Confinement of phonon propagation in laser deposited tungsten/polycarbonate multilayers

Nanoscale multilayer thin films of W and PC (Polycarbonate) show, due to the great difference of the components' characteristics, fascinating properties for a variety of possible applications and provide an interesting research field, but are hard to fabricate with low layer thicknesses. Becaus...

Full description

Saved in:
Bibliographic Details
Published inNew journal of physics Vol. 18; no. 9; pp. 92002 - 92010
Main Authors Döring, Florian, Ulrichs, Henning, Pagel, Sinja, Müller, Markus, Mansurova, Maria, Müller, Matthias, Eberl, Christian, Erichsen, Torben, Huebner, Dennis, Vana, Philipp, Mann, Klaus, Münzenberg, Markus, Krebs, Hans-Ulrich
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 01.09.2016
Subjects
Dynamic structural analysis
Fluence
Lasers
Multilayers
phonon localization
phonon propagation
Phonons
Physics
Polycarbonate resins
Propagation
Properties (attributes)
Pulsed laser deposition
Pulsed lasers
pump-probe spectroscopy
Structural design
Thickness
Thin films
Tungsten
Online AccessGet full text

Cover

More Information
Summary:Nanoscale multilayer thin films of W and PC (Polycarbonate) show, due to the great difference of the components' characteristics, fascinating properties for a variety of possible applications and provide an interesting research field, but are hard to fabricate with low layer thicknesses. Because of the great acoustic mismatch between the two materials, such nanoscale structures are promising candidates for new phononic materials, where phonon propagation is strongly reduced. In this article we show for the first time that W/PC-multilayers can indeed be grown with high quality by pulsed laser deposition. We analyzed the polymer properties depending on the laser fluence used for deposition, which enabled us to find best experimental conditions for the fabrication of high-acoustic-mismatch W/PC multilayers. The multilayers were analyzed by fs pump-probe spectroscopy showing that phonon dynamics on the ps time-scale can strongly be tailored by structural design. While already periodic multilayers exhibit strong phonon localization, especially aperiodic structures present outstandingly low phonon propagation properties making such 1D-layered W/PC nano-structures interesting for new phononic applications.
Bibliography:NJP-105605.R1
ISSN:1367-2630
1367-2630
DOI:10.1088/1367-2630/18/9/092002