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Physics Colloquium - Prof Gerd Leuchs

Friday, 31 January 2020

Physics Department

Prof Gerd Leuchs

Max Planck Institute for the Science of Light, Erlangen

Institute for Applied Physics of the Russian Academy of Sciences, Nizhoy-Novgorod

University Erlangen-Nürnberg

"Coupling between light and a small sub wavelength matter particle"

The light field determines the type of excitation of the particle and the excitation of the particle determines emitted field. Controlled directional emission may occur because of boundary conditions such as the vicinity of an interface (see figure 1), or because of the interference of different multipoles, e.g. electric and magnetic dipole, as in the case of the Huygens waves. This has applications in high resolution localization of a small particle, and in a quantum network for directional routing of light between two particular atoms. In order to optimally couple the light to a particle in free space, such as a single two-level atom, one has to tailor the exciting field correspondingly and provide light from the whole solid angle. In our experiments we use a deep parabolic mirror to provide near full solid angle excitation (see figure 2). This interaction may be used to entangle two atoms using coherent states of light and to demonstrate that spontaneous emission is symmetric with respect to time reversal. In a third line of experiments we use the tight focus in the deep parabolic mirror to trap neutral quantum dots (dot-in-rod) and study their emission.

WHEN: Friday 31 January 2020
WHERE: Room 314, Science 3 Building
TIME: 12.00 pm–1.00 pm

All interested are welcome to attend

Light refreshments to follow in Common Room