Enhanced light focusing in self-assembled optoplasmonic clusters with subwavelength dimensions.
Compact metallo-dielectric hybrid clusters with subwavelength dimensions are fabricated by template guided self-assembly. Elastic and inelastic scattering spectroscopy and electromagnetic simulations reveal that hybrid clusters comprising TiO(2) nanoparticles on top of a cluster of strongly coupled gold nanoparticles harness synergistic electromagnetic interactions between the building blocks. This results in a boost of the peak electric field intensity and a redistribution of the field in the ambient medium. The complex phase landscape in the clusters features optical vortices that enhance the magnetic field.
Department of Chemistry, Boston University, MA 02215, USA.
Yan
Y
Hong
Mahshid
M
Pourmand
Svetlana V
SV
Boriskina
Björn M
BM
Reinhard
D006046:Gold / Q000737:chemistry; D008027:Light; D055620:Optical Phenomena; D014025:Titanium / Q000737:chemistry
C009495:titanium dioxide; D006046:Gold; D014025:Titanium