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While the absorption of light is ubiquitous in nature and in applications,the question remains how absorption modifies the transmission channels inrandom media. We present a numerical study on the effects of optical absorptionon the maximal transmission and minimal reflection channels in atwo-dimensional disordered waveguide. In the weak absorption regime, where thesystem length is less than the diffusive absorption length, the maximaltransmission channel is dominated by diffusive transport and it is equivalentto the minimal reflection channel. Its frequency bandwidth is determined by theunderlying quasimode width. However, when the absorption is strong, lighttransport in the maximal transmission channel undergoes a sharp transition andbecomes ballistic-like transport. Its frequency bandwidth increases withabsorption, and the exact scaling varies with the sample's realization. Theminimal reflection channel becomes different from the maximal transmissionchannel and becomes dominated by absorption. Counterintuitively, we observe insome samples that the minimum reflection eigenvalue increases with absorption.Our results show that strong absorption turns open channels in random mediafrom diffusive to ballistic-like.

Transmission channels for light in absorbing random media: from diffusive to ballistic-like transport