Quantization of Acoustic Modes in Dumbbell Nanoparticles
Résumé
The vibrational eigenmodes of dumbbell-shaped polystyrene nanoparticles are recorded by Brillouin
light spectroscopy (BLS), and the full experimental spectra are calculated theoretically. Different from
spheres with a degeneracy of (2l + 1), with l being the angular momentum quantum number, the
eigenmodes of dumbbells are either singly or doubly degenerate owing to their axial symmetry. The BLS
spectrum reveals a new, low-frequency peak, which is attributed to the out-of-phase vibration of the two
lobes of the dumbbell. The quantization of acoustic modes in these molecule-shaped dumbbell particles
evolves from the primary colloidal spheres as the separation between the two lobes increases
Domaines
Sciences de l'ingénieur [physics]| Origine | Publication financée par une institution |
|---|
