Time for pulse traversal through slabs of dispersive and negative ({epsilon}, {mu}) materials

Journal Article · Sat Dec 15 04:00:00 EST 2007 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.76.063807· OSTI ID:21140700

Nanda, Lipsa; Ramakrishna, S Anantha ^[1]

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1. Department of Physics, Indian Institute of Technology Kanpur, Kanpur 208016 (India)

The traversal times for an electromagnetic pulse traversing a slab of dispersive and dissipative material with negative dielectric permittivity ({epsilon}) and magnetic permeability ({mu}) have been calculated by using the average flow of electromagnetic energy in the medium. The effects of bandwidth of the pulse and dissipation in the medium have been investigated. While both large bandwidth and 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 resonant frequencies. We have also investigated the traversal times and Wigner delay times for obliquely incident pulses and evanescent pulses. The coupling to slab plasmon-polariton modes in frequency ranges with negative {epsilon} or {mu} is shown to result in large traversal times at the resonant conditions. We also find that the group velocity mainly contributes to the delay times for pulses propagating across a slab with n=-1. We have checked that the traversal times are positive and subluminal for pulses with sufficiently large bandwidths.

• OSTI ID: 21140700
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 6 Vol. 76; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COUPLING
DIELECTRIC MATERIALS
ELECTROMAGNETIC PULSES
FREQUENCY RANGE
LIGHT TRANSMISSION
MAGNETIC SUSCEPTIBILITY
PERMITTIVITY
PLASMONS
POLARONS
RESONANCE
SLABS
VELOCITY
WAVE PROPAGATION