M. Centini

Group velocity, energy velocity, and superluminal propagation in finite photonic band-gap structures

We have analyzed the notions of group velocity

Engineering the second harmonic generation pattern from coupled gold nanowires

{V}_{g}

Birefringence in one-dimensional finite photonic bandgap structure

and energy velocity

Femtosecond pulses chirping compensation by using one-dimensional compact multiple-defect photonic crystals

{V}_{E}

Second harmonic generation in GaN∕Al50Ga50N films deposited by metal-organic chemical vapor deposition

for light pulses propagating inside one-dimensional photonic band gap structures of finite length. We find that the two velocities are related through the transmission coefficient t as

Polarization insensitive infrared absorbing behaviour of one-dimensional multilayer stack: a fractal approach

{V}_{E}=|t{|}^{2}{V}_{g}.

Measurement of the circular dichroism in the second harmonic optical signal produced by Au covered self ordered dielectric nanospheres

It follows that

Second harmonic generation from metallic 2D scatterers

{V}_{E}{=V}_{g}

Tailoring of the circular dichroism produced by Au covered self-ordered dielectric nanospheres

only when the transmittance is unity

Symmetry breaking in the second harmonic field of self-Assembled metallic nanostructures

(|t{|}^{2}=1).