Fourier imaging study of efficient near-field optical coupling in solid   immersion fluorescence microscopy
  We measured images and Fourier images of fluorescence for 0.11- and 0.22-$\mu$m-diameter dye-doped polystyrene micro-sphere beads on a solid immersion lens, and experimentally verified strongly-angle-dependent fluorescence intensities due to efficient near-field optical coupling in solid immersion fluorescence microscopy. The results are interpreted in comparison with calculated emission patterns of an emission dipole placed near a solid surface, which establish a basic model for high-collection efficiency in solid-immersion fluorescence microscopy. 
Masahiro Yoshita, Kazuko Koyama, Motoyoshi Baba, and Hidefumi Akiyama