 5843045 Israel FELIX Laboratory Radboud University 7 Toernooiveld 6525 ED Nijmegen The Netherlands Institute for Molecules and Materials Radboud University 135 Heyendaalseweg 6525 AJ Nijmegen The Netherlands Institute of Electrical Engineering Slovak Academy of Sciences Dubravska cesta 9 841 04 Bratislava Slovakia Institute of Molecular Physics Polish Academy of Sciences Mariana Smoluchowskiego 17 60-179 Poznań Poland School of Physics and Astronomy University of Exeter Stocker Road Exeter EX4 4QL United Kingdom

One-dimensional planar magnonic crystals are usually fabricated as a sequence of stripes intentionally or accidentally separated by nonmagnetic spacers. The influence of spacers on shaping the spin-wave spectra is complex and still not completely clarified. We perform detailed numerical studies of the one-dimensional single- and bicomponent magnonic crystals comprised of a periodic array of thin ferromagnetic stripes separated by nonmagnetic spacers. We show that the dynamic dipolar interactions between the stripes, mediated even by ultranarrow nonmagnetic spacers, lead to a significant increase in the frequency of the ferromagnetic resonance mode, while simultaneously reducing the spin-wave group velocity. We attribute these spectral deformations to the modifications of dipolar pinning and shape anisotropy, both of which are dependent on the width of the spacers and the thickness of the stripes, as well as changes with the dynamical magnetic volume charges formed due to inhomogeneous spin-wave amplitude.

关键词： Dipolar interaction Exchange interaction Magnetization dynamics Spin waves Magnetic systems Magnonic crystals Nanostructures Nanowires Bloch-Floquet theorem finite-difference time-domain method finite-element method Landau-Lifschitz-Gilbert equation Plane-wave expansion

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Trapezoidal recursive convolution-based FDTD method for arbitrary-shaped dispersive materials

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ELECTRONICS LETTERS 2018年第25期54卷 1429-1430页

作者： Shibayama, J. Suzuki, K. Yamauchi, J. Nakano, H. Hosei Univ Fac Sci & Engn 3-7-2 Kajino Cho Koganei Tokyo 1848584 Japan

A trapezoidal recursive convolution (TRC) technique is one of the simple ways to incorporate dispersive models into the finite-difference time-domain (FDTD) method. The authors newly develop the TRC-FDTD method for the analysis of arbitrary-shaped dispersive materials using a dispersive contour-path algorithm. The accuracy of the present method is found to be the same as that using the Z-transform technique with reduced computational requirements.

关键词： finite difference time-domain analysis convolution recursive estimation surface plasmons transforms arbitrary-shaped dispersive materials dispersive contour-path algorithm trapezoidal recursive convolution technique dispersive models finite-difference time-domain method TRC-FDTD method Z-transform technique reduced computational requirements

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Effect of absorption treatment with band-shaped absorber inside closed narrow rooms

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ACOUSTICAL SCIENCE AND TECHNOLOGY 2018年第6期39卷 440-443页

作者： Asakura, Takumi Yashima, Wataru Satoh, Fumiaki Tokyo Univ Sci 2641 Yamazaki Noda Chiba 2780022 Japan Chiba Inst Technol 2-17-1 Tsudanma Narashino Chiba 2750016 Japan

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Tuning full photonic band gap with plasma frequency in two-dimensional photonic crystals composed of anisotropic dielectric rods in plasma background

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JOURNAL OF OPTICS-INDIA 2018年第4期47卷 489-495页

作者： Ramezani, A. H. Khalkhali, T. Fathollahi Moghadam, M. R. Islamic Azad Univ West Tehran Branch Dept Phys Tehran Iran NSTRI Photon & Quantum Technol Res Sch Tehran Iran

In this study, we analyze full photonic band gap formation and properties of two-dimensional photonic crystals with square lattice, composed of anisotropic tellurium rods with different geometric shapes in a plasma background. Using the finite-difference time-domain method, we discuss the tunability of the full photonic band gap width as a function of the plasma frequency for different values of tellurium rod's parameters. The calculated results show that our proposed structures represent full photonic band gaps with considerable width, which are dependent on plasma frequency.

关键词： Photonic band gap material Plasma photonic crystals Anisotropic tellurium material finite-difference time-domain method

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Proposition and Numerical Analysis of a Plasmonic Sensing Structure of Metallo-Dielectric Grating and Silver Nano-slabs in a Metal-Insulator-Metal Configuration

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PLASMONICS 2018年第6期13卷 2205-2213页

作者： Sakib, Mashnoon Alam Yousuf, S. M. Enamul Hoque Das Gupta, Sourov Islam, Md Zahurul Bangladesh Univ Engn & Technol Dept Elect & Elect Engn Dhaka 1000 Bangladesh

We propose and numerically investigate a near-infrared surface plasmon resonance-based refractive index sensor having in unison an extremely high sensitivity (1719 nm/RIU) and transmission efficiency (91.73%) with a high figure of merit (39.81). The proposed sensor structure, consisting of a 1D metallo-dielectric grating of silver and rectangular-shaped silver nano-slabs in a metal-insulator-metal configuration, excites both propagating surface plasmon polaritons and localized surface plasmon polaritons producing highly improved spectral response. Using the finite-difference time-domain computation method, the spectral characteristics were analyzed and some important sensing performances, such as sensitivity, transmission efficiency, full-width at half-maximum, and figure of merit, were optimized through numerical simulations as a function of the shape and size of the nanostructures. As a specific application, the proposed structure was also investigated for temperature sensing application and its temperature sensitivity is found to be much better than the state-of-the-art. The proposed sensor structure may have monumental applications in such areas as biomedical and environmental sensing applications and photonic integrated circuits.

