
TL;DR
This paper introduces a novel optical method to visually observe Anderson localization by tuning wavelength or incidence angle, and presents a theoretical framework to distinguish localization effects from absorption in light propagation.
Contribution
It proposes a new optical scheme for directly observing Anderson localization and develops a theoretical model to differentiate localization from absorption effects.
Findings
A system where only one wavelength transmits perfectly, others are localized.
Development of a theoretical framework for average optical transmission in disordered media.
Clarification of localization effects separate from absorption signatures.
Abstract
Anderson localization was discovered 50 years ago to describe the propagation of electrons in the presence of disorder. The main prediction back then, was the existence of disorder induced localized states, which do not conduct electricity. Many years later it turns out, that the concept of Anderson localization is much more general and applies to almost any type of propagation in time or space, when more than one parameter is relevant (like phase and amplitude). Here we propose a new optical scheme to literally see Anderson localization by varying the optical wavelength or angle of incidence to tune between localized and delocalized states. The occurrence of Anderson localization in the propagation of light, in particular, has become the focus of tremendous interest due to the emergence of new optical technologies and media, such as low dimensional and disordered optical lattices.…
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