Title
Geometry-induced enhancement factor improvement in covered-gold-nanorod-dimer antennas
Date Issued
23 February 2021
Access level
open access
Resource Type
journal article
Author(s)
Publisher(s)
Royal Society of Chemistry
Abstract
Illuminated gapped-gold-nanorod dimers hold surface plasmon polaritons (SPPs) that can be engineered, by an appropriate choice of geometrical parameters, to enhance the electromagnetic field at the gap, allowing applications in molecular detectionviasurface-enhanced Raman spectroscopy (SERS). Envisioning hybrid devices in which the SERS spectroscopy of molecules in the gap is complemented by electrical measurements, it arises the question of designing efficient geometries to contact the nanorods without decreasing the enhancement factor (EF) of the nanoantenna,i.e., the figure of merit for SERS spectroscopy. Within this framework we theoretically study the feasibility to fabricate designs based on covering with gold the far-from-the-gap areas of the dimer. We show that by tuning the geometrical parameters of the designs these systems can reach enhancement factors larger than the best achieved in the uncovered dimer: this supremacy survives even in the presence of dimer asymmetries and vacancies at the interfaces between the nanorods and the covering layers. Our results show that geometrical modifications away from the gap can improve the optical response at the gap, thus enabling the use of these devices both for hybrid and optical applications.
Start page
9518
End page
9527
Volume
11
Issue
16
Language
English
OCDE Knowledge area
Nano-materiales
Scopus EID
2-s2.0-85102262589
Source
RSC Advances
ISSN of the container
20462069
Sponsor(s)
We thank Eduardo Martinez for useful discussions. This work has been supported by the Consejo Nacional de Ciencia, Tecnología e Innovación Tecnológica del Perú (CONCYTEC), Contract No. 174-2018-FONDECYT-BM. A. A. R acknowledges additional support from CONICET (Argentina) and the Abdus Salam International Centre for Theoretical Physics (Italy). M. L. P. acknowledges the funding from FONCyT, PICT-2016-2531 (Argentina); and Universidad Nacional de Cuyo, SeCTyP, 344 C022 (Argentina). I. A. R. acknowledges support from 2018 M.Sc. scholarship CONCYTEC (Perú) contract No. 167.
Sources of information:
Directorio de Producción Científica
Scopus