Zobrazeno 1 - 10
of 58
pro vyhledávání: '"Richard W. Ziolkowski"'
Autor:
Bruce A. Webb, Richard W. Ziolkowski
Publikováno v:
WiSEE
© 2018 IEEE. As a spacecraft enters a planetary atmosphere, severe attenuation of communication signals can occur due to the formation of a plasma sheath around its airframe. The resulting communications blackout has known negative consequences. Ear
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4b31ccc28843e1b78da34e9f1edfec4d
https://hdl.handle.net/10453/132934
https://hdl.handle.net/10453/132934
Publikováno v:
2016 International Workshop on Antenna Technology (iWAT).
© 2016 IEEE. Recent developments in the areas of metamaterials and high impedance ground planes (HIGPs) have created new opportunities for the development of novel multi-functional aerospace materials. One niche application of such materials is the
Autor:
Richard W. Ziolkowski, Cynthia Kaus
Publikováno v:
Electromagnetics. 28:42-53
A discrete differential form approach to solving Maxwell's equations on unstructured meshes is presented. Discrete representations of differential forms, the underlying manifolds, and associated operators are developed. The discrete boundary, cobound
Publikováno v:
Microwave and Optical Technology Letters. 48:348-354
An ultra-wideband antenna is designed using genetic optimization and the finite-difference-time-domain (FDTD) method. Efficiency is enhanced by using the Green's function method (GFM) as an absorbing boundary condition (ABC) close to the antenna surf
Publikováno v:
Slavcheva, G, Arnold, J M & Ziolkowski, R 2003, ' Ultrashort pulse lossless propagation through a degenerate three-level medium in nonlinear optical waveguides and semiconductor microcavities ', IEEE Journal of Selected Topics in Quantum Electronics, vol. 9, no. 3, pp. 929-938 . https://doi.org/10.1109/JSTQE.2003.818844
The authors develop and apply a novel group-theoretical approach for studying the coherent dynamics of ultrashort pulse propagation in nonlinear optical waveguides and passive semiconductor microresonators. The resonant nonlinearity is modeled by a d
Publikováno v:
Non-Diffracting Waves
© 2014 Wiley-VCH Verlag GmbH & Co. KGaA. Summary: This chapter demonstrates that one can derive nondispersive localized wave packet solutions to the Schrödinger equation. Two ansätze are formulated that allow a large class of infinite- and finite-
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a5c168db1a6b64c017755411e561ff4b
https://doi.org/10.1002/9783527671519.ch7
https://doi.org/10.1002/9783527671519.ch7
Autor:
Richard W. Ziolkowski, D.C. Wittwer
Publikováno v:
IEEE Transactions on Antennas and Propagation. 48:192-199
A two time-derivative Lorentz material (2TDLM) is introduced to define polarization and magnetization fields that lead to an absorbing layer that can be matched to a lossy dielectric medium. The 2TDLM is a generalization of the successful uniaxial po
Autor:
Richard W. Ziolkowski
Publikováno v:
Computer Methods in Applied Mechanics and Engineering. 169:237-262
Absorbing boundary conditions (ABCs) for the finite-difference time-domain (FDTD) method are introduced which arise from surrounding the simulation space with lossy Maxwellian material layers. Generalizations of the standard Lorentz dispersion materi
Autor:
Richard W. Ziolkowski, Masahiro Tanaka
Publikováno v:
Optical and Quantum Electronics. 31:843-855
Finite two-dimensional photonic bandgap (PBG) structures were analyzed with a finite-dif- ference time-domain (FDTD) full wave, vector Maxwell equation simulator. Removal of particular portions of these PBG structures lead to interesting sub-micron-s
Autor:
Tao Liang, Richard W. Ziolkowski
Publikováno v:
Microwave and Optical Technology Letters. 17:17-23
The effects of dispersion on the performance of finite-length grating-assisted output couplers drien by ultrafast pulses are studied. Two different FDTD formulations of Lorentz dispersion are treated, and both dispersiew aeguides and grating teeth ar