title: Light propagation in a resonantly absorbing waveguide array.
abstract: 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.
authors.affiliation: State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen University, Guangzhou 510275, China.
authors.forename: Mingneng
authors.initials: M
authors.lastname: Feng
authors.forename: Yikun
authors.initials: Y
authors.lastname: Liu
authors.forename: Yongyao
authors.initials: Y
authors.lastname: Li
authors.forename: Xiangsheng
authors.initials: X
authors.lastname: Xie
authors.forename: Jianying
authors.initials: J
authors.lastname: Zhou