Publication:
Scattering of a short electromagnetic pulse from a Lorentz–Duffing film: Theoretical and numerical analysis

Файлы
W2963880853.pdf(745.41 KB)
Дата
2019
Авторы
Brio, M.
Caputo, J. -G.
Gwirtz, K.
Liu, J.
Maimistov, A.
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Научные группы
Организационные подразделения
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Организационная единица
Институт лазерных и плазменных технологий
Стратегическая цель Института ЛаПлаз – стать ведущей научной школой и ядром развития инноваций по лазерным, плазменным, радиационным и ускорительным технологиям, с уникальными образовательными программами, востребованными на российском и мировом рынке образовательных услуг.
Выпуск журнала
Аннотация
© 2019 We combine scattering theory, Fourier, traveling wave and asymptotic analyses together with numerical simulations to present interesting and practically useful properties of femtosecond pulse interaction with thin films. The dispersive material is described by a single resonance Lorentz model and its nonlinear extension with a cubic Duffing-type nonlinearity. A key feature of the Lorentz dielectric function is that its real part becomes negative between its zero and its pole, generating a forbidden region. We illustrate numerically the linear interaction of the pulse with the film using both scattering theory and Fourier analysis. Outside this region we show the generation of a sequence of pulses separated by round trips in the Fabry–Perot cavity due to multiple reflections. When the pulse spectrum is inside the forbidden region, we observe total reflection. Near the pole of the dielectric function, we demonstrate the slowing down of the pulse (group velocity tending to zero) in the medium that behaves as a high-Q cavity. We use the combination of analysis and simulations in the linear regime to validate the delta function approximation of the thin layer; this collapses the forbidden region to a single resonant point of the spectrum. We also study the single cycle pulse interaction with a thin film and show three distinct types of reflection: half-pulse, sinusoidal wave train and cosine wavelet. Finally we analyze the influence of a strong nonlinearity and observe that the film switches from reflecting to transparent.
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Цитирование
Scattering of a short electromagnetic pulse from a Lorentz–Duffing film: Theoretical and numerical analysis / Brio, M. [et al.] // Wave Motion. - 2019. - 89. - P. 43-56. - 10.1016/j.wavemoti.2019.02.007
URI
https://www.doi.org/10.1016/j.wavemoti.2019.02.007
 https://www.scopus.com/record/display.uri?eid=2-s2.0-85062867931&origin=resultslist
 http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS_CPL&DestLinkType=FullRecord&UT=WOS:000474675800004
 https://openrepository.mephi.ru/handle/123456789/16651
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