Gold dimer nanoantenna with slanted gap for tunable LSPR and improved SERS
Type
ArticleAuthors
Kessentini, SamehBarchiesi, Dominique
D'Andrea, Cristiano
Toma, Andrea
Guillot, Nicolas
Di Fabrizio, Enzo M.

Fazio, Barbara
Maragó, Onofrio M.
Gucciardi, Pietro Giuseppe
Lamy De La Chapelle, Marc L.
KAUST Department
Biological and Environmental Sciences and Engineering (BESE) DivisionMaterial Science and Engineering Program
Physical Science and Engineering (PSE) Division
Date
2014-02-03Online Publication Date
2014-02-03Print Publication Date
2014-02-13Permanent link to this record
http://hdl.handle.net/10754/563393
Metadata
Show full item recordAbstract
We focus on improving the surface-enhanced Raman scattering (SERS) of dimer nanoantenna by tailoring the shape of the coupled nanoantennas extremities from rounded to straight or slanted ones. A numerical model based on the discrete dipole approximation method-taking into account periodicity, adhesion layer, and roughness-is first validated by comparison with localized surface plasmon resonance (LSPR) and SERS experiments on round-edged dimer nanoantennas and then used to investigate the effect of the straight or slanted gap in the dimer antenna. Simulations show that both LSPR and SERS can be tuned by changing the gap slanting angle. The SERS enhancement factor can also be improved by 2 orders of magnitude compared to the one reached using a rounded gap. Therefore, the slanting angle can be used as a new control parameter in the design of SERS substrates to guarantee stronger field confinement and higher sensitivity, especially as its feasibility is demonstrated. © 2014 American Chemical Society.Citation
Kessentini, S., Barchiesi, D., D’Andrea, C., Toma, A., Guillot, N., Di Fabrizio, E., … Lamy de la Chapelle, M. (2014). Gold Dimer Nanoantenna with Slanted Gap for Tunable LSPR and Improved SERS. The Journal of Physical Chemistry C, 118(6), 3209–3219. doi:10.1021/jp409844ySponsors
The authors thank the Nanoantenna European Project (FP7 Health-F5-2009-241818), the Region Champagne-Ardennes, the Conseil Regional de l'Aube, and MIUR (Project PRIN 2008J858Y7 and Programma Operativo Nazionale Ricerca e Competitivita 2007-2013, PON01_01322 PANREX) for financial support.Publisher
American Chemical Society (ACS)ae974a485f413a2113503eed53cd6c53
10.1021/jp409844y