Enabling Self-Induced Back-Action Trapping of Gold Nanoparticles in Metamaterial Plasmonic Tweezers.
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2023-06
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The pursuit for efficient nanoparticle trapping with low powers has led to optical tweezers technology moving from the conventional free-space configuration to advanced plasmonic systems. However, trapping nanoparticles smaller than 10 nm still remains a challenge even for plasmonic tweezers. Proper nanocavity design and excitation has given rise to the self-induced back-action (SIBA) effect offering enhanced trap stiffness with decreased laser power. In this work, we investigate the SIBA effect in metamaterial tweezers and its synergy with the exhibited Fano resonance. We demonstrate stable trapping of 20 nm gold particles with trap stiffnesses as high as 4.18 ± 0.2 (fN/nm)/(mW/μm2) and very low excitation intensity. Simulations reveal the existence of two different groups of hotspots on the plasmonic array. The two hotspots exhibit tunable trap stiffnesses, a unique feature that can allow for sorting of particles and biological molecules based on their characteristics.
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Bouloumis, Theodoros D, Domna G Kotsifaki and Síle Nic Chormaic (2023). Enabling Self-Induced Back-Action Trapping of Gold Nanoparticles in Metamaterial Plasmonic Tweezers. Nano letters, 23(11). pp. 4723–4731. 10.1021/acs.nanolett.2c04492 Retrieved from https://hdl.handle.net/10161/28989.
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Domna Kotsifaki
Her research focuses on optical manipulation and sensing at the micro- and nanoscale. At DKU, she leads a research group pioneering the use of plasmonic nanostructures and metamaterials for advanced biosensing—such as detecting viruses and proteins—and for environmental monitoring, including the identification of micro-/nano-plastics in local water systems. Her teaching interests at DKU include Biophysics, Optics and Modern Physics, as well as General Physics.
She has an extensive publication record in high-impact journals including Nano Letters, Nanophotonics, and Science of the Total Environment. Her research output since joining DKU in 2022 includes numerous articles in journals such as Advanced Physics Research, Heliyon, and Biomedical Optics Express, a significant proportion of which are co-authored by DKU undergraduate students. Her work is presented on the international stage through invited talks at major conferences, complemented by numerous contributed presentations. The impact of her mentorship is further demonstrated by her students receiving international poster awards and scholarships for their research. She is a recipient of a Marie Skłodowska-Curie Actions Seal of Excellence and has a strong track record of securing competitive research funding as PI, with awards from the Kunshan Government and the JSPS Kakenhi program. An active leader in her field, she holds key organizational roles, including Program and General Chair for the Optica Biophotonics Congress -OPTICA (2022-2025) and Associate Editor for Optics Express (2023-present). She also contributes as an expert reviewer for prestigious European grant programs (2024-present).
Kotsifaki holds a B.Sc. in Physics from the University of Patras, Greece, an M.Sc. in Physics of Laser Communications from the University of Essex, UK, and a Ph.D. in Physics from the National Technical University of Athens, Greece. Prior to her appointment at Duke Kunshan University, she was a Postdoctoral Scholar at the National Hellenic Research Foundation in Greece, a Postdoctoral Scholar at NTUA, and a Staff Scientist at the Okinawa Institute of Science and Technology Graduate University (OIST) in Japan.
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