Articles récents

Fresnel diffraction experiment 1/7: official trailer

24 Janvier 2020 , Rédigé par JW

Is there light in the center of a shadow from a black disk? What is the shadow of a hole milled in an opaque screen? Can adding light to light create darkness?

The Institut Fresnel releases a series of short videos answering various questions about light and optics, providing an illustration of physical optics concepts such as diffraction, interferences, imaging and microscopy.

See our official trailer below (sounds very pro like that). More videos on the Institut Fresnel youtube channel.

Bicentenary of Fresnel wave diffraction theory

6 Janvier 2020 , Rédigé par JW

Institut Fresnel is organizing a special day to celebrate this anniversary: https://www.fresnel.fr/bicentenaire-fresnel/

 

Nanophotonics and Micro/Nano Optics International Conference 2020

16 Décembre 2019 , Rédigé par JW

Chaired by Patrice Genevet and co-chaired by Jerome Wenger, the Nanophotonics and Micro/Nano Optics International Conference 2020 is proudly featuring an outstanding list of 12 outstanding invited speakers. The conference attendance is limited to 250 persons, so check the NANOP 2020 conference website and apply enough in advance to secure your participation.

 

Deep UV plasmonic enhancement of single protein autofluorescence in zero-mode waveguides

4 Novembre 2019 , Rédigé par JW

Detecting proteins in the UV range is appealing to take advantage of their natural tryptophan fluorescence and rule out all the issues related with external fluorescence labelling. However, proteins feature a much lower fluorescence brightness than conventional fluorescent dyes. This is where nanophotonics can improve the detection sensitivity.

In a recent Nano Letter article, we report the first demonstration of single protein UV fluorescence enhancement using aluminum zero-mode waveguides nanoapertures. Dedicated strategies were developed to overcome the technical challenges of working in the UV range. This involves optimizing the UV aluminum nanostructures fabrication, counteracting the metal photocorrosion, dealing with the limited photostability of proteins and developing robust analysis tools to extract useful information out of noisy traces.

This unprecedented detection of single protein fluorescence with UV plasmonics paves the way for interrogating individual proteins in their native state and at physiological concentrations.

Also freely available on ArXiv 1909.08227

 

Preventing Aluminum Photocorrosion for Ultraviolet Plasmonics

14 Octobre 2019 , Rédigé par JW

Ultraviolet plasmonics is a burgeoning scientific field where the strong molecular absorption bands in the UV range are combined with the intense electromagnetic fields of plasmonic nanostructures. This powerful combination is highly promising to promote surface-enhanced spectroscopy and catalysis. However, in a recent J Phys Chem Lett article, we find that the photocorrosion of aluminum can severely hamper UV plasmonics applications but appropriate protection solutions can circumvent this issue.

Significance:

- We highlight the occurrence of the aluminum photocorrosion effect and explain its origin by the nonlinear absorption of water in the UV leading to the production of hydroxyl radicals.

- Different protection strategies are developed to prevent the photocorrosion based on scavengers for reactive oxygen species and additional polymer layers, achieving a 10-fold increase in the UV power range with no visible corrosion effect.

Also freely available on ArXiv 1907.11003

 

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