Publication:
Synthesis and raman detection of 5-amino-2-mercaptobenzimidazole self-assembled monolayers in nanoparticle-on-a-mirror plasmonic cavity driven by dielectric waveguides

Date

2024

Authors

Redolat, Javier
Camarena-Pérez, María
Griol, Amadeu
Sinusia Lozano, Miguel
Gómez-Gómez, María Isabel
Miele, Ermanno
Baumberg, Jeremy J.
Martínez, Alejandro
Pinilla-Cienfuegos, Elena

Director

Publisher

American Chemical Society
Acceso abierto / Sarbide irekia
Artículo / Artikulua
Versión publicada / Argitaratu den bertsioa

Project identifier

European Commission/Horizon 2020 Framework Programme/829067openaire
AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/PID2021-124618NB-C21/ES/recolecta

Abstract

Functionalization 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.

Description

Keywords

Chemical functionalization, Gold surfaces, Integrated waveguides, Interface engineering, Molecular optomechanics, Nanoparticle assembly, Nanoparticle on a mirror cavity, On-chip spectroscopy, Self-assembled monolayers

Department

Ingeniería Eléctrica, Electrónica y de Comunicación / Ingeniaritza Elektrikoa, Elektronikoa eta Telekomunikazio Ingeniaritza / Institute of Smart Cities - ISC

Faculty/School

Degree

Doctorate program

item.page.cita

Redolat, 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.

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© 2024 The Authors. This article is licensed under CC-BY 4.0

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