Abstract:
:Transmission through disordered samples can be controlled by illuminating a sample with waveforms corresponding to the eigenchannels of the transmission matrix (TM). But can the TM be exploited to selectively excite quasi-normal modes and so control the spatial profile and dwell time inside the medium? We show in microwave and numerical studies that spectra of the TM can be analyzed into modal transmission matrices of rank unity. This makes it possible to enhance the energy within a sample by a factor equal to the number of channels. Limits to modal selectivity arise, however, from correlation in the speckle patterns of neighboring modes. In accord with an effective Hamiltonian model, the degree of modal speckle correlation grows with increasing modal spectral overlap and non-orthogonality of the modes of non-Hermitian systems. This is observed when the coupling of a sample to its surroundings increases, as in the crossover from localized to diffusive waves.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Davy M,Genack AZdoi
10.1038/s41467-018-07180-3subject
Has Abstractpub_date
2018-11-09 00:00:00pages
4714issue
1issn
2041-1723pii
10.1038/s41467-018-07180-3journal_volume
9pub_type
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