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.
The transport of quantum states without loss of "coherence" is extremely important for realizing quantum information systems. Quantum effects have been demonstrated in exotic systems, such as cold atoms suspended in magnetic fields, but these systems are extremely challenging to realise. In this work we will translate this work into the chemical domain, using thin films of "J-aggregates". These J-aggregates are quantum many-body systems characterized by the sharing of excitonic states over two or more molecules. This novel organic quantum soft-matter platform can confine the light at the nanoscale taking the advantages of supramolecular chemistry to design properties on demand.
Plasmonic materials are well stablished and used in fields like biomedicine or energy harvesting due to their exceptional optical properties. One of the most interesting characteristics of plasmonic nanoparticles is their ability to confine light at the nanoscale. Nevertheless, such behaviour can also be found in some non-metallic materials as in organic-excitonic materials based on J-aggregates. Herein, we evaluate the synthetic route to obtain colloidal dispersions of excitonic core-shell nanoparticles that can mimicking plasmonic behaviour.
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