Dr. Serge Ecoffey Profile

Dr. Serge Ecoffey

at Univ de Sherbrooke

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Author

Publications (4)

Proceedings Article | 20 November 2024 Poster + Paper

First demonstration of MEMS Fabry-Perot pixel arrays for reprogrammable photomasks

Md Iftekharul Islam, Amrid Amnache, Richard Beaudry, Maurice Delafosse, Serge Ecoffey, Luc Fréchette

Proceedings Volume 13216, 132162G (2024) https://doi.org/10.1117/12.3034648

KEYWORDS: Lithography steppers, Microfabrication, Photomasks, Microelectromechanical systems, Optical transmission, Fabry Perot interferometers, Optical lithography, Lithography

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Proceedings Article | 22 August 2024 Paper

Reaching strong light-matter coupling regime with plasmonic nano-cube over mirror array and TMD monolayer

Raphael Gherman, Guillaume Beaudin, Pierre Levesque, Steve MacLean, Serge Ecoffey, Paul Charette

Proceedings Volume PC12896, PC128961A (2024) https://doi.org/10.1117/12.2692915

KEYWORDS: Quantum plasmonics, Gold, Reflectivity, Quantum regime, Gold nanoparticles, Quantum emitters, Mirrors, Finite-difference time-domain method, Monolayers, Fabrication

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Proceedings Article | 1 April 2020 Presentation

Improving silicon nitride ring resonator performances on 300 mm industrial environment for point of care applications (Conference Presentation)

Michele Calvo, Guillaume Beaudin, Laurence Mercier-Coderre, Pauline Girault, Pedro Rojo-Romeo, Regis Orobtchouk, Romain Stricher, Stephane Monfray, Serge Ecoffey, Dominique Drouin, Frederic Boeuf, Michael Canva, Paul Charette

Proceedings Volume 11361, 1136105 (2020) https://doi.org/10.1117/12.2555339

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Point-of-care tests (POCT) are important for detecting illnesses and monitoring patients without the need of a medical laboratory. To be useful, POCT must be sensitive, specific, integrated, and affordable. Since the early 2000s, integrated photonics have offered a possible solution for this problem. In particular, silicon micro-ring resonators represent a compact and sensitive choice known in the industry. This paper details the design, fabrication, and characterization of two methods for improving the performance of ring resonators by engineering their cross section. More precisely, improving devices made out of silicon nitride in an industrial environment to work in the infrared (around 1.31 µm). The first approach is to selectively excite the first order mode of the ring resonator’s waveguide. The first order mode, with its greater exposure to the sensing liquid than the fundamental mode, results in a higher device sensitivity. The second method consists in coupling a dielectric mode with a surface plasmon polariton (SPP) forming a hybrid plasmonic waveguide. Hybrid plasmonic waveguides combine the low losses of the dielectric mode with the high sensitivity of the SPP, which increases the sensitivity in comparison to conventional dielectric ring resonators. Furthermore, hybrid plasmonic micro-ring resonators make possible a stable and easy differential functionalization. Through the optical characterization of the devices, this study shows an experimental sensitivity of first order ring resonators of over 200 nm/RIU* and of hybrid plasmonic devices of 300 nm/RIU*. This demonstrates improvement with respect to the reference silicon nitride dielectric ring (120 nm/RIU*). Characterizations were performed using a PolyDiMethylSiloxane (PDMS) fluidic system to prove the compatibility of the substrate to POCT applications. This paper shows two alternative approaches to integrated nano-photonic sensing for point of care testing. The proposed structures, demonstrate not only a higher sensitivity, but consider selectivity and manufacturing issues, which are fundamental for POCT development. *RIU = Refractive Index Unit

Proceedings Article | 27 February 2019 Presentation + Paper

A porous Ge/Si interface layer for defect-free III-V multi-junction solar cells on silicon

Youcef Bioud, Meghan Beattie, Abderraouf Boucherif, Mourad Jellit, Romain Stricher, Serge Ecoffey, Gilles Patriarche, David Troadec, Ali Soltani, Nadi Braidy, Matthew Wilkins, Christopher Valdivia, Karin Hinzer, Dominique Drouin, Richard Arès

Proceedings Volume 10913, 109130T (2019) https://doi.org/10.1117/12.2511080

KEYWORDS: Silicon, Germanium, Interfaces, Multijunction solar cells, Photovoltaics, Electrochemical etching, Transmission electron microscopy, Chemical mechanical planarization, Solar cells

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