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11 June 2024 Plexcitonic nanorattles for ultra-efficient SERS detection
C. Estévez-Varela, S. Núñez-Sánchez, P. Piñeiro-Varela, D. Jiménez de Aberasturi, L. M. Liz-Marzán, J. Pérez-Juste, I. Pastoriza-Santos
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Proceedings Volume PC12991, Nanophotonics X; PC129910Q (2024) https://doi.org/10.1117/12.3017455
Event: SPIE Photonics Europe, 2024, Strasbourg, France
Abstract
In this work, we prepare plexcitonic nanoparticles composed by plasmonic nanoparticles, Au@Ag@mSiO2 nanorattles, and J-aggregates of TDBC cyanine dye to be used as ultra-efficient SERS-tags. The methodology used here allowed us to improve the colloidal stability of the plexcitonic nanoparticles. The optical properties have been characterised by UV-vis-NIR and Surface-Enhanced Raman Scattering (SERS) spectroscopies. Besides, finite-difference time-domain (FDTD) calculations revealed that the electromagnetic field is strongly confined into the J-aggregate deposited over the surface of the plasmonic nanoparticle at wavelengths near the upper plexciton. However, for the lower plexciton mode, the electromagnetic field decays through the J-aggregate/water interface. In summary, the plexcitonic nanoparticles showed high SERS efficiency for 532 nm and 633 nm laser lines, even reaching single-nanoparticle detection. The results obtained showed us the significance of strong coupling effect which might lead new possibilities for ultrasensitive biosensing and bioimaging.
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C. Estévez-Varela, S. Núñez-Sánchez, P. Piñeiro-Varela, D. Jiménez de Aberasturi, L. M. Liz-Marzán, J. Pérez-Juste, and I. Pastoriza-Santos "Plexcitonic nanorattles for ultra-efficient SERS detection", Proc. SPIE PC12991, Nanophotonics X, PC129910Q (11 June 2024); https://doi.org/10.1117/12.3017455
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KEYWORDS
Surface enhanced Raman spectroscopy
Nanoparticles
Plasmonics
Electric fields
Light-matter interactions
Finite-difference time-domain method
Polaritons
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