Mr. Olivier-Michel Tardif Profile

Olivier-Michel Tardif

at Univ de Sherbrooke

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Proceedings Article | 21 August 2020 Poster + Presentation + Paper

Towards optimal light-matter coupling of colloidal quantum dots in optical fibers

Olivier-Michel Tardif, Arthur Perret, Claudine Allen

Proceedings Volume 11465, 114651D (2020) https://doi.org/10.1117/12.2568888

KEYWORDS: Optical fibers, Quantum dots, Semiconductors, Finite-difference time-domain method, Step index fibers

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For years, colloidal quantum dots (cQDs) have been optimized to offer great optical properties customizable through varying size and composition, and become the mature nanomaterial they currently are. However, their optical properties are affected by their environment. Hence, optical behaviour inconsistencies across experiments emerge from using cQDs inside different matrices. Therefore, their scope of applications has hitherto been greatly limited to specific applications. Recently, a new protocol to incorporate cQDs inside step index polymer optical fibers was developed by Whittaker and co-workers. It enables a cheap and robust fabrication of light-generating optical fibers. In addition to shielding cQDs from their outer environment, optical fibers also support optical modes. Hence, according to cavity quantum electrodynamics principles, these modes must alter the local density of optical states of the system, thus modifying the decay rate for each emitter located within the optical fibers. The current work revealed through finite difference time domain simulations only minimal modifications of the decay rate of a single quantum emitter located at the center of a polystyrene/PMMA core/clad step index fiber. Purcell factors staying within 2.2% of its initial value upon changes of the core radius were obtained. Thus, the Purcell enhancement offered by step index fibers is negligible compared to that of current semiconductor microcavities. Consequently, more exotic fiber geometries that offer greater Purcell effect must be identified before fast and cheap light-generating optical fiber can be made from this fabrication process.

Proceedings Article | 21 August 2020 Open Access

Bringing together graduate students and companies to solve industry-related problems in optics and photonics

Philippe Guay, Olivier-Michel Tardif, Lauris Talbot

Proceedings Volume 11480, 1148006 (2020) https://doi.org/10.1117/12.2566486

KEYWORDS: Electrical engineering, Photonics, Laser optics

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For the last fifteen years, Universite Laval’s SPIE Student Chapter has been building strong links between academia and industry to better prepare its student members to face their future career and to guide them towards industry. With now over fifty companies working in the field of optics and photonics in the Quebec City area alone, this makes it one of the best places in the world for students to visit companies and learn about companies’ expertise, equipment and work environments. In 2017 and for the first time at Universite Laval, the Student Chapter organized a day-long workshop where students had to solve real-world industry-related problems presented by high-end optics-related companies, i.e. an industrial seminar. Now at its fourth edition, a retrospective picture investigating the success of this event can be drawn. Over the years, more than 20 companies from Quebec City’s rich optics and photonics area were invited to present their domain of expertise to students through conferences, product demonstrations and original problem scenarios encountered in the past. As a result, no fewer than 100 students were familiarized with the work of these technology companies. They also exchanged and shared ideas with expert engineers, physicists, chemists, etc., and were given real-world problems to solve. From this process, direct links were created between the employers and the future employees, and a clearer picture was drawn for graduates envisioning an industrial career. Consequently, this event has shown to be beneficial for both students and companies.

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