Articles récents

Photonics Spectra highlights the observation of nanojets

26 Août 2008 , Rédigé par JW Publié dans #Recent research work

See the paper by Lynn Savage in the July issue on the recent work of “Patrick Ferrand and colleagues at the Fresnel Institute” :

http://www.photonics.com/content/spectra/2008/July/microscopy/92560.aspx

OMNT article selection

15 Juillet 2008 , Rédigé par JW Publié dans #Nanophotonics pick

This trimester’s selection is pretty short (sorry, I’m in a rush to finish several research projects). I pointed out a contribution of Jordan Gerton’s team in Optics Express :

http://www.opticsinfobase.org/abstract.cfm?URI=oe-16-9-6183

The papers points out a nice theoretical and experimental study on the limits of single-molecule fluorescence detection within a dense ensemble, using tip-enhanced near-field microscopy. Specifically, the minimum magnitude of tip-induced signal enhancement is discussed and compared to the capabilities of commercially available silicon tips. Last, the authors show that modulation of fluorescence signals induced by an oscillating tip followed by demodulation with a lock-in amplifier increases image contrast by nearly two orders of magnitude.


French-Taiwanese symposium on Frontiers of Sciences

15 Juillet 2008 , Rédigé par JW Publié dans #Fancy lab

Back from the first French-Taiwanese symposium on Frontiers of Sciences, which was held in Taiwan from 25th to 29th of June this year. I’m very pleased to have attended this stimulating exchange. Taking some distance from the everyday’s lab work is always fruitful, specifically to think about the way of presenting the research work : what is the problematic, what is the goal ? I often forget about both questions, conferences help keeping connected with these issues.



Latest publication : Direct imaging of photonic nanojets

29 Mai 2008 , Rédigé par JW Publié dans #Recent research work

Published recently in Optics Express, it’s freely available at :
http://www.opticsinfobase.org/abstract.cfm?URI=oe-16-10-6930

We investigate the focusing of light by single latex microspheres illuminated by a collimated beam. Measurements are performed with a fast scanning confocal microscope in detection mode, where the detection pinhole defines a diffraction-limited observation volume that is scanned in three dimensions over the microsphere vicinity. From the collected stack of images, we reconstruct the full 3 dimensional photonic nanojet beam created by the microsphere.

Remarkably, we measure spot sizes as small as 270 nm FWHM for a wavelength of 520 nm. The beam keeps a subwavelength FWHM over a propagation distance of more than 3 micrometers, displaying all the specificities of a photonic nanojet. 

Click on the video below to visualize the photonic nanojet :

 


 

Academic Pride

13 Mai 2008 , Rédigé par JW Publié dans #Fancy lab





Very interesting : this skinny forearm bears strong ressemblance to mine...