Local field enhancement: comparing self-similar and dimer nanoantennas
  We study the local field enhancement properties of self-similar nanolenses and compare the obtained results with the performance of standard dimer nanoantennas. We report that, despite the additional structural complexity, self-similar nanolenses are unable to provide significant improvements over the field enhancement performance of standard plasmonic dimers. 
Giovanni Pellegrini, Michele Celebrano, Marco Finazzi, Paolo Biagioni
physics.optics