Micro-brillouin study of the eigenvibrations of single isolated polymer nanospheres.
The localized acoustic modes of single isolated polymethyl methacrylate (PMMA) and polystyrene nanospheres have been studied by micro-Brillouin light scattering. The measured mode frequencies are analyzed on the basis of the Lamb theory formulated for a sphere under free boundary conditions. By measuring light scattering from single isolated particles, placed atop a piece of polished silicon wafer, the free-surface conditions are almost experimentally realized. The observed spectral peaks are attributed to localized eigenvibrations whose frequencies scale as inverse sphere diameter, in accordance with Lamb's theory. The Young's moduli and Poisson ratios of the polymer spheres studied have been evaluated from fits to the experimental data. We have demonstrated that micro-Brillouin spectroscopy is a powerful technique for probing the acoustic dynamics and mechanical properties of nanostructures.
Li
Yi
Y
Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542, Singapore.
Lim
Hock Siah
HS
Wang
Zhi Kui
ZK
Ng
Ser Choon
SC
Kuok
Meng Hau
MH
D000162:Acoustics; D003198:Computer Simulation; D003460:Crystallization / Q000379:methods; D008027:Light; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008956:Models, Chemical; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D036103:Nanotechnology / Q000379:methods*; D010316:Particle Size; D019904:Polymethyl Methacrylate / Q000737:chemistry*; D012031:Refractometry / Q000379:methods*; D012542:Scattering, Radiation; D013499:Surface Properties
D046911:Macromolecular Substances; D019904:Polymethyl Methacrylate