Postdoctoral Fellow

I am pleased to welcome Dr. Mous Bahrami who joined us on September 2018 as Postdoctoral researcher. Dr. Bahrami obtained his B.Sc. in Physics from Isfahan University of Technology which is one of the prestigious and highest-ranking universities in Iran. He ranked 10th and 13th in photonics and optoelectronics M.Sc.  nationwide entrance exams respectively. He finished his M.Sc. in Laser and Plasma Research Institute (LAPARI) at Shahid Beheshti University, Iran.  There he investigated quantum optical properties of graphene and its nanoribbons with both theoretical and computational methods. Later, he jointed as a researcher to Theoretical Quantum Nano Photonics group at ICFO Spain where he worked on nonlinear optical properties of novel 2D materials. He joined the Department of Physics of Concordia University to peruse his Ph.D. in the field of condensed matter to investigate light-matter interaction. There he worked on many-body effects such as single- and two-body collisions, electron interaction by impurities, phonons on optical and transport of 2D and 1D novel structures via  developing quantum linear response theory.

New Paper in Advanced Therapeutics Journal

We had a chance to collaborate on a joint project titled, “Anti-EPCAM Gold Nanorods and Femtosecond Laser Pulses for Targeted Treatment of Retinoblastoma” with the Department of Electrical and Computer Engineering and Department of Oncology in University of Alberta.Retinoblastoma is a cancerous disease that affects the retina, and primarily affects young children.

This work presents a new technique to treat retinoblastoma cancer that ties physics, biology and computational modellingusing gold nanorods and femtosecond laser pulses.  Femtosecond laser pulses are delivered through the various components of the eye, and absorbed by the gold nanorods. Once the gold nanorods absorb the laser light pulse, they heat up and explode inside the cancer cells, leading to targeted destruction of retinoblastoma cells. The report on this project was accepted as is in the Advanced Therapeutics Journal  and has been chosen to appear on cover.

 

Visiting Reaserch Student

I am pleased to welcome Arezou Rashidi who joined us on early march 2018 as Visiting PhD Research Student. Arezou is fourth year Ph.D. student in the field of Computational Nanophotonics in Physics Department at the University of Tabriz, Iran. She was recognized as a top student (1st rank) during her B.Sc. and M.Sc. In 2008, Arezou was awarded as National Exceptional Talent in Physics from University of Tabriz and since then she has been a member of National Exceptional Talent Club. Her current research projects are focused on Photonic Crystals and Graphene-Based Nanostructures. So far she has published several papers in different journals such as Superlattices and Microstructures, Applied Optics and The European Physical Journal B.

Minor in Physics

  • I am pleased to announce that the Minor in Physics has passed all the institutional steps and will be officially at Nipissing University curriculum on September 2018. If you are interested to know more details about this program please feel free to contact me or refer to teaching tab on my personal website.

SPIE Nanoscience + Engineering

SPIE Nanoscience + Engineering – 9 August 2017 –  San Diego, California United States
Title: “Tunable coupling between exciton-polariton and exciton-surface plasmon in hybrid systems consisting of VO2 nanoparticles and quantum dots”

Abstract: Vanadium dioxide (VO2) features a semiconductor to metal phase change characteristic that leads to an abrupt change in the particle’s optical properties. A hybrid system consisting of semiconductor quantum dot (SQD) and vanadium dioxide nanoparticle (VO2NP) can support the coherent coupling of exciton-polaritons and exciton-plasmon polaritons in the semiconductor and metal phases of the VO2NP, respectively. In this talk, we theoretically show that the controlling over the VO2NP phase change transition alters the SQD optical response drastically in comparison to a bare SQD. The results can be applied to the design of thermal sensors at the nanoscale.

Math Talk Series

Math Talk Series – 28 May, 2017 – 1:15pm to 2:30pm in room A129.Title: “Quantum Dot Nanophotonics”

Abstract:  Quantum dots (QDs), known as artificial atoms, are nanoscale semiconductor materials with a unique size-tunable optical property. These unique size dependent qualities lead to a narrow photoluminescence spectrum in the range of visible to infrared light. QDs have attracted tremendous attention in the past few years for a variety of scientific and commercial applications such as biological sensors, quantum commuting, photovoltaic and light emitting devices. In this talk we present a brief description of QDs and their associated optical properties,highlighting the concept the size dependent photo-physical properties. We also show how the coupling of QDs with the other nanostructures can dramatically alter the QDs photoluminescence for further development of QDs for each respective application.

Photonic West

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

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.