Open AccessPropagation of optical pulses through one-dimensional photonic crystals with a dispersive and gain defect layer
Author(s) -
Yu Tian-Bao,
Nian-Hua Liu
Publication year - 2004
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.53.3049
Subject(s) - poynting vector , superluminal motion , superposition principle , optics , dispersion (optics) , physics , pulse (music) , phase (matter) , group velocity , photonic crystal , photonics , lorentz transformation , fourier transform , layer (electronics) , materials science , quantum mechanics , magnetic field , detector , composite material
The propagation of a pulse through onedimensional photonic crystals with a dispersive and gain defect layer is discussed. The dispersion and gain of the defect layer is described by Lorentz oscillator model. It is found that the pulse pea k exhibits subluminal and superluminal behaviors with varying strength of the os cillator. The Poynting vector and energy velocity can be negative, but the latte r is never faster than the vacuum light speed c. The advance or delay of the pulse peak is a result of the coherent superposition of all Fourier components which experienced different phase shift and different amplification in the medium.