Discrimination of surface-scattering mechanisms in waveguides with a rough boundary of rectangular power spectrum

• Published in: Physica status solidi. C Vol. 9; no. 6; pp. 1507 - 1514
• Main Authors: Rendón, M., Makarov, N. M.
• Format: Journal Article
• Language: English
• Published: Berlin WILEY-VCH Verlag 01.06.2012; WILEY‐VCH Verlag; Wiley Subscription Services, Inc
• Subjects: localization and delocalization effects; rough waveguides; surface scattering
• ISSN: 1862-6351; 1610-1642
• DOI: 10.1002/pssc.201100708

We study transport properties of a single‐mode waveguide with rough boundary. As is known, propagating waves in such waveguides are attenuated because of two mechanisms of surface scattering: the amplitude mecha‐ nism and the square‐gradient mechanism. While the former is known since long ago, the latter was recently predicted. In general, they compete with one another and, then, it is difficult to study them individually. Here, by means of appropriate long‐range correlations specified by two correlation parameters and embedded in the disordered boundary of the waveguide, we man‐ age to separate these mechanisms and stop the competition. Specifically, we arrange different intervals of wave numbers in which they manifest themselves alone. This situation allows one to study the different nature of these scattering mechanisms. (© 2012 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)