Angle dependence of the frequency correlation in random photonic media: Diffusive regime and its breakdown near localization

Article

关键词: STRONGLY SCATTERING MEDIA;    WEAK-LOCALIZATION;    DISORDERED MEDIA;    INTENSITY CORRELATIONS;    MULTIPLE-SCATTERING;    LIGHT-SCATTERING;    ENHANCED BACKSCATTERING;    COHERENT BACKSCATTERING;    WAVE-PROPAGATION;    FLUCTUATIONS;   

DOI  :  10.1103/PhysRevB.84.035106

来源: SCIE

【 摘 要 】

The frequency correlations of light in complex photonic media are of interest as a tool for characterizing the dynamical aspects of light diffusion. We demonstrate here that the frequency correlation shows a pronounced angle dependence both in transmission and in reflection geometries. Using a broadband white-light supercontinuum, this angle dependence is characterized and explained theoretically by a combination of propagation effects outside the medium and coherent backscattering. We report a strong dependence of the coherent backscattering contribution on the scattering strength that cannot be explained by the diffusion theory. Our results indicate that coherent backscattering of the frequency correlation forms a sensitive probe for the breakdown of the diffusive regime near localization.

【 授权许可】

Free