Sub-wavelength patterning of the optical near-field.
We report the sub-wavelength patterning of the optical near-field by total internal reflection illumination of a regular array of resonant gold nano-particles. Under appropriate conditions, the in-plane coupling between Localized Surface Plasmon (LSP) fields gives rise to sub-wavelength light spots between the structures. Measurements performed with an Apertureless Scanning Near-Field Optical Microscope (ASNOM) show a good agreement with theoretical predictions based on the Green dyadic method. This concept might offer a convenient way to elaborate extended optical trap landscapes for manipulation of sub-micrometer systems.
Quidant
Romain
R
Badenes
Goncal
G
Cheylan
Stéphanie
S
Alcubilla
Ramon
R
Weeber
Jean-Claude
JC
Girard
Christian
C