Localized mode hybridization by fine tuning of two-dimensional random media.
We study numerically the interaction of spatially localized modes in strongly scattering two-dimensional (2D) media. We move eigenvalues in the complex plane by changing gradually the index of a single scatterer. When spatial and spectral overlap is sufficient, localized states couple, and avoided level crossing is observed. We show that local manipulation of the disordered structure can couple several localized states to form an extended chain of hybridized modes crossing the entire sample, thus changing the nature of certain modes from localized to extended in a nominally localized disordered system. We suggest such a chain in 2D random systems is the analog of one-dimensional necklace states, the occasional open channels predicted by Pendry [Physics 1, 20 (2008).] through which the light can sneak through an opaque medium.
Laboratoire de Physique de la Matière Condensée, Université de Nice-Sophia Antipolis-CNRS UMR7336, Parc Valrose, 06108 Nice Cedex 02, France.
Laurent
L
Labonté
Christian
C
Vanneste
Patrick
P
Sebbah