Redolat, JavierCamarena-Pérez, MaríaGriol, AmadeuSinusia Lozano, MiguelGómez-Gómez, María IsabelVázquez Lozano, Juan EnriqueMiele, ErmannoBaumberg, Jeremy J.Martínez, AlejandroPinilla-Cienfuegos, Elena2024-09-052024-09-052024Redolat, J., Camarena-Pérez, M., Griol, A., Lozano, M. S., Gómez-Gómez, M. I., Vázquez-Lozano, J. E., Miele, E., Baumberg, J. J., Martínez, A., Pinilla-Cienfuegos, E. (2024) Synthesis and raman detection of 5-amino-2-mercaptobenzimidazole self-assembled monolayers in nanoparticle-on-a-mirror plasmonic cavity driven by dielectric waveguides. Nano Letters, 24(12), 3670-3677. https://doi.org/10.1021/acs.nanolett.3c04932.1530-698410.1021/acs.nanolett.3c04932https://academica-e.unavarra.es/handle/2454/51553Functionalization of metallic surfaces by molecular monolayers is a key process in fields such as nanophotonics or biotechnology. To strongly enhance light-matter interaction in such monolayers, nanoparticle-on-a-mirror (NPoM) cavities can be formed by placing metal nanoparticles on such chemically functionalized metallic monolayers. In this work, we present a novel functionalization process of gold surfaces using 5-amino-2-mercaptobenzimidazole (5-A-2MBI) molecules, which can be used for upconversion from THz to visible frequencies. The synthesized surfaces and NPoM cavities are characterized by Raman spectroscopy, atomic force microscopy (AFM), and advancing-receding contact angle measurements. Moreover, we show that NPoM cavities can be efficiently integrated on a silicon-based photonic chip performing pump injection and Raman-signal extraction via silicon nitride waveguides. Our results open the way for the use of 5-A-2MBI monolayers in different applications, showing that NPoM cavities can be effectively integrated with photonic waveguides, enabling on-chip enhanced Raman spectroscopy or detection of infrared and THz radiation.application/pdfeng© 2024 The Authors. This article is licensed under CC-BY 4.0Chemical functionalizationGold surfacesIntegrated waveguidesInterface engineeringMolecular optomechanicsNanoparticle assemblyNanoparticle on a mirror cavityOn-chip spectroscopySelf-assembled monolayersinfo:eu-repo/semantics/article2024-09-05info:eu-repo/semantics/openAccess