Abstract
Abstract The fascinating relationship between structure and property in nanowires has enabled a wealth of applications in photonics and electronics. The behavior of phonons in nanowires is also modified compared to their bulk counterparts. In this review, we provide an overview of the recent efforts to investigate the properties of acoustic phonons in nanowires using ultrafast optical methods. In particular, we focus on the calculation of the modified phonon dispersion in nanowires and how to address them optically. We then discuss experimental investigations in arrays of nanowires and a single nanowire. The analysis of phonon behavior reveals the possibility to perform advanced mechanical characterization and to vary the thermal properties of nanowires. The review concludes with a brief perspective on future research directions, from phonon-induced control over properties to three-dimensional (3D) acoustic nano-imaging.
Highlights
Nanowires are nanoscale materials that display confinement in two dimensions
Properties related to phonons, such as thermal conductivity, have peculiar behavior compared to bulk
We investigate the changes in phonon behavior in nanowire compared to bulk materials in light of the dispersion relations and displacement fields calculated with the xyz algorithm
Summary
Nanowires are nanoscale materials that display confinement in two dimensions. For photons, electrons and phonons, this confinement leads to modified behavior compared to the bulk counterpart and has triggered much interest in the development of novel applications in various fields [1], such as photovoltaics [2, 3], electronics. Properties related to phonons, such as thermal conductivity, have peculiar behavior compared to bulk. Optical imaging in opaque materials can only give information on the surface, and the large wavelength of visible light limits the achievable resolution. With these techniques, the source of contrast is related to the electronic structure of the materials and does not grant access to other. The use of nanowires as transducers has been proposed to enable small acoustic sources [23] For this purpose, and to understand thermal transport, a deeper understanding of phonons propagation in nanowires is required.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
