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Potential-dependent Second-Harmonic Generation in Optical Antennas measured Time-resolved

Total Cost €


EC-Contrib. €






 PoSHGOAT project word cloud

Explore the words cloud of the PoSHGOAT project. It provides you a very rough idea of what is the project "PoSHGOAT" about.

second    gather    density    competitive    nanoparticle    receive    until    photons    introduce    electron    switching    nanoantennas    wavelength    poshgoat    optical    harmonic    energy    background    fine    evolutionary    geometries    oa    charge    breaking    ultrafast    modulation    subsequent    resonances    contacted    pump    spectroscopy    plasmons    nonlinear    conventional    generation    charges    external    electrons    molecule    optimize    symmetry    nm    optimization    routing    asymmetric    integration    ga    infrared    surface    sup3    nanoscale    free    voltage    optics    time    numerical    gap    coupled    tunnelling    size    novelties    resonators    tips    procedure    plasmonic    resonance    efficiency    antennas    regime    antenna    emitting    effect    sensitive    light    efficient    volumes    ion    waves    singe    metallic    maximize    efforts    sized    gaps    exhibit    fabrication    shg    nanoparticles    ultra    electrically    silicon    electronics    milling    concentrating    rules    resolved    narrow    he    missing    oas    nanometer    probe   

Project "PoSHGOAT" data sheet

The following table provides information about the project.


Organization address
city: MILANO
postcode: 20133

contact info
title: n.a.
name: n.a.
surname: n.a.
function: n.a.
email: n.a.
telephone: n.a.
fax: n.a.

 Coordinator Country Italy [IT]
 Total cost 137˙604 €
 EC max contribution 137˙604 € (100%)
 Programme 1. H2020-EU.1.3.2. (Nurturing excellence by means of cross-border and cross-sector mobility)
 Code Call H2020-MSCA-IF-2018
 Funding Scheme MSCA-IF-EF-ST
 Starting year 2020
 Duration (year-month-day) from 2020-05-01   to  2021-10-31


Take a look of project's partnership.

# participants  country  role  EC contrib. [€] 
1    POLITECNICO DI MILANO IT (MILANO) coordinator 137˙604.00


 Project objective

Second-harmonic generation (SHG) is a nonlinear optical effect, with promising applications in background-free spectroscopy, ultrafast optical switching, and optical information processing. What is missing is the integration of these effects at the nanoscale, to be sensitive down to the singe molecule level and competitive in size with silicon electronics.

Metallic nanoparticles, called optical antennas (OAs), show resonances in the infrared and optical wavelength regime. They exhibit plasmons, coupled states of photons and electron density waves, which allow concentrating light much better than conventional optics, down to 10 nm³. OAs enable SHG in nanometer-sized volumes, but until now only with low efficiency. This is due to the complex task of: (i) a resonance to receive light with wavelength A, (ii) routing the energy to the OA surface (efficient SHG due to symmetry breaking), (iii) exploiting a second antenna resonance which can gather the SHG at wavelength B=A/2, and finally (iv) emitting the wavelength B to the far field.

In the proposed project PoSHGOAT I will control and optimize SHG in OAs. To this aim, I will introduce four novelties to SHG research:

(1) Fabrication of electrically-contacted nanoantennas with ultra-fine tips (r = 3 nm) and ultra-narrow gaps (g = 3 nm) by a subsequent Ga-ion and He-ion milling procedure. (2) Modulation of the surface charges in metallic nanoparticles by applying an external potential. (3) Time-resolved pump-probe spectroscopy of SHG with an applied voltage, eventually even with induced tunnelling of electrons in a highly asymmetric antenna gap. This will establish ultrafast control over the OA surface charge density and, thus, SHG. (4) Numerical modelling of SHG and evolutionary optimization of nanoparticle geometries to maximize SHG in optical antennas.

All these efforts together will increase our understanding of nonlinear processes in plasmonic resonators, towards novel design rules for nonlinear plasmonic devices.

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The information about "POSHGOAT" are provided by the European Opendata Portal: CORDIS opendata.

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