Discrimination between two mechanisms of surface-scattering in a single-mode waveguide

TL;DR

This paper investigates how two distinct surface-scattering mechanisms affect waveguide transport, showing they can operate separately under certain conditions, which is important for understanding real-world waveguide behavior.

Contribution

It demonstrates that amplitude and square-gradient scattering mechanisms can be distinguished and operate independently in specific wave number intervals, considering realistic correlated profiles.

Findings

Mechanisms can operate separately in certain wave number ranges.

Long-range correlations influence scattering behavior.

Distinct scattering regimes impact waveguide transport.

Abstract

Transport properties of a single-mode waveguide with rough boundary are studied by discrimination between two mechanisms of surface scattering, the amplitude and square-gradient ones. Although these mechanisms are generically mixed, we show that for some profiles they can separately operate within non-overlapping intervals of wave numbers of scattering waves. This effect may be important in realistic situations due to inevitable long-range correlations in scattering profiles.