Articles récents

3rd summer school on plasmonics SSOP3

5 Avril 2013 , Rédigé par JW Publié dans #Nanophotonics pick

Submissions and registrations for the 3rd Summer School On Plasmonics are now open. This summer school will bring together international specialists in Plasmonics on one of the most beautiful islands of the Mediterranean. Check out the exciting program and the list of invited speakers at http://www.fresnel.fr/ssop3/

11 courses and 2 tutorials will be presented by international specialists on the following topics:
-Light scattering by metallic particles
-Wood's anomalies
-Limits of diffraction
-Dielectric permittivity of metals
-Thermoplasmonics
-Nonlocal and quantum effects
-Bioplasmonics
-Non-linear plasmonics
-Electro-plasmonics
-Quantum Plasmonics and Magnetic Metafluids
-3D optical metamaterials and transformation optics
-Optical spectroscopy of metal nanoparticles
-Molecular plasmonics

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Invited talk at SPP6 conference Ottawa

28 Mars 2013 , Rédigé par JW Publié dans #Recent research work

Deep's abstract on Plasmonic nanoantennas for enhanced single molecule analysis at micromolar conentrations has just been promoted for invited talk presentation at the 6th International Conference on Surface Plasmon Photonics SPP6.

As a teaser, our main claims are:

  • fluorescence enhancement up to 1100-fold AND fluorescence brightness per molecule up to 400kHz (detected)
  • detection volume measured down to 58 zeptoliters, four orders of magnitude below the diffraction limit
  • true single molecule detection above 20 µM concentration actually measured
  • our dedicated design is fully compatible with detection of single fluorescent molecules in solution and fluorescence correlation spectroscopy

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Ultrahigh-sensitivity ultralow-noise optical fiber endoscope

22 Mars 2013 , Rédigé par JW

Optical fiber probes are generating a large interest to develop portable fluorescence spectrometers. However, the sensitivity of conventional fibers is severely limited by the high luminescence background generated in the glass and the low collection efficiency of fibers.

We solve this issue in a recent Optics Express publication by using a hollow core photonic crystal fiber probe combined with a polystyrene microsphere. Thanks to the hollow-core photonic crystal fiber, the background noise is reduced by two orders of magnitude. Thanks to the microsphere, the excitation beam is further focused and the fluorescence collection efficiency is improved.  As compared to the previous state-of-the-art, we report a 200x improvement of the signal-to-noise ratio for single molecules detection events, together with a 1000x gain on the minimum detectable concentration.

Our approach takes advantage of a polystyrene microsphere directly set at the fiber end-face to focus the fiber mode down to a spot of 540 nm FHWM. These results and their application for fluorescence imaging and direct laser writing have been reported in Applied Optics.

We believe that this device offers new opportunities for remote or in vivo optical characterization together with a miniaturization of bulky microscope setups. Applications include inspection of semiconductor wafers, photolithography, laser surgery, and fluorescence sensing.

 http://www.fresnel.fr/spip/spip.php?action=acceder_document&arg=1522&cle=6e687e1f61e7ee473a1b16ccebfbee45&file=jpg%2FkagoB10x2_-_web.jpghttp://www.fresnel.fr/spip/spip.php?action=acceder_document&arg=836&cle=98d399fef114849fb14c74b608352546&file=jpg%2FIMG_2699-2.jpg

Nano-Optics PACA Day

19 Mars 2013 , Rédigé par JW Publié dans #Nanophotonics pick

This one-day symposium will gather the main academic laboratories involved in nano-optics resarch in Provence Alpes Côte d'Azur. Registration is free but mandatory by email to merlen[AT]univ-tln.fr

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Optical Antennas Book Released

22 Janvier 2013 , Rédigé par JW Publié dans #Nanophotonics pick

Now available from Cambridge University Press, the Optical Antennas book edited by Mario Agio and Andrea Alu.

This consistent and systematic review of recent advances in optical antenna theory and practice brings together leading experts in the fields of electrical engineering, nano-optics and nano-photonics, physical chemistry and nanofabrication. Fundamental concepts and functionalities relevant to optical antennas are explained, together with key principles for optical antenna modelling, design and characterisation. Recognising the tremendous potential of this technology, practical applications are also outlined.

A free sample preview of the chapter I wrote on aperture antennas can be found here.

http://www.cambridge.org/jacket/9781107014145/size/xl