FEMTOTERA (DFM.AD005.063)

Area tematica

Scienze fisiche e tecnologie della materia

Area progettuale

Struttura responsabile del progetto di ricerca

Istituto di fotonica e nanotecnologie (IFN)

Responsabile di progetto

CATERINA VOZZI
Telefono: 02/23996085
E-mail: caterina.vozzi@polimi.it

Abstract

FemtoTera addresses the fundamental technological field of ultrashort pulsed Terahertz (THz) radiation
generation for time domain spectroscopy. This is an ever growing field, due to the important properties
of such radiation and its significant applications. One of the more effective way to generate short THz
radiation pulses is via femtosecond near-infrared (NIR) laser irradiated on semiconductor/metal
surfaces. FemtoTera project targets the study of such THz generation process at surfaces by stimulating
with utrashort laser pulses a semiconductor surface nano-engineered with self-assembled quantum dots
(QDs) - metal nanoparticle (MNP) systems. The surface will be nanostructured via bottom-up processes,
using innovative fabrication methods developed by the consortium participants. The interaction effects
between ultrashort NIR laser pulses and the nanostructured will be investigated, in view of THz
generation, both theoretically and experimentally using the complementary expertise of the EU and
Japan groups.

Obiettivi

FemtoTera will develop an innovative ultrashort pulse Terahertz (THz) generation scheme, using nanostructured semiconductor/metal surfaces and ultrashort NIR laser pulses to efficiently generate THz radiation. Reliable THz pulses can be obtained by interaction of laser light with semiconductor and semiconductor/metal interfaces. However, the possibility to use, instead of bare semicondutor surfaces, quantum nanostructures would introduce a large flexibility, owing to quantum confinement effects, allowing for the manipulation of the emission over the region from several to hundreds of microns. The FemtoTera project will study plasmon-enhanced emission from intraband transition that takes place, when irradiated with femtosecond laser pulses, on surfaces functionalized with self-assembled QD molecules (QDMs) coupled to a MNPs. THz radiation emission, with a frequency corresponding to the QD molecule interlevel spacing is expected. Innovative fabrication schemes (Droplet Epitaxy - DE) based on advanced Molecular Beam Epitaxy procedures for the self assembly and self-alignment of QDM and MNP will be implemented by FemtoTera

Data inizio attività

01/10/2014

Parole chiave

Devices Design, manufacturing, advanced materials

Ultimo aggiornamento: 28/04/2025