We show that there is a general limit to the performance of linear optical components, based
only on their size, shape, and dielectric constants. The limit is otherwise independent of the …

In this paper we review the main results on slow and fast light induced by coherent
population oscillations in optical fibres doped with erbium ions. We explain the physics …

We present an analysis of the propagation of light pulses through materials possessing
extreme values of the group velocity. We begin with an analysis of the behaviour that occurs …

We show that negative refraction in materials can occur at frequencies ω where the real
parts of the permittivity ɛ (ω) and the permeability μ (ω) have different signs and that light …

We report the experimental demonstration of the superluminal propagation of multi-spatial-
mode images via four-wave mixing in hot atomic vapor, in which all spatial sub-regions …

When a pulse superposed on a cw background propagates through an erbium-doped fiber
amplifier with a negative group velocity, either pulse broadening or pulse compression can …

In connection with the experiments recently achieved on doped crystals, biological samples,
doped optical fibers, and semiconductor heterostructures, we revisit the theory of the …

Since Biot's first work on acoustic waves in non-dissipative solid media, it has been known
that the group velocity of bulk acoustic waves coincides with the velocity of wave energy …

Metamaterials mimicking dynamic spacetime, D-brane and noncommutativity in string theory
- ScienceDirect Skip to main contentSkip to article Elsevier logo Journals & Books Help …

We experimentally and theoretically study the propagation of a 1536 nm light pulse
superposed on a continuous wave background in a highly doped erbium fiber pumped at …