Postdoctoral Researcher in Nano-Optics and Plasmonics
il y a 2 semaines
Research Project:
The Q-META project aims to control and improve the emission properties of quantum emitters with 2D optical metasurfaces, far beyond the performance offered by state-of-the-art single nanoantennas. To achieve this, non-classical light sources will be precisely positioned in the near-field of 2D dielectric metasurfaces (métasurfaces). These will be specifically designed to control the directivity, brightness, chirality, and polarization of QE emission by coupling to localized and collective resonances, in the visible/near-infrared.
Research Activities:
In this project, quantum emitters will be colored centers in colloidal nanodiamonds, with diameters typically in the range of a few tens of nanometers. NV centers will be used in priority, but other available colored centers at CEMES will also be considered (collaboration with an academic partner).
- Metasurfaces will be designed and fabricated by ebeam lithography on silicon-on-insulator (SOI) substrates, thanks to an active collaboration with the LAAS laboratory in Toulouse (the candidate will not be directly involved in these steps).
- The spatial and quantitative positioning of fluorescent emitters in the 2D periodic structure of metasurfaces will be achieved by a directed assembly technique called nanoxerography AFM. This technique, at the heart of the present postdoctoral project, has been developed in the Nanotech team of LPCNO. It relies on the local injection of electrostatically charged points by a polarized tip positioned above the areas of interest. These charged points will act as selective electrostatic traps for the emitters. The two laboratories (CEMES-LPCNO) involved in this project have recently demonstrated the deterministic and reproducible positioning of nanodiamonds on a flat SiO2/Si film and on simple Si nanoantennas.
- Once hybrid emitter-metasurface systems are realized, the candidate will characterize the modification of the photodynamics of emitters as a function of wavelength and dipole orientation by 2D mapping of resolved-time photoluminescence. The control of directivity and polarization will be evaluated by Fourier imaging resolved in polarization. These optical characterizations will be performed at CEMES on high-resolution confocal microscopes. Experimental results will be systematically supported by numerical simulations (GDM).
Requirements:
The candidate will hold a PhD in nano-optics, plasmonics, nanotechnologies, or near-field probe techniques with a solid background in general physics, electromagnetism, and light-matter interaction. They will have solid research experience and a prior experience in optical microscopy and/or AFM. Autonomy, dynamism, scientific curiosity, and rigor are the key words to successfully carry out this project.
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