Generation and control of ultrashort-wavelength two-dimensional surface acoustic waves at nanoscale interfaces
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; Yang, Ronggui; Nelson, Keith Adam; ... Show more Show less
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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.
Date issued
2012-05Department
Massachusetts Institute of Technology. Department of ChemistryJournal
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
ISSN
1098-0121
1550-235X