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Analysis of coplanar LiNbO₃ waveguide structures applicable to electrooptic modulator with FDTD method

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 2003年第3期39卷 234-237页

作者： Lee, B Byun, J Kim, BK Kwangwoon Univ RFIC Res & Educ Ctr Seoul 139701 South Korea Samsung Elect Co Ltd R&D Team Antenna Part Suwon 442742 Gyeonggi Do South Korea

The 3D finite-difference time-domain (FDTD) method and the 2D quasi-static formulation have been used to calculate the characteristic impedance and the microwave effective index of coplanar waveguide structures on lithium niobate (LiNbO3) single-crystal substrates with a yttria-stabilized zirconia (YSZ) or SiO2 buffer layer. The results shown can be a good source to predict the modulator characteristics. The effects of the thin buffer layer and anisotropy of the LiNbO3 crystal (x-cut and z-cut) are discussed. The comparison between the FDTD and quasi-static results shows good agreement. In this paper, the efficient modeling technique of the FDTD method for the coplanar waveguide (CPW) structures based on an anisotropic substrate with a thin buffer layer is developed. (C) 2003 Wiley Periodicals, Inc.

关键词： coplanar waveguide anisotropic substrate finite-difference time-domain method

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Stepped-frequency GPR system for landmine detection

Stepped-frequency GPR system for landmine detection

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Conference on Detection and Remediation Technologies for Mines and Minelike Targets VIII

作者： Sato, M Zeng, ZF Fang, GG Feng, X Tohoku Univ Ctr NE Asian Studies Sendai Miyagi 9808576 Japan

ISBN: (纸本)0819449490

A project for developing a compact size GPR system for landmine detection was started. It will be based on stepped-frequency radar system for wider application in various kinds of soil conditions. We have developed a prototype stepped-frequency GPR system for fundamental evaluation of the system. This system uses an array of broadband Vivalidi antennas and operates at 2-6GHz. The system was tested in laboratory and could be used for imaging buried mine-Re targets by high resolution. Series of test was carried out by using sand with rough surface and inhomogeneous soil. Array signal processing is useful for reduction of clutter from the rough grounds surface.

关键词： Antennas General packet radio service Land mines Radar Signal processing Chemical mechanical planarization finite-difference time-domain method Imaging systems Receivers Transmitters

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Passive detection of buried structures using elastic waves

Passive detection of buried structures using elastic waves

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Conference on Unattended Ground Sensor Technologies and Applications V

作者： Norville, PD Scott, WR Georgia Inst Technol Sch Elect & Comp Engn Atlanta GA 30332 USA

ISBN: (纸本)0819449504

An investigation of the feasibility of detecting structures buried underground through passive listening techniques will be presented. Passive detection of structures will be analyzed using elastic wave sources originating inside the structure and from sources exterior to the structure and on the surface. The primary method of investigation will be numerical models using the finite-difference time-domain method (FDTD). A source inside the structure excites elastic waves in the structure, a portion of which travel upward along the walls of the structure and onward to the surface. An alternate form of excitation is a source such as a train, large vehicle, or an explosion located on the surface, away from the structure. Waves from this source interact with the structure and a portion of them travel up from the structure to the surface. An array of sensors is constructed to map the field at the surface and to determine the location and basic characteristics of the structure. Generally, structures examined will be on the order of the size of an underground tunnel complex or buried room and elastic wave sources will be in the low frequency range of large machinery or vehicles.

关键词： Wave propagation finite-difference time-domain method Particles Sensors Velocity measurements Data modeling 3D modeling Reflection Interfaces Wave sensors

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Full wave two- and three-dimensional field analysis of periodic active and passive optical structures

Full wave two- and three-dimensional field analysis of perio...

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Conference on Physics and Simulation of Optoelectronic Devices XI

作者： Akbari, M Schünemann, K Burkhard, H Univ Tehran Tehran 14174 Iran

A rigorous and numerically efficient method for 2D and 3D analysis of general periodic structures is described and applied to a number of passive and active optical devices.

ISBN: (纸本)0819447862

A rigorous and numerically efficient method for 2D and 3D analysis of general periodic structures is described and applied to a number of passive and active optical devices.

关键词： Waveguides Wave propagation 3D modeling Dielectrics Reflection Magnetism Active optics finite-difference time-domain method Radio propagation Visualization

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Rigorous simulation of lithographic exposure of photoresist over a nonplanar wafer

Rigorous simulation of lithographic exposure of photoresist ...

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19th Congress of the International-Commission-for-Optics

作者： Erdmann, A Kalus, C Fraunhofer Inst Integrated Circuits Device Technol Div IIS B D-91058 Erlangen Germany

ISBN: (纸本)0819445967

Lithographic exposures belong to the most critical process steps in the manufacturing of microelectronic circuits. Almost all exposures are performed over nonplanar wafers. The backscattering of light from topographic features on these wafers is of increasing concern for the accuracy and stability of lithographic processes. We combine standard imaging theory and finite-difference time-domain (FDTD) algorithms to simulate several typical geometries. Consequences with respect to typical lithographic process parameters are discussed.

关键词： Lithography Semiconducting wafers Photoresist materials Photomasks Diffraction finite-difference time-domain method Computer simulations Microelectronics Silicon Light wave propagation

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Simulation of nonlinear optical waveguide structure by using FDTD technique

Simulation of nonlinear optical waveguide structure by using...

