Optics of surfaces and interfaces

X-ray surface guided modes on a boundary between two different periodical multilayer structures

I. R. Prudnikov^ab, N. N. Usmanov<sup>a

a</sup> Lomonosov Moscow State University, Faculty of Physics, 119991 Moscow, Russia
^b National Engineering Physics Institute "MEPhI", 115409 Moscow, Russia

Abstract: On the basis of an analytical approach and with the help of numerical simulations, it is shown that the excitation of an X-ray surface guided mode is possible under certain conditions on a boundary between two different periodical multilayer structures (multilayer mirrors). This mode propagates along the boundary between the two structures and its intensity decreases exponentially with increasing the distance from a boundary surface deep into each of them. An indication of the appearance of the guided wave is a resonant dip in an X-ray specular reflectivity curve from a set of the two periodical multilayer mirrors that are placed consecutively, one after another, on a substrate. An influence of the thicknesses of films, forming one bilayer, and layer materials in the multilayer structures on peculiarities of a surface wave excitation is investigated.

Keywords: periodical multilayer structure, interface, X-ray surface guided mode, Bragg reflection.

Received: 29.03.2023
Revised: 03.12.2023
Accepted: 09.12.2023

DOI: 10.61011/OS.2024.02.57778.4765-23

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