Title :
Ultrafast dynamics of the interlayer shearing mode in Au graphite nanostructures
Author :
Avila-Ortega, M.F. ; Katayama, Ikufumi ; Minami, Yasuo ; Takeda, Jun ; Kitajima, Masahiro
Author_Institution :
Dept. of Phys., Yokohama Nat. Univ., Yokohama, Japan
fDate :
June 30 2013-July 4 2013
Abstract :
The main objective of this research is to study the effect on gold nanostructures (~10 nm diameter size) deposited in highly ordered pyrolytic graphite (HOPG), by measuring coherent phonon spectroscopy with ultrashort (7.5 fs) laser pulses. The gold average thickness d was varied from 2 to 40 Å. We focused on the influence of gold nanoparticles in the interlayer shearing mode E2g, whose energy is about 1.3 THz. We found a destructive interference of the phonon oscillations to decrease the intensity spectral peak which was critical for d=1.8 nm.
Keywords :
gold; graphite; nanoparticles; nanophotonics; phonon spectra; time resolved spectra; Au; C; HOPG; coherent phonon spectroscopy; destructive interference; gold average thickness; gold nanostructures; highly ordered pyrolytic graphite; intensity spectral peak; interlayer shearing mode; phonon oscillations; size 2 A to 40 A; ultrafast dynamics; Gold; Graphite; Nanoparticles; Oscillators; Phonons; Reflectivity; Shearing;
Conference_Titel :
Lasers and Electro-Optics Pacific Rim (CLEO-PR), 2013 Conference on
Conference_Location :
Kyoto
DOI :
10.1109/CLEOPR.2013.6600515
