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Lecture Francesco Banfi

Roster

WhenWhere
04 December 2008 FWN-Building 5116.0116, Nijenborgh 4, 9747 AG, Groningen
Speaker: Dr. Francesco Banfi
Affiliation: Università Cattolica, Brescia, Dipartemento di Matematica e Fisica
Title: Thermo-mechanics of a phononic crystal investigated by pump-probe optical techniques
Date: Thu Dec 4, 2008
Start: 11.00
Location: FWN-Building 5116.0116
Host: Paul van Loosdrecht
Telephone: +31 50 363 8149

Abstract

The ultrafast thermal and mechanical dynamics of a two-dimensional lattice of metallic nanodisks has been studied by near-infrared pump-probe diffraction measurements over a temporal range spanning from 100 fs to several nanoseconds. It is shown how the impulsive heating of the nanodisks lunches a Surface Acoustic Wave (SAW) in the Si substrate and how the SAW frequency, in the GHz range, can be can be tailored changing the lattice periodicity. The evolution of the SAW is studied in details from its birth to its dissipation to the bulk. A possible application of the present experimental technique to the field of nanocalorimetry is shown.


 

Last modified:22 October 2012 2.31 p.m.