Seminar of Shuwen ZENG : "Ultra-sensitive Plasmonic Biosensors based on Two-Dimensional NanoMaterials"

We are pleased to welcome on 02/05/2023 Dr. Shuwen Zeng from L2N to deliver a seminar at 15:00 in room RDC-ACC-008 (Temis site of FEMTO-ST)

Biography: Dr. Shuwen ZENG is currently a Chargée de Recherche CNRS at L2n (Laboratoire Lumière, nanomatériaux et nanotechnologies), Université de Technologie de Troyes, France. She has been awarded EU Marie Skłodowska-Curie Individual Fellow in 2018 with Photonics department at XLIM Research Institute, CNRS. She also worked as a research fellow at CNRS-International-NTU-THALES Research Alliance (CINTRA)/UMI 3288, Singapore from 2014 to 2018. Before that, she received the Ph.D. degree from the School of Electrical and Electronic Engineering at Nanyang Technological University, Singapore. Her main research interests focus on engineering optical micro-/nanostructures-based ultrasensitive chemical and biological sensors. Dr. Zeng is a senior member of the IEEE Photonics Society (IPS) and the Optical Society of America (OSA). She also currently serves as the main chair of Pacific Rim Conference on Lasers and Electro-Optics (CLEO Pacific Rim) and the IEEE Optoelectronics Global Conference (OGC) Technical Program Committees. She is also the associate editor of Sensors Journal and Journal of Frontiers of Nanophotonics in Biomedical Engineering. Dr. Zeng has published more than 60 peer-reviewed papers and served as reviewers for journals of Advanced Materials, Small, Optics Letters, Optics Express etc. and contributed over 25 invited conference/seminar talks (CLEO, SPIE, ICMAT, etc.).

Abstract:Surface plasmon resonance sensors are commonly used an effective tool for real-time monitoring biomolecular interactions. The sensing mechanism is based on the evanescent field perturbation at the metallic sensing substrate induced by the binding of chemical and biological molecules. Molecular binding interactions could be measured from the signal of reflected light, under the condition that the surface plasmon resonance is excited by the incident light. In this talk, I will present the use of hybrid 2D nanomaterials-based metasurface nanostructure as an enhanced sensing substrate. The thickness of the plasmonic sensing substrate is tuned in an atomic scale and optimized to improve the sensing capability. Here, both a sharp phase signal change and phase-related Goos-Hänchen signal shift were achieved due to the strong resonance at the surface of the sensing film. The enhanced plasmonic sensitivities of 2D nanostructures were systematically investigated. It is worth noting that the tunability of atomic layer led to the sensing substrate optimized with a narrow scale < 1 nm. Through a precise engineering of the metasurface substrates, 3 orders of magnitude improvement of the sensitivity were demonstrated compared to the one with pure gold sensing substrate. This hybrid 2D nanomaterial-based metasurfaces would provide a good opportunity for developing portable theranostic devices in clinical applications.