Aluminum plasmonics for UV nanooptics
NANOMETROLOGY 2016, 01 June, Paris, France (Talk invité)
An electromagnetic field is able to produce a collective oscillation of free electrons at a metal surface. This allows light to be concentrated in volumes smaller than its wavelength. The resulting waves, called surface plasmons can be applied in various technological applications such as ultra-sensitive sensing, Surface Enhanced Raman Spectroscopy (SERS), or metal-enhanced fluorescence, to only name a few. For several decades plasmonics has been almost exclusively studied in the visible region by using nanoparticles made of gold or silver as these noble metals support LSPR only in the visible and near-IR range. Nevertheless, emerging applications will require the extension of nano-plasmonics toward higher energies, in the UV range. Aluminum is one of the most appealing metal for pushing plasmonics up to ultraviolet energies. The subsequent applications in the field of nanooptics are various. This metal is therefore a highly promising material for commercial applications in the field of nanooptics from the infrared to ultraviolet. As a consequence, aluminum (or UV) plasmonics has emerged quite recently. Aluminium plasmonics has been demonstrated efficient for numerous potential applications including non-linear optics, enhanced fluorescence, UV-SERS, optoelectronics (plasmonic assisted lasing, by coupling Al with wide bandgpap semiconduc-tors such as GaN), photocatalysis, structural colors and data storage. In this talk, we will discuss about the recent advances in aluminum plasmonics. Different preparation methods developed in the laboratory to obtain aluminum nanostructures will be presented with their optical and morphological characterizations. Both advantages and issue of aluminum as a plas-monic material will be part of the presentation.