'Nanophotonics to enhance fluorescence energy..'


Jerome Wenger (Aix-Marseille University) 
'Nanophotonics to enhance fluorescence energy transfer between individual molecules'

Abstract: Energy transfer between molecules is an essential phenomenon for photosynthesis, photovoltaics, and biotechnology. Thanks to their ability to control and manipulate optical fields down to the nanometre scale, it is appealing to use nanophotonic plasmonic structures to control and further enhance the energy transfer between single quantum emitters. In this contribution, I will briefly review the state-of-the-art in the field of using optical nanostructures to control the near-field energy transfer. Especially the conditions leading to some visible effects and those not will be discussed based on the recent literature and I will also discuss the current limits in the optical detection.

Kaizad Rustomji (Aix-Marseille University) 
'Microwave antenna impedance models for dipole-dipole interaction mediated processes'

Abstract: Several processes in atom-field interaction physics are mediated through dipole-dipole interactions (DDI). It is a topic of great interest in how modifying the electromagnetic environment influences these processes. A key example is Förster resonance energy transfer (FRET) where energy is transferred nonradiatively from a donor to an acceptor molecule. While it is an important process in physics, biology, and engineering alike, its precision experiments notoriously challenging. As FRET exhibits extreme sensitivity to the relative positioning of the donor-acceptor molecules which must be precisely controlled at nanometer distances. In the past decade techniques have been developed to study aspects of atom-field interaction physics at microwaves with antennas. Notably, the rate of change spontaneous emission due to the environment, that is, the Purcell factor is known to be analogous to the impedance of a short dipole antenna. When compared to optical wavelengths, longer microwave wavelengths offer better control over emitter position its dipole orientation. More recently we expanded the microwave antenna impedance methods to the study of DDI. We applied this method to measure experimentally FRET like nonradiative energy transfer inside a microwave cavity with unprecedented spatial resolution.