Journal
JOURNAL OF APPLIED PHYSICS
Volume 104, Issue 10, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3021101
Keywords
bismuth; high-speed optical techniques; nanowires; phonons
Categories
Funding
- Robert A. Welch Foundation [A1546, A1562]
- NSF [DMR-0551813, DMR-0606529, MRI-0722800, DBI-0116835]
- Qatar National Research Fund [NPRP30-6-7-35]
Ask authors/readers for more resources
Coherent acoustic and optical phonon oscillations in Bi nanowire samples were studied with a femtosecond pump-probe technique. Laser pulses of 50 fs excited simultaneously acoustic oscillations at a frequency of about 9.5 GHz and optical phonons in the terahertz range. The transmission signal of nanowires on a glass substrate and the signal of light scattered from freestanding nanowires were measured. The acoustic velocity in nanowires was found to be close to that of bulk polycrystalline material. The changes in the optical phonon frequency at different laser fluences were simulated taking into account excitation inhomogeneity, lattice anharmonicity, diffusion, and recombination of the carriers and gave good agreement with experimental results.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available