关键词： Surface plasmon resonance Integrated plasmonics Localized surface plasmon polaritons Propagating surface plasmon polaritons Photonic temperature sensor finite-difference time-domain method

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Emergence of point defect states in a plasmonic crystal

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Physical Review B 2019年第24期100卷 245402-245402页

作者： Hikaru Saito Hugo Lourenço-Martins Noémie Bonnet Xiaoyan Li Tracy C. Lovejoy Niklas Dellby Odile Stéphan Mathieu Kociak Luiz Henrique Galvão Tizei Department of Advanced Materials Science and Engineering Kyushu University 6-1 Kasugakoen Kasuga Fukuoka 816-8580 Japan Laboratoire de Physique des Solides Université Paris-Sud CNRS-UMR 8502 Orsay 91405 France Nion Company 1102 Eighth Street Kirkland Washington 98033 USA

Plasmonic crystals are well known to have band structure including a band gap, enabling the control of surface plasmon propagation and confinement. The band dispersion relation of bulk crystals has been generally measured by momentum-resolved spectroscopy using far field optical techniques while the defects introduced in the crystals have separately been investigated by near field imaging techniques so far. Particularly, defect related energy levels introduced in the plasmonic band gap have not been observed experimentally. In order to investigate such a localized mode, we performed electron energy-loss spectroscopy (EELS) on a point defect introduced in a plasmonic crystal made up of flat cylinders protruding out of a metal film and arranged on a triangular lattice. The energy level of the defect mode was observed to lie within the full band-gap energy range. This was confirmed by a momentum-resolved EELS measurement of the band gap performed on the same plasmonic crystal. Furthermore, we experimentally and theoretically investigated the emergence of the defect states by starting with a corral of flat cylinders protrusions and adding sequentially additional shells of those in order to eventually form a plasmonic band-gap crystal encompassing a single point defect. It is demonstrated that a defectlike state already forms with a crystal made up of only two shells.

关键词： Plasmonics Point defects Electron energy loss spectroscopy finite-difference time-domain method

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Numerical analysis of effective refractive index sensor based on slot micro-ring and Bragg grating

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INTERNATIONAL JOURNAL OF MODERN PHYSICS B 2019年第25期33卷

作者： Zhao, C. Y. Chen, P. Y. Zhang, L. Hangzhou Dianzi Univ Coll Sci Hangzhou Zhejiang Peoples R China Shanxi Univ Inst Optoelect State Key Lab Quantum Opt & Quantum Opt Devices Taiyuan Shanxi Peoples R China

A novel design of a silicon-on-insulator (SOD-based resonator based on slot micro-ring and Bragg gratings is presented. The corrugated Bragg gratings are structured on both sides of slot micro-ring waveguides. The variation of the effective refractive index is detected by monitoring the shift of the spectral of the resonator. The transmission spectrum and field distribution of the sensor structures are simulated using finite-difference time-domain (FDTD) method. With the combination of the Bragg gratings, the measurement range of the sensor significantly increases without the restriction of a free spectral range (FSR). Our proposed sensor design provides a promising candidate for on-chip integration with other silicon photonic element.

关键词： finite-difference time-domain method slot waveguides Bragg gratings sensor

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Lightning Surge Analysis of a PWR Nuclear Power Plant Using the Three-Dimensional FDTD method 34

Lightning Surge Analysis of a PWR Nuclear Power Plant Using ...

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34th International Conference on Lightning Protection (ICLP)

作者： Tatematsu, A. Motoyama, H. Tanigawa, A. Cent Res Inst Elect Power Ind Elect Power Engn Res Lab Yokosuka Kanagawa Japan Japan Atom Power Co Int Project Dev Dept Tokyo Japan

ISBN: (纸本)9781538666357

Lightning protection is an important factor in the design of nuclear power plants, for example, to protect power equipment and sensitive electronic devices and guarantee human safety. To design effective protection measures, it is useful to predict lightning surge phenomena and evaluate the effectiveness of the protection measures. Recently, the finite-difference time-domain (FDTD) method, which solves Maxwell's equations directly and does not require the assumption of a transverse electromagnetic mode, has been an effective tool for analyzing electromagnetic transient phenomena in three-dimensional or grounding structures. In this study, we model buildings and groundings of a nuclear power plant using an FDTD-based surge simulation code, study the ground potential rises of a nuclear power plant, step voltages around the reactor building, and the transient responses of grounding buses drawn into the auxiliary building and the metal sheaths of coaxial cables in the case of a direct lightning strike to the lightning protection system (LPS) of the reactor or turbine building, and study the effect of the configuration of the LPS.

关键词： electromagnetic transient analysis finite-difference time-domain method grounding lightning lightning protection system

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Study on Frequency Drift Phenomenon of time Varied Plasma in 1D Metal Resonant Cavity

Study on Frequency Drift Phenomenon of Time Varied Plasma in...

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Cross Strait Quad-Regional Radio Science and Wireless Technology Conference (CSQRWC)

作者： Zhou, Bixue Li, Xiaoyue Yang, Lixia Shi, Lijuan Jiangsu Univ Dept Commun Engn Zhenjiang Peoples R China Jiangsu Univ Dept Phys Zhenjiang Peoples R China

ISBN: (纸本)9781538664230

In this letter, a frequency drift phenomenon is simulated, when the electromagnetic wave is created in 1D metal cavity, by the modified JEC-FDTD method. By using the method, its resonant frequency of metal cavity is obtained under the conditions of the time varied plasma. The results show that the faster the plasma is generated, the more obviously the frequency drift phenomenon.

关键词： finite-difference time-domain method time varied plasma frequency drift

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