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http://hdl.handle.net/2445/178188
Title: | An inverted Honeycomb plasmonic lattice as an efficient refractive index sensor |
Author: | Rodríguez Álvarez, Javier Gnoatto, Lorenzo Martínez Castells, Marc Guerrero, Albert Borrisé, Xavier Fraile Rodríguez, Arantxa Batlle, Xavier Labarta, Amílcar |
Keywords: | Nanoestructures Plasmons Nanostructures Plasmons (Physics) |
Issue Date: | 4-May-2021 |
Publisher: | MDPI |
Abstract: | 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 surroundings. 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 contribute 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 RIU1. 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 spectroscopies. |
Note: | Reproducció del document publicat a: https://doi.org/10.3390/nano11051217 |
It is part of: | Nanomaterials, 2021, vol. 11, num. 5, p. 1217 |
URI: | http://hdl.handle.net/2445/178188 |
Related resource: | https://doi.org/10.3390/nano11051217 |
ISSN: | 2079-4991 |
Appears in Collections: | Articles publicats en revistes (Física de la Matèria Condensada) |
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