(Archives) Niek van Hulst donnera un séminaire intitulé "Antennas for Light : Femtosecond Control on the Nanoscale" le jeudi 10 octobre à 14H00 en Amphi PONTE.

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(Archives) Niek van Hulst donnera un séminaire intitulé "Antennas for Light : Femtosecond Control on the Nanoscale" le jeudi 10 octobre à 14H00 en Amphi PONTE.

Niek van Hulst : ICFO – The Institute of Photonic Sciences, Castelldefels, Barcelona & ICREA – Institució Catalana de Recerca i Estudis Avançats, Barcelona.

Abstract :
Looking at the smallest scale, it is has become commonplace to detect single quantum emitters, such as dye molecules, quantum dots, diamond NV-centers and protein complexes, with applications in nano-imaging, sensing and quantum-optics. Now the challenge is to control their excitation and emission dynamics. In this presentation I will focus on the control of such interactions, both in space and time, by resonant optical nanoantennas and phase shaped fs pulses.
For spatial control, we coupling single photon emitters to optical nanorod antennas and direct the emission into dipolar and multipolar radiation patterns with full command of symmetry, multipole parity and polarization. Exploiting more complex array antennas the photon emission is steered into a narrow forward angular cone.
For temporal control, we exploit phase shaped fs pulses to drive resonant antennas and single quantum systems to dynamically control their fs response and nanoscale fields. Interestingly for single-molecules a superior degree of coherent control beyond the ensemble can be realized. When applied to single light-harvesting complexes we find surprisingly long coherent energy transfer times, even at room temperature.
In conclusion, with this presentation I hope to provide insight on the advances and potential of modern photonics at the cross-roads between nm and fs scales.

Reference :

- Brinks et al., Plasmonic Antennas as Design Elements for Coherent Ultrafast Nanophotonics, PNAS, in print (Oct 2013)
- Hildner et al.,Quantum coherent energy transfer in single light-harvesting complexes. Science 340, 1448-1451 (2013)
- Punj et al., Plasmonic ‘antenna-in-box’ platform for enhanced single-molecule analysis at micromolar concentrations, Nature Nanotechnol. 8, 512-516 (2013).
- Curto et al., Multipolar radiation of Q-emitters with nanowire optical antennas, Nature Commun. 4 : 1750 (2013).
- Novotny and Van Hulst, Antennas for Light. Nature Photon. 5, 83-90 (2011).
- Curto et al., Unidirectional Emission of Q-Dot Coupled to Nanoantenna. Science 329, 930-933 (2010).
- Brinks et al., Visualizing vibrational wavepackets of single molecules. Nature 465, 905-908 (2010).
- Taminiau et al., Optical Antennas direct Single-Molecule Emission. Nature Photonics, 2, 234 (2008)

Contact :
Niek.vanHulst chez ICFO.eu - www.ICFO.eu

Invitation : Nicolas BONOD - équipe CLARTE - Institut Fresnel (AMU - CNRS - ECM)