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ANTOMIC - Quantum nanoantennas for atomic-scale optical spectroscopy

ANTOMIC - Quantum nanoantennas for atomic-scale optical spectroscopy

Funding Program: 
EU - FP7
Coordinator: 
CIC nanoGUNE - Spain
Call: 
FP7-PEOPLE-2013-CIG
Project ID: 
618783
PI at nanoGUNE: 
Jose Ignacio Pascual (ji.pascual@nanogune.eu)
From: 
01/03/2014
To: 
28/02/2018
Total funding: 
100 000 €
Web: 
cordis.europa.eu/project/id/618783
Research: 
The ANTOMIC project (Quantum nanoantennas for atomic-scale optical spectroscopy) studies the quantum limits of light emission and scattering by metallic and molecular nanowires of nanometer sizes. We will identify their plasmon resonances and correlate them with their quantized electronic structure.

The interaction of light with structures much smaller than its wavelength, i.e. far below the diffraction limit, is enhanced by the effect that electromagnetic fields cause in the charge of the object. The excitation of plasmons enhances and focuses the light in the proximity of the nanostructure, mediating the energy exchange between photons and electrons. As the size of metal nanostructures and optoelectronic nanodevices approaches atomic-scale dimensions, quantization effects in their electronic and plasmon structure gain increasing relevance in light scattering. Understanding the coupling of photons with electrons in the presence of quantum effects is crucial for improving the functionality of optoelectronic nanodevices like light emitting diodes or for the performance of nanoparticles in fields like medicine, or catalysis.

The ANTOMIC project studies the quantum limits of light emission and scattering by metallic and molecular nanowires of nanometer sizes. We will identify their plasmon resonances and correlate them with their quantized electronic structure. The goal is to prove that nanowires of atomic sizes behave as optical antennas due to the quantization of their plasmon structure. This would mean that excitation of plasmon resonances can enhance the coupling between photons and electronic transitions in the nanowire.

Since this research project bridges the fields of atomic-scale spectroscopy and nanooptics, a novel experimental approach is proposed. We use low-temperature scanning-tunnelling and atomic-force microscopies, coupled to a light excitation and detection set-up, to resolve at the atomic scale both the electronic structure and light scattering/emission by the atomic-sized antennas in response to optical/electron excitations. To enhance the field focusing at the quantum object we use nanofabricated optical antennas as tips. An in-vacuum Fourier Transform detection scheme is being developed to extend the spectral detection to the mid-infrared.

Partners: 

CIC NanoGUNE - Spain (Coordinator)

nanoantenas
Scanning Tunnelling Microscope (STM)
atomic force microscope