Abstract

The current studies indicate that surface plasmons (SP) stimulated by metallic nanostructures can break the diffraction limit and concentrate light into sub-wavelength scale, which provide a method to study the interaction between near-field optics and metal nanoparticles. A kind of periodically patterned metallic nanostructures that combine nanometer thickness gold film with silicon wafer has been developed in this paper. Through changing the structural parameters and further comparing the reflectance and electric field intensity distribution based on simulation, the most effective nanostructures can be selected. The experimental results demonstrate that the metallic nanostructures can effectively stimulate surface plasmons. Moreover, petal-shaped field enhancement have been observed on scattering near-field optical microscope SNOM images of λ =633nm, which are prove to be formed by the propagation of surface plasmons.

© 2016 Optical Society of America