2024/06/10 by Ho-Chun Lin, Lin, Ho-Chun, Chia Wei Hsu +1 · 1 citation
Engineering · Physics and Astronomy · #Computational Physics (physics.comp-ph) #Disordered Systems and Neural Networks (cond-mat.dis-nn) #Electromagnetic Scattering and Analysis #FOS: Physical sciences #Microwave Imaging and Scattering Analysis #Optics (physics.optics) #Random lasers and scattering media
paper · pdf · doi:10.48550/arxiv.2406.06727
openalex publication_date 2024/06/10 · openalex created_date 2024/06/13 · openalex updated_date 2026/07/28
A striking prediction from the random matrix theory in mesoscopic physics is the existence of "open channels": waves that can use multipath interference to achieve perfect transmission across an opaque disordered medium even in the multiple-scattering regime. Realization of such open channels requires a coherent control of the complete incident wavefront. To date, the open channels have only been demonstrated in scalar two-dimensional (2D) structures, both experimentally and with numerical studies. Here, we utilize a recently proposed "augmented partial factorization" full-wave simulation method to compute the scattering matrix from 3D vectorial Maxwell's equations and demonstrate the existence of open channels in 3D disordered media. We examine the spatial profile of such open channels, demonstrate the existence of a bimodal transmission eigenvalue distribution with full control, and study the effects of incomplete polarization control and of a finite illumination area. This study confirms the validity of the random matrix theory in vectorial systems. The simulation framework provides full access to the complex multi-channel wave transport in 3D disordered systems, filling the gap left by experimental capabilities.