Articles récents

FRET enhancement in aluminum nanoapertures

2 Avril 2015 , Rédigé par JW

FRET enhancement in aluminum nanoapertures

Metal nanoapertures known as zero-mode waveguides (ZMWs) are receiving a large interest as they concentrate light into nanoscale volumes and enable single molecule fluorescence experiments at micromolar concentrations. Within the large single molecule fluorescence toolbox, FRET is certainly one of the most widely used. Therefore it is tempting to associate ZMWs with FRET. However, such experiments are challenged by the complex influence the metal may have on the FRET process.

In a recent Chem Phys Chem article, we quantify the FRET rates and efficiencies between individual donor-acceptor pairs in aluminum zero-mode waveguides. We also compare the FRET results between ZMWs milled in gold and aluminum, and discuss the influence of plasmon resonance effects.

Given the large interest raised by aluminum ZMWs and FRET separately, we believe that our detailed report will help to expand the application of ZMWs as new devices for enhanced single molecule FRET at physiological concentrations.

Plasmonics and Metamaterials at CLEO Europe EQEC Munich 2015

9 Mars 2015 , Rédigé par JW

The technical program meeting for the CLEO Europe EQEC conference has just been held. For the EH Plasmonics and Metamaterials topic, we will have a total of seven sessions:
- Dielectric and hyperbolic metamaterials
- Chirality in plasmonics and metamaterials
- Plasmons in Low dimensionan materials
- Emission control with nanoantennas
- Nanoantennas: from sensing to thermoplasmonics
- Active plasmonics and metamaterials
- Coherent effects in nanophotonics
These sessions will provide an outstanding overview of current topics and future trends in metal nanophotonics from fundamentals towards applications and including all spectral regimes: plasmonic nanostructures, antennas, cavities and waveguides; metamaterials; hybrid materials; nonlinear structures and effects; active systems, systems with gain.

Plasmonics and Metamaterials at CLEO Europe EQEC Munich 2015

Rejection rate at CLEO Europe EQEC

9 Mars 2015 , Rédigé par JW

As we had a large number of submitted abstracts but a limited number of slots at the conference, the selection process was very fierce. About 50% of abstracts could be selected for talks, 25% for poster and unfortunately we had to reject about 25% of abstracts. This (relatively high) rejection rate is imposed by the CLEO/EQEC organization and does not necessarily reflect the will of the topical sub-committee (I would have liked to have more posters and less rejected papers). As the selection process is quite fierce, the abstract quality is a key factor. Here are a few hints to write better abstracts:
* state clearly your subject and the results you obtained
* explain how your work improves on the current knowledge or state-of-the-art
* if your abstract relates to a published article in a peer-reviewed journal, make it apparent.
* avoid parallel submission: do not multiply the abtracts on similar work

Optimizing Nanoparticle Designs for Ideal Absorption of Light

3 Mars 2015 , Rédigé par JW

Metallic nanoparticles and more recently dielectric nanoparticles are receiving tremendous attention due to their ability to concentrate light energy into volumes at the nanometer scale. Optimizing the absorption of light by suitably designed nanoparticles is of crucial importance for a wide range of applications including optical antennas, light harvesting, thermoplasmonics and local surface plasmon resonance sensing.

In an article recently published in ACS Photonics, we develop a new conceptual framework to achieve ideal absorption of light by metallic and dielectric particles. Our main results:
- We provide analytical formulations Eq.(16) describing the conditions to reach ideal absorption up to nanoparticle sizes of several hundreds of nanometer.
- Being analytical, these formulas are of immediate use for other researchers to optimize absorption in nanoparticles.
- The approach covers the important experimental case of core-shell nanoparticles which can satisfy the ideal light absorption condition over the full visible spectrum.
- We also address the problem of light absorption by dielectric and lossy particles, like silicon, that can exhibit both electric and magnetic Mie resonances.
- Our method enables the calculation of non-fundamental ideal absorption modes.

Optimizing Nanoparticle Designs for Ideal Absorption of Light

Deep Punj's thesis online

25 Février 2015 , Rédigé par JW

Optical antennas for single molecule fluorescence detection at physiological concentration

Free download at tel-01119033v1

Deep Punj's thesis online

Video NanoBioPhotonics Institut Fresnel

25 Janvier 2015 , Rédigé par JW

Watch our new video featuring the nanobiophotonics squad, best enjoyed with maximum resolution and high volume.

The video was realized by Olivier Caquelin Prod, see also his other videos on his youtube account. It was a great pleasure to deal with him.

The big update

23 Janvier 2015 , Rédigé par JW

With the transfer to the new kiwi platform, Overblog almost killed the blog. The transfer was a real mess and all articles in 2006-2012 period have been lost...

I seriously considered shutting down this site and going elsewhere, but at the end, I like the blog concept. It's about... being different.

I hope you'll enjoy the new version.

The big update

Deep is now Doctor Punj

22 Décembre 2014 , Rédigé par JW

Congratulations to Deep Punj for his successful PhD defence and his cum laude award!

Committee: Philip Tinnefeld (president), Sebastien Bidault (reviewer), Cyriaque Genet (reviewer), Sophie Brasselet (member), Herve Rigneault (co-supervisor), Jerome Wenger (supervisor)

DSC_0005---Copie-copie-1.JPG

Collaborators Maria Garcia Parajo and Romain Quidant video interviews

2 Décembre 2014 , Rédigé par JW

 

 

 

 

 

 

Where is Niek? I want Niek!

Raju Regmi as new PhD student

25 Novembre 2014 , Rédigé par JW Publié dans #Fancy lab

Raju Regmi (Nepal) is joining the group. He will do a PhD between Fresnel and ICFO on photonic nanoantennas to enhance the detection of fluorescent molecules.

http://www.fresnel.fr/spip/images/175x225/raju.regmi.jpg

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