F. R. Lamberti, M. Esmann, A. Lemaître, C. Gomez Carbonell, O. Krebs, I. Favero, B. Jusserand, P. Senellart, L. Lanco, and N. D. Lanzillotti-Kimura

Appl. Phys. Lett. 111, 173107 (2017)– Published 27 October 2017

In this work, by adiabatically breaking the periodicity in a single superlattice a novel approach to confine nanomechanical modes is introduced. By means of Raman spectroscopy, confined acoustic modes at ultra high frequencies around 350GHz are experimentally demonstrated.