Scanning plasmonic microscopy by image reconstruction from the Fourier space
Abstract
We demonstrate a simple scheme for high-resolution imaging of nanoplasmonic structures that basically removes most of the resolution limiting allowed light usually transmitted to the far field. This is achieved by implementing a Fourier lens in a near-field scanning optical microscope (NSOM) operating in the leakage-radiation microscopy (LRM) mode. The method consists of reconstructing optical images solely from the plasmonic `forbidden' light collected in the Fourier space. It is demonstrated by using a point-like nanodiamond-based tip that illuminates a thin gold film patterned with a sub-wavelength annular slit. The reconstructed image of the slit shows a spatial resolution enhanced by a factor compared to NSOM images acquired directly in the real space.
Cite
@article{arxiv.1402.5313,
title = {Scanning plasmonic microscopy by image reconstruction from the Fourier space},
author = {O. Mollet and S. Huant and A. Drezet},
journal= {arXiv preprint arXiv:1402.5313},
year = {2015}
}