Francesca Mangiarini and Laura-Isabelle Dion-Bertrand will present new results obtained with hyperspectral imaging in the field of biology and material science at the next SPIE Photonic West conference. Find bellow the abstract and time of their talks.


 

NEW CONFOCAL MICROSCOPY HYPERSPECTRAL IMAGER FOR NIR-EMITTING BIOPROBES: HIGH SPECTRAL RESOLUTION FOR A WIDE SPECTRAL RANGE

Stéphane Marcet1, Antonio Benayas2, Marta Quintanilla2, Francesca Mangiarini1, Marc Verhaegen1, Fiorenzo Vetrone2, Sébastien Blais-Ouellette1

1. Photon etc. Inc., Montréal, Canada

2.  Institut National de la Recherche Scientifique (Canada)

Aiming for more accurate, efficient, non-invasive and fast diagnostic tools, the use of NIR light in the 1st and 2nd biological window provides deeper penetration depth into biological tissue, better image contrast, reduced phototoxicity and photobleaching. NIR-based bioimaging became an emerging field. Since commercially available microscopes are not optimized for NIR-emitting bioprobes, a new microscopy hyperspectral confocal imager was developed to cover a broad spectral range (400-1700 nm) with high spectral resolution (0.2 nm), and tunable illumination (690-1040 nm). Here we present the preliminary results of the spatial distribution of the fluorescence from lanthanide-doped nanoparticles incorporated into a biological system.

The conference is at 2:40 pm on Februrary 17th and will be held in the ''Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications XIII'' session of SPIE BiOS.

You can find more details on the session here.


LARGE SCALE GROWTH OF GRAPHENE BY CHEMICAL VAPOR DEPOSITION (CVD) AND ELECTROSTATIC DEPOSITION CHARACTERIZED BY GLOBAL HYPERSPECTRAL RAMAN IMAGING

Laura-Isabelle Dion-Bertrand1, Vincent Aymong2, Minh Nguyen2, Charles Trudeau3, Saman Choubak4, Pierre Lévesque2, Nicolas David1, Sylvain Cloutier3, Patrick Desjardins4, Richard Martel2

1 Photon etc. ltd, Montréal, Canada
2 Regroupement Québécois sur les Matériaux de Pointe and Département de Chimie, Université de Montréal, Canada
3 École de Technologie Supérieur, Département de Génie Électrique, Canada
4 Regroupement Québécois sur les Matériaux de Pointe and Département de Génie Physique, Polytechnique Montréal, Canada

The synthesis of large scale graphene is currently a subject of intense research. Chemical vapor deposition (CVD) and electrostatic deposition are under the scope of numerous research groups. CVD is the primary technique of graphene deposition. However, despite many efforts, CVD graphene in different growth conditions exhibits various morphologies such as the presence of hillocks, defects, grain boundaries and multilayers island formation. We conducted a systematic study on CVD grown graphene by methane on copper and performed global hyperspectral Raman imaging of the layers in order to obtain structural and chemical mapping of the various structures of our samples at high resolution. The results show commensurate bilayers formed in oxidative environment and mostly twisted bilayers in more reductive environment. The preparation of complete bilayer films will also be presented and analyzed using global Raman characterization. We then turn to electrostatic deposition of graphene. By improving the cleaving process we show that large scale graphene deposition (120 µm x 120 µm) is achievable using electrostatic forces. The results show that electrostatic graphene consisted mainly of single and double layered graphene with occasional multi-layered graphene. The intrinsic specificity of Raman scattering combined with the analysis performed by the global imaging modality allow to assess large maps (hundreds of microns) of the spatial distribution of defects, number of layers and stacking order. The Raman signatures of the different configurations of graphene known in the literature are used in this framework to map the influence of the growth conditions on sample morphology. 

The conference is at 11:10 am on February 15th and will be held in the ''Optical Components and Materials XIII'' session of SPIE OPTO.

You can find more details on the session here.