Session Overview |
Photonics materials - Bloc 1Room: International 2 |
Date: Wednesday, June 06 |
08:30 |
Study of physical properties of new antimony glasses
Main Author: Rochdi El Abdi Organization: Université de Rennes, France Antimony sesquioxide glasses based on Sb2O3 with large atomic weight cations have attracted an increasing interest for their potential use in board band optical amplifiers operating around 1.5 micrometers. While most studies have been focused on tellurite glasses, glasses based on antimony oxide may have similar physical characteristics, without the specific problems related to tellurium toxicity. On the other hand, antimony glasses free of classic vitrifiers appear attractive for their extended infrared transmission ranges, their large refractive index (> 2) and their non-linear optical properties. The chlorides of the metal halide may be incorporated into the glasses of heavy oxides to obtain a very large subfamily. This work is centred upon new chloro-antimonite glasses associating antimony oxide and lead and silver halides. |
08:45 |
Synthesis of Reproducible Plasmonic AuAg Alloy Porous Nanoparticles
Main Author: Lu Wang Organization: École Polytechnique de Montréal, Canada Porous plasmonic nanoparticles, due to their combined plasmonic and structural properties, offer versatility for various applications in biomedical, environment and energy fields. We propose a facile method to synthesize porous AuAg nanoparticles with precise control in size, composition and porous structure, resulting in determined plasmon resonance peak and local field enhancement. The porous nanoparticles are obtained from colloidal AuAg alloy nanoparticles with dealloying approach, through galvanic replacement reaction (GRR) followed by silver etching. We tuned the morphology and thus plasmonic behavior of porous nanoparticles with elaborate regulation of both precursor and dealloying process. Monodispersed precursor and precise control of dealloying parameters result in porous nanoparticles with narrow-distribution, which is a prerequisite for applications in molecular sensing and detection and theranostic monitoring. |
09:00 |
Photovoltaic Graphene-bR Films for Photocells and Light-Harvesting Microsystems
Main Author: George Knopf Organization: The University of Western Ontario, Canada Photovoltaic responses of bacteriorhodopsin (bR) thin films are enhanced by doping the membrane solution with graphene (G) nano-sheets. The hybrid G-bR solution is deposited on conductive ITO coated glass and covered by a second electrode forming a photocell. The G nano-sheets act as a signal carrier between the bR purple membranes enabling charge accumulation on the ITO electrode. Experiments show a photovoltaic response of ~0.1mV for a white light source. A ~2.5% increase in the G-bR film resistance and reproducible 2nm shift in peak optical response were also observed. |
09:15 |
Optically Transparent Electrodes Based on Graphene Silver-Nanoprism Suspensions
Main Author: George Knopf Organization: The University of Western Ontario, Canada Optically transparent electrodes (OTEs) are often fabricated using expensive indium tin oxide (ITO) films because of its high conductivity and optical transparency (50Ω/sq @ 80% transparency). An inkjet printable graphene-silver nanoprism (G-AgNP) composite ink is introduced as an alternative for low-cost OTE applications. The aqueous graphene-carboxymethyl cellulose (G-CMC) ink is first synthesized and then mixed with a small quantity of AgNPs to enhance electrical conductivity without diminishing optical transparency. |
09:30 |
Solution processed SnOx nanoparticles for interfacial modification in blue phosphorescent organic light emitting diodes
Main Author: Ayse Turak Organization: McMaster University, Canada SnOx nanoparticles were produced by reverse micelle deposition to tune the interfacial properties of blue phosphorescent organic light-emitting diodes (PHOLEDs). Deposition at the ITO surface allowed improved charge balance with p- and n-type mixed host materials in emissive layer. The devices’ luminance and maximum external quantum efficiency (EQE) increased ~20 and 36% respectively. Tuning the charge injection properties using solution deposited nanoparticles allows rapid optimization of device efficiency. |
09:45 |
Silicon-based Nanostructured Thin Films for Photonic Applications
Main Author: Peter Mascher Organization: McMaster University, Canada In order for Si-based materials to be used in solid-state lighting (SSL) and silicon photonics schemes it is necessary to have precise control of the optical emission from these materials. After a brief review of the latest developments in the field, this talk will focus on the luminescence of undoped and rare earth (Ce, Tb, Eu) doped silicon oxides, nitrides, and carbides. Silicon carbonitrides (SiCxNy) in particular, have attracted interest for the manufacturing of materials with robust mechanical properties and promising optical features. |
10:10 |
Origin of optical nonlinearity of photo-responsive liquid crystals revealed by transient grating imaging
Main Author: Kenji Katayama Organization: Chuo University, Japan A colossal optical nonlinearity has been observed for the dye-doped liquid crystals under the condition that the nematic phase is very close to the isotropic condition, and it has been usually explained by the effect of the dye-induced torque on the liquid crystal. The photo-response of the liquid crystals was directly observed by the time-resolved transient grating phase imaging. A nonlinear increase of the refractive index was imaged, where a sharp peak of refractive index change was observed in the liquid crystal region. Furthermore, a shock-like wave was observed after this nonlinear response ended. We propose that a compression wave generated at the disordered/ordered interface induced the reorientation of liquid crystal molecules to generate a larger polarization, causing the optical nonlinearity. |