The ability to design metamaterials with the prescribed properties is a key to their numerous applications and a focus of intense studies in the photonics community. As metamaterials are engineered at a scale which is much smaller than the wavelength of light, it is possible to treat them as a homogeneous medium with the effective values of permittivity and permeability. Nevertheless, there is no common approach to extract these effective parameters despite the significant efforts of the research community over the last years.
In a recent paper published in Phys Rev B, we propose a novel approach to extract the homogenized parameters by analyzing the reflection and transmission spectra. We show that this generalization preserves the physical meaning of the effective parameters at high frequencies and in the vicinity of resonances, where the nonlocal contributions cannot be neglected. It is also shown the decomposition of scattering spectra into even and odd modes helps to separate various contributions and to derive the explicit formulas for the effective permittivity and permeability which always satisfy the passivity and causality constraints.
There is currently one opening position for an Attaché Temporaire d'Enseignement et de Recherche ATER (one-year non-renewable assistant professor contract) associated to Aix Marseille University. The research program will be done in one the groups at the Fresnel Institute under the supervision of a statutory researcher.
Deadline for application April 30th
Contract start September 1st
See the application procedure: http://drh.univ-amu.fr/public_content/recrutement-ater-2014-2015-modalites-liste-postes-section
See our new preprint released on ArXiv 1403.2222: Nanophotonic enhancement of the Förster resonance energy transfer rate on single DNA molecules
Nanophotonics achieves accurate control over the luminescence properties of a single quantum emitter by tailoring the light-matter interaction at the nanoscale and modifying the local density of optical states (LDOS). This paradigm could also benefit to Förster resonance energy transfer (FRET) by enhancing the near-field electromagnetic interaction between two fluorescent emitters. Despite the wide applications of FRET in nanosciences, using nanophotonics to enhance FRET remains a debated and complex challenge. Here, we demonstrate enhanced energy transfer within single donor-acceptor fluorophore pairs confined in gold nanoapertures. Experiments monitoring both the donor and the acceptor emission photodynamics at the single molecule level clearly establish a linear dependence of the FRET rate on the LDOS in nanoapertures. These findings are applied to enhance the FRET rate in nanoapertures up to six times, demonstrating that nanophotonics can be used to intensify the near-field energy transfer and improve the biophotonic applications of FRET.
Jerome will attend SPIE Photonics Europe 2014 conference in Brussels on April 14-17. He will present four contributions from the group:
- Paper 9126-57 Plasmonic nanoantennas for enhanced single molecule analysis at high concentrations (invited paper)
- Paper 9126-62 Enhanced fluorescence emission from resonant DNA assembled plasmonic nanoantennas loaded with single dye molecules
- Paper 9129-91 Hollow core photonic crystal fiber probes for Raman and fluorescence spectroscopy with photonic nanojet focusing
- Paper 9125-62 Homogenization of metamaterials through the singular analysis of scattering spectra