Objective: Use plasmon-enhanced photochemical reactions to map the polarization-dependent near fields of optical antennas. Approach: Use the anisotropic nano-crescent structure and SU-8 photo-resist. SU-8 exposure accomplished through plasmon-enhanced multi-photon absorption by 800 nm light.
Approach: Use the anisotropic nano-crescent structure and SU-8 photo-resist. SU-8 exposure accomplished through plasmon-enhanced multi-photon absorption by 800 nm light.
Results and Significance: Distinct anisotropic local-field patterns directly visualized through electron or AFM microscopy; patterns match simulation predictions. This is the first time field patterns of these structures have been mapped.
AFM image of gold nanocrescent structure.
SEM image of nanocrescent under short-axis excitation after SU-8 resist development; calculated field pattern below.
SEM image under long-axis excitation after resist development.
