Lifetime of THz Acoustic Nanocavity Modes

ROZAS G, WINTER MFP, JUSSERAND B, FAINSTEIN A, PERRIN B, SEMENOVA E, LEMAITRE A

PHYSICAL REVIEW LETTERS

AMER PHYSICAL SOC

Año: 2009 vol. 102 p. 15502 - 15502

0031-9007

We present an ultrahigh resolution Raman study of the lifetime of 1 THz acoustic phonons confined in nanocavities. We demonstrate that the cavity Q factor can be controlled by design. Anharmonicity contributes only marginally to limit the cavity phonon lifetime, even at room temperature, while thickness fluctuations in the scale of 1/10 of a unit cell are the main limitation for the performance of THz phonon cavities.