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19th Congress of the International-Commission-for-Optics

作者： Shabat, MM Barakat, NM Al-azab, S Jäger, D Islamic Univ Gaza Dept Phys Gaza Israel

ISBN: (纸本)0819445967

The finite difference-time domain Technique is at present the most widely used tool employed in the study of light propagation in various photonic waveguide structure [1-4]. The present paper proposes a new approach of FDTD technique to simulate the wave equation in a four optical waveguiding rectangular structure. We derive the stability condition to achieve the stability in nonlinear media region, we also check that the wave equation used is consistence and convergent with the approximate finite difference equation. Our method is tested against some previous problems and we found a high degree of accuracy, moreover it is easy for programming. Numerical results are illustrated for a rectangular waveguide with four layers, where one of these layers is a nonlinear medium.

关键词： finite-difference time-domain method Waveguides Erbium Optical simulations Light wave propagation Nonlinear optics Computer programming Geometrical optics Mathematics Radio propagation

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Dynamical model of two-dimensional self-induced-transparency-solitons and pattern formation in nonlinear optical waveguides and semiconductor microcavities

Dynamical model of two-dimensional self-induced-transparency...

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Conference on Physics and Simulation of Optoelectronic Devices XI

作者： Slavcheva, GM Arnold, JM Ziolkowski, RW Univ Glasgow Dept Elect & Elect Engn Glasgow G12 8QQ Lanark Scotland

ISBN: (纸本)0819447862

We propose a novel multidimensional dynamical model for description of the coherent interactions of ultrashort high-intensity optical pulses with the resonant nonlinearities in planar optical waveguides and semiconductor microresonators. The model is based on the self-consistent solution of the full-wave vectorial Maxwell's equations coupled via polarization source terms to the evolution equations of a discrete multilevel quantum system. The latter are derived employing a group-theoretical approach exploiting symmetric properties of the system Hamiltonian. In particular, the resonant nonlinearity is modelled by a degenerate three-level system of saturable absorbers in order to account for the two-dimensional medium polarization. The resulting Maxwell-pseudospin equations are solved in the time domain using the finite-difference time-domain (FDTD) method. The model is applied for studying conditions of onset of self-induced transparency (SIT) lossless regime of propagation. Numerical evidence of multidimensional solitons localized both in space and in time is given for the planar optical waveguides. Pattern formation and cavity SIT-soliton formation are demonstrated for the special case of a passive semiconductor microcavity filled with saturable absorbers.

关键词： self-induced transparency ultrashort optical pulses Maxwell-Bloch system multidimensional solitons light bullets resonant nonlinearities semiconductor microcavities spatiotemporal dynamics finite-difference time-domain method

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Four-channel strip power dividers 4

Four-channel strip power dividers

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4th International Conference on Antenna Theory and Techniques

作者： Martynyuk, SE Stepanenko, PJ Tereshchenko, VM Natl Tech Univ Ukraine Kiev Polytech Inst Dept Theoret Backgrounds Radio Engn Kiev Ukraine

ISBN: (纸本)0780378814

The finite-difference time-domain method has been applied successfully for electrodynamic analysis of the four-channel strip power divider taking into account finite losses in dielectric substrate and the presence of metal box. A test sample of the power divider was designed and manufactured. Results of its theoretical and experimental investigations are in good agreement.

关键词： multichannel power divider a strip line finite-difference time-domain method

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FDTD method based electromagnetic solver for printed-circuit analysis 4

FDTD method based electromagnetic solver for printed-circuit...

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4th International Conference on Antenna Theory and Techniques

作者： Gnilenko, AB Paliy, OV Dniepropetrovsk Natl Univ Dept Radio Phys Dnepropetrovsk Ukraine

ISBN: (纸本)0780378814

An electromagnetic, solver for printed-circuit analysis is presented. The. electromagnetic simulator is based on finite-difference time-domain method with first-order Mur's absorbing boundary conditions.. The solver environment comprises a layout graphic editor for circuit topology preparation and a data postprocessor for calculation result presentation. The solver has been applied. to the analysis of printed-curcuit components such as printed antenna, microstrip discontinuities, etc.

关键词： finite-difference time-domain method Maxwell's equations absorbing boundary conditions microstrip discontinuity printed antenna

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Extension of R-FDTD algorithm for solving Maxwell equations in homogeneous isotropic lossy media 3

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3rd Asia-Pacific Conference on Environmental Electromagnetics

作者： Yu, TB Zhou, BH Chen, B Nanjing Engn Inst EMP Lab Nanjing 210007 Peoples R China

ISBN: (纸本)7563508023

An attractive advance in the use of the finite-difference time-domain (FDTD) method has been the introduction of the reduced FDTD (R-FDTD) algorithm, which can reduce computer memory requirement in the storage of the fields by up to 33%. The initial implementation is limited for solving Maxwell equations in isotropic lossless media. This paper introduces an extension of R-FDTD algorithm. The proposed extension uses FDTD formula of Maxwell curl equations to eliminate one component each of E and H. This enables us have a memory-efficient formulation for solving Maxwell equations in homogeneous isotropic lossy media.

关键词： Maxwell equations finite difference time-domain analysis absorbing media R-FDTD algorithm homogeneous isotropic lossy media finite-difference time-domain method reduced FDTD E component H component computer memory requirement Maxwell curl equations

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