Photonic West

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Photonic West, San Francisco, CA, United States, 13 – 18 February, 2016
Title: “Analysis of Photoacoustic Response from Plasmonic Nanostructures Irradiated by Ultrafast Laser in Water”
Abstract:  Gold and silver plasmonic nanoparticles (NPs) are widely used as a contrast agent for photoacoustic (PA) imaging, taking advantage of the strong optical absorption cross-section of these particles due to their localized surface-plasmon resonance. Inspired by recent developments in ultra-high frequency wide-bandwidth transducers, we propose utilizing off-resonance ultrashort laser sources with a pulse width in the femtosecond (fs) and picosecond (ps) range to increase the efficiency of PA imaging. Also, from the fact that the laser pulse duration is shorter than the heat diffusion time of the materials, we expect practically no collateral damage of the laser irradiated biological tissues. Our preliminary studies show that irradiating the NPs with an ultrashort-pulsed laser has the potential to achieve substantially higher efficiency at generating the PA signal. Enhanced by the presence of NPs, the laser field causes a highly localized plasma nucleation around the vicinity of the NPs. Plasma relaxes through electron-ion interaction and releases a pressure wave in the surrounding medium. However, in this process, it is crucial to precisely control the heat energy absorption in the NPs to avoid their fragmentation. In this talk we present a model to simulate an optimized plasma–mediated PA signal dynamics generated from off-resonance ultrashort laser excitation (λ =800 nm, τ = 70 fs – 2 ps) of a variety of plasmonic NPs with sizes ranging from 50 nm to 100 nm.

Mathematics Seminar

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Dept of Computer Science & Mathematics Seminar – Friday, Nov 14, 10:00am
Title: “Fundamentals of Plasmonics and Design of Metallic Nanostructures for Plasmon-Enhanced Applications”
Abstract: Light interaction with plasmonic (metallic) nanostructures opens up new and interesting physical phenomena on the nanoscale.  Recent experimental evidence suggests that these nanostructures can be utilized in a broad range of applications including solar energy harvesting, sensing, and biomedical applications; however, the development of theoretical models based on fundamental physics is absolutely necessary in order to guide the rapid development of these nanostructures for broader use.  In this introductory presentation I will speak about some of the current research projects in the area of plasmon-assisted nanophotonics being carried out in the newly established Computational Physics Lab in the Department of Computer Science and Mathematics at Nipissing.

Computer Science, Mathematics, and Physics Lectures

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Computer Science, Mathematics, and Physics Lectures (1:00 PM – Oct. 17, 2015 – Room A251)
Title: “Fundamentals and Design of Nanostructures for Nanomedecine Applications”
Abstract: In the past decades intensive research and development have been devoted to bring basic science, engineering, biology and medicine together to obtain innovative approaches and solutions to current health problems. Nanomedicine, the application of nanotechnology that deals with its applications to the medical world, is one of the most noteworthy examples of this convergence. This talk deals with the applications of optics to nanomedecine, mostly emphasising the physics and engineering developments.

Physics Day

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Physics Day (March 6th, 2015)
The Math and Computer Science department is pleased to announce that we have organized Physics Day that is scheduled for Friday, March 6th. Here is the attempt schedule for Physics Day.
9:30 – 9:45                Welcome to Nipissing
9:45 – 10:30              Research Presentation (Ali Hatef)
10:30 – 11:30            Class/Lab Activities
11:30 – 12:15            Lunch (Pizza)
12:15 – 1:15              Class/Lab Activities
1:15 – 2:15                Presentation (Carmen Wehrstedt)
2:15 – 2:30                Prizes and Good Bye!