Volume 105, Number 3, February 2014
|Number of page(s)||6|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||19 February 2014|
Numerical study of Anderson localization of terahertz waves in disordered waveguides
1 Physics Department, University of Fribourg - Chemin du Musée 3, 1700 Fribourg, Switzerland
2 Institute of Applied Physics, University of Bern - Siedlerstrasse 5, 3012 Bern, Switzerland
3 Université Grenoble 1/CNRS, LPMMC UMR 5493 - B.P. 166, 38042 Grenoble, France
Received: 18 October 2013
Accepted: 21 January 2014
We present a numerical study of electromagnetic wave transport in disordered quasi–one-dimensional waveguides at terahertz frequencies. Finite element method calculations of terahertz wave propagation within LiNbO3 waveguides with randomly arranged air-filled circular scatterers exhibit an onset of Anderson localization at experimentally accessible length scales. Results for the average transmission as a function of waveguide length and scatterer density demonstrate a clear crossover from diffusive to localized transport regime. In addition, we find that transmission fluctuations grow dramatically when crossing into the localized regime. Our numerical results are in good quantitative agreement with theory over a wide range of experimentally accessible parameters both in the diffusive and localized regime opening the path towards experimental observation of terahertz wave localization.
PACS: 42.25.Dd – Wave propagation in random media / 42.25.Bs – Wave propagation, transmission and absorption / 71.55.Jv – Disordered structures; amorphous and glassy solids
© EPLA, 2014
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