Mr. Jean-Baptiste Decombe Profile

Jean-Baptiste Decombe

at Louisiana State Univ

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Publications (4)

Proceedings Article | 26 July 2016 Presentation

Rare earth-doped nanorods spectroscopy through dual fiber nanotip optical tweezers and conventional confocal microscopy (Conference Presentation)

Godefroy Leménager, Jean-Baptiste Decombe, Maud Thiriet, Khalid Lahlil, Jochen Fick, Thierry Gacoin

Proc. SPIE. 9884, Nanophotonics VI

KEYWORDS: Confocal microscopy, Microscopes, Polarization, Nanoparticles, Spectroscopy, Particles, Luminescence, Optical tweezers, Atmospheric particles, Nanorods

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The unique optical properties of fluorophores nanoparticles doped with rare earth elements have attracted a lot of attention in the scientific community due to their potential application from biological imaging to quantum information. In this work, we compare the photoluminescence of nanoparticles measured by two different means: traditional objective based microscopy and fiber based optical tweezers. Our doped NaYF4 nanocrystals are prepared through solvothermal synthesis. Ytterbium and erbium codoping provides nanoparticles with luminescence properties. Under IR laser excitation, the nanoparticles present strong and photostable upconversion signals in the visible range. In addition, by changing the gadolinium content of the host matrix, we obtain nanorods with a controlled aspect ratio up to 20 and a well defined crystalline structure. The high anisotropy of the nanoparticles results in a strong polarisation of the photoluminescence. To investigate this property, we observed our nanoparticles using a confocal microscope and studied the dependency of the polarisation with the length of the particles. To complete our characterization, we used optical tweezers to trap nanoparticles in water. We first show the possibility to trap these nanoparticles with an original optical tweezers based on two chemically etched fibers. Due to the optical forces applied by the laser beam coupled into the fibers, the nanorods align themselves between the two fibers along their long axis. Afterwards, the fibers are not only used to trap the particles but also to collect the luminescence emitted only by the trapped nanoparticles. By this mean, we can analyse the emitted light with a spatial resolution. This result will be compare to previous observation done on the same particles with our confocal microscope. Moreover, an orthogonal third fiber was implemented in the set up. This fiber can move along the particle and collect the light emitted at different point. We present the link between the photoluminescence properties and the emission point by moving this last fiber. In addition, our optical tweezers are associated to a traditional objective-based optical microscope. We compared the photoluminescence emitted by particles in a homogeneous medium (water) or at an interface when drop casted on a coverslip.

Proceedings Article | 21 April 2016 Paper

Plasmonic coupling between metallized fiber tips with sub-wavelength open apertures

Jean-Baptiste Decombe, Francisco Valdivia-Valero, Gérard Colas des Francs, Jochen Fick

Proc. SPIE. 9884, Nanophotonics VI

KEYWORDS: Optical fibers, Apertures, Optical components, Plasmonics, Surface plasmons, Polarization, Metals, Optical tweezers, Image transmission, Transmittance, Electroluminescent displays, Nano optics, Near field optics

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Proceedings Article | 17 September 2014 Paper

Micro- and nano-particle trapping using fibered optical nano-tweezers

Jean-Baptiste Decombe, Géraldine Dantelle, Thierry Gacoin, Francisco Valdivia-Valero, Gérard Colas des Francs, Serge Huant, Jochen Fick

Proc. SPIE. 9164, Optical Trapping and Optical Micromanipulation XI

KEYWORDS: Silica, Scattering, Nanoparticles, Annealing, Particles, Laser scattering, Numerical simulations, Optical tweezers, YAG lasers, Electroluminescent displays

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Proceedings Article | 2 May 2014 Paper

Optical trapping of microparticles using bare fiber nano-tips

Jean-Baptiste Decombe, Serge Huant, Jochen Fick

Proc. SPIE. 9126, Nanophotonics V

KEYWORDS: Beam splitters, Optical spheres, Video, Particles, Dielectrics, Image resolution, Optical testing, Optical tweezers, CMOS cameras, Chemical analysis

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