Gigahertz Coherent Guided Acoustic Phonons in AlN/GaN Nanowire Superlattices

The generation of guided acoustic phonons in the GHz range in GaN/AlN superlattices grown atop a GaN nanowire is presented. Combined with a femtosecond laser, ultrafast pump–probe spectroscopy allows the generation and detection of guided acoustic phonons at different frequencies in the nanowire sup...

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Bibliographic Details
Published in:Nano letters 2013-03, Vol.13 (3), p.1139-1144
Main Authors: Mante, Pierre-Adrien, Wu, Yueh-Chun, Lin, Yuan-Ting, Ho, Cheng-Ying, Tu, Li-Wei, Sun, Chi-Kuang
Format: Article
Language:English
Subjects:
Acoustics
Aluminum nitride
Coherence
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Dispersions
Exact sciences and technology
Femtosecond
Gallium nitrides
General equipment and techniques
Instruments, apparatus, components and techniques common to several branches of physics and astronomy
Materials science
Nanocrystalline materials
Nanoscale materials and structures: fabrication and characterization
Nanoscale materials: clusters, nanoparticles, nanotubes, and nanocrystals
Nanowires
Phonons
Physics
Quantum wires
Sensors (chemical, optical, electrical, movement, gas, etc.)
remote sensing
Structure of solids and liquids
crystallography
Superlattices
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Summary:The generation of guided acoustic phonons in the GHz range in GaN/AlN superlattices grown atop a GaN nanowire is presented. Combined with a femtosecond laser, ultrafast pump–probe spectroscopy allows the generation and detection of guided acoustic phonons at different frequencies in the nanowire superlattices. The capability of the nanowire superlattices to be excellent detectors of acoustic phonons at specific frequencies is then used to observe the strong dispersion, as a result of nanoconfinement, of guided acoustic phonons after their propagation in the nanowire. The generation of high frequency coherent guided acoustic phonons could be useful not only to realize an acoustic transducer with a nanolateral size but also as a source to understand the thermal behavior of nanowires.
ISSN:1530-6984
1530-6992
DOI:10.1021/nl3044986