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- W2068670632 abstract "We study the traversal times of electromagnetic pulses across dispersive media with negative dielectric permittivity(e) and magnetic permeability (μ) parameters. First we investigate the transport of optical pulses throughan electrical plasma and a negative refractive index medium (NRM) of infinite and semi-infinite extents whereno resonant effects come into play. The total delay time of the pulse constitutes of the group delay time and thereshaping delay time as analyzed by Peatross et al.1 For evanescent waves, even with broadband width, the totaldelay time is negative for an infinite medium whereas it is positive for the semi-infinite case. Evidence of theHartman effect is seen for small propagation distance compared to the free space pulse length. The reshapingdelay mostly dominates the total delay time in NRM whereas it vanishes when e(ω) = μ(ω).Next we present results on the propagation times through a dispersive slab. While both large bandwidthand large dissipation have similar effects in smoothening out the resonant features that appear due to Fabry-Perot resonances, large dissipation can result in very small or even negative traversal times near the resonantfrequencies. We investigate the traversal and the Wigner delay times for obliquely incident pulses. The couplingof evanescent waves to slab plasmon polariton modes results in large traversal times at the resonant conditions.We also find that the group velocity mainly contributes to the delay time for pulse propagating across a slabwith refractive index (n) = -1. The traversal times are positive and subluminal for pulses with sufficiently largebandwidths." @default.
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- W2068670632 date "2008-04-25" @default.
- W2068670632 modified "2023-09-23" @default.
- W2068670632 title "Traversal of pulses through negative (ε, μ) materials" @default.
- W2068670632 doi "https://doi.org/10.1117/12.780801" @default.
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