An inverted honeycomb plasmonic lattice as an efficient refractive index sensor

Javier Rodríguez-álvarez (Corresponding author), Lorenzo Gnoatto, Marc Martínez-Castells, Albert Guerrero, Xavier Borrisé, Arantxa Fraile Rodríguez, Xavier Batlle, Amílcar Labarta

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

2 Citaten (Scopus)
23 Downloads (Pure)

Samenvatting

We present an efficient refractive index sensor consisting of a heterostructure that contains an Au inverted honeycomb lattice as a main sensing element. Our design aims at maximizing the out-of-plane near-field distributions of the collective modes of the lattice mapping the sensor sur-roundings. These modes are further enhanced by a patterned SiO2 layer with the same inverted honeycomb lattice, an SiO2 spacer, and an Au mirror underneath the Au sensing layer that contrib-ute to achieving a high performance. The optical response of the heterostructure was studied by numerical simulation. The results corresponding to one of the collective modes showed high sensitivity values ranging from 99 to 395 nm/RIU for relatively thin layers of test materials within 50 and 200 nm. In addition, the figure of merit of the sensor detecting slight changes of the refractive index of a water medium at a fixed wavelength was as high as 199 RIU−1. As an experimental proof of concept, the heterostructure was manufactured by a simple method based on electron beam lithography and the measured optical response reproduces the simulations. This work paves the way for improving both the sensitivity of plasmonic sensors and the signal of some enhanced surface spec-troscopies.

Originele taal-2Engels
Artikelnummer1217
Aantal pagina's12
TijdschriftNanomaterials
Volume11
Nummer van het tijdschrift5
DOI's
StatusGepubliceerd - 21 mei 2021
Extern gepubliceerdJa

Bibliografische nota

Publisher Copyright:
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.

Financiering

This research was funded by Spanish MINECO, grant number PGC2018-097789-B-I00, and the European Union FEDER funds. We want to thank Pau Molet and A. Mihi, Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), for the FTIR measurements. Funding: This research was funded by Spanish MINECO, grant number PGC2018-097789-B-I00, and the European Union FEDER funds.

FinanciersFinanciernummer
ICMAB-CSIC
Institut de Ciència de Materials de Barcelona
European Commission
Ministerio de Economía y CompetitividadPGC2018-097789-B-I00

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