Institut des
NanoSciences de Paris
insp
Accueil > Evénements > Séminaires > Archives 2009 > Nanophononics : manipulat
insp
4.jpg

Séminaire général

Nanophononics : manipulating sound at the nanoscal

par Daniel Lanzillotti-Kimura

Through the development of semiconductor nanostructures displaying controlled acoustic impedance modulations, a new area is growing in nanoscience : nanophononics. This area is devoted to the study of the vibrational and thermal properties at the nanometer scale, and the interaction of these engineered phonons with photons and electrons at high frequencies and reduced scales.

In the first part of the talk I will discuss some recent results on the control of acoustic phonon dynamics using engineered nanostructures. Superlattices operate as high reflectance phononic mirrors, acoustic nanocavities confine and amplify the hypersound field both spatially and in the spectral domain, and optimized aperiodic multilayers may act as tailored phononic filters. Results of coherent phonon transmission experiments over these nanostructures will be discussed. In the second part of the talk, I will address the problem of the generation and detection of coherent acoustic phonons in structures that can confine light and hypersound.