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Dr. Dries Van Oosten

University of Utrecht, The Netherlands

Monday, May 6th, 2013 at 03:00:00 PM  

Conference room Querzoli - LENS - via Nello Carrara 1 - Sesto Fiorentino (Florence)

Published on-line at 09:19:25 AM on Wednesday, April 24th, 2013

Non-linear light matter interaction in nanophotonic structures

Two examples of electro-magnetic field enhancement in nanophotonic structures: optical traps and ultrafast laser ablation.

In nanophotonics, dielectric and metallic structures with length scales on the order of the wavelength of light, are used to control the flow of light. When light is confined in such structures, the electro-magnetic field can be strongly enhanced. This enhancement works both ways: light is more strongly influenced by matter and matter is more strongly influenced by light!

In my talk I will present two examples of this. In the first part of my talk, I will describe how the localized optical fields in a photonic crystal nanocavity could be used to create a novel kind of optical trap, in which a single atom can be trapped by only a fraction of a photon (10.1103/PhysRevA.84.011802).

In the second part of my talk, I will talk about ultrafast laser ablation, which is considered as a promising rapid prototyping technique for nanophotonic structures. When using single femtosecond laser pulses, material can be very gently ablated (10.1063/1.3666423), in a process referred to as cold-ablation. This means the geometry of the holes can be very well controlled. An interesting twist to the story is that ablation is not only an interesting candidate for fabrication of nanophotonic structures, one also need to use principle of nanophotonics to understand the ablation process.

For further informations, please contact Dr. Matteo Burresi.