Self-assembled plasmonic nanoparticle clusters.
The self-assembly of colloids is an alternative to top-down processing that enables the fabrication of nanostructures. We show that self-assembled clusters of metal-dielectric spheres are the basis for nanophotonic structures. By tailoring the number and position of spheres in close-packed clusters, plasmon modes exhibiting strong magnetic and Fano-like resonances emerge. The use of identical spheres simplifies cluster assembly and facilitates the fabrication of highly symmetric structures. Dielectric spacers are used to tailor the interparticle spacing in these clusters to be approximately 2 nanometers. These types of chemically synthesized nanoparticle clusters can be generalized to other two- and three-dimensional structures and can serve as building blocks for new metamaterials.
School of Engineering and Applied Sciences, Harvard University, 29 Oxford Street, Cambridge, MA 02138, USA.
Jonathan A
JA
Fan
Chihhui
C
Wu
Kui
K
Bao
Jiming
J
Bao
Rizia
R
Bardhan
Naomi J
NJ
Halas
Vinothan N
VN
Manoharan
Peter
P
Nordlander
Gennady
G
Shvets
Federico
F
Capasso