Open AccessLight propagation in a resonantly absorbing waveguide array
Author(s) -
Mang Feng,
Yikun Liu,
Yongyao Li,
Xiangsheng Xie,
Jianying Zhou
Publication year - 2011
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.19.007222
Subject(s) - optics , waveguide , diffraction , refractive index , dispersion (optics) , absorption (acoustics) , physics , spectral line , line (geometry) , materials science , geometry , mathematics , astronomy
Light propagation behavior in a resonantly absorbing waveguide array is analyzed. Both a Lorentzian line shape and an inhomogeneous broadened absorbing line shape are considered, with their imaginary and real part of the refractive index determined by a Kramers-Kronig relationship. The diffracted wave is shown to have the frequency spectra determined by the material absorption, dispersion as well as the waveguide structure. An interesting phenomenon is that a spectral hole is produced and becomes deeper in the diffraction spectrum as the thickness of the resonantly absorbing waveguide array increases. The experimental measurements conducted in a waveguide array are found to be in good agreement with the numerical results.