TITLE:
Delocalization of Acoustic Waves in a One-Dimensional Random Dimer Media
AUTHORS:
S. Brezini, A. Brezini
KEYWORDS:
Acoustic Wave; Disorder; Localizatiuon; Random Dimer
JOURNAL NAME:
Open Journal of Acoustics,
Vol.3 No.2,
June
21,
2013
ABSTRACT: The propagation of classical waves in one-dimensional random media is examined in presence of short-range correlation in disorder. A classical analogous of the Kronig-Penney model is proposed by means a chain of repeated sub-systems, each of them constituted by a mass connected to a rigid foundation by a spring. The masses are related to each other by a string submitted to uniform tension. The nature of the modes is investigated by using different transfer matrix formalisms. It is shown that in presence of short-range correlation in the medium which corresponds to the RD model- the localization-delocalization transition occurs at a resonance frequency . The divergence of near is studied, and the critical exponent that characterizes the power-law behavior of near is estimated. Moreover an exact analytical study is carried out for the delocalization properties of the waves in the RD media. In particular, we predict the resonance frequency at which the waves can propagate in the entire chain. The transmission properties of the system are numerically studied using a statistical procedure yielding various physical magnitudes such the transmission coefficient, the localization length and critical exponents. In particular, it is shown that the presence of correlation in disorder restores a large number of extended Bloch-like modes in contradiction with the general conclusion of the localization phenomenon in one-dimensional systems with correlated disorder.