Generation and control of ultrashort-wavelength two-dimensional surface acoustic waves at nanoscale interfaces
Name
Li-2012-Generation and control of ultrashort.pdf
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Author(s)
Li, Qing
Hoogeboom-Pot, Kathleen
Nardi, Damiano
Murname, Margaret M.
Kapteyn, Henry C.
Siemens, Mark E.
Anderson, Erik H.
Hellwig, Olav
Dobisz, Elizabeth
Gurney, Bruce
Date Issued
May 2012
Journal
Physical Review B
Publisher
American Physical Society
Citation
Li, Qing et al. “Generation and Control of Ultrashort-wavelength Two-dimensional Surface Acoustic Waves at Nanoscale Interfaces.” Physical Review B 85.19 (2012). ©2012 American Physical Society
Version
Final published version
Abstract
In this work, we generate and probe the shortest wavelength surface acoustic waves to date, at 45 nm, by diffracting coherent extreme ultraviolet beams from a suboptical phononic crystal. The short acoustic wavelengths correspond to penetration depths of approximately 10 nm. We also measure the acoustic dispersion in two-dimensional nanostructured phononic crystals down to this wavelength for the first time, showing that it is strongly influenced by the ultrashort acoustic penetration depth, and that advanced finite-element analysis is required to model the dispersion. Finally, we use pulse sequences to control surface acoustic wave generation in one-dimensional nanostructured gratings, to preferentially enhance higher-order surface waves, while suppressing lower frequency waves. This allows us to reduce the generated surface acoustic wavelength by a factor of two for a defined nanostructure period.
MIT Department
Massachusetts Institute of Technology. Department of Chemistry
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.85.195431
