Three-dimensional optical antennas: Nanocones in an apertureless scanning near-field microscope

Fleischer, M.; Stanciu, C.; Stade, F.; Stadler, J.; Braun, K.; Heeren, A.; Häffner, M.; Kern, D. P.; Meixner, A. J.
September 2008
Applied Physics Letters;9/15/2008, Vol. 93 Issue 11, p111114
Academic Journal
A sharp-tipped gold nanocone and the vertically aligned metallic tip of a near-field optical microscope together form a three-dimensional optical antenna with a highly controllable gap. Confocal measurements with different laser modes show the efficient axial excitation of the cones with a longitudinally polarized field. In the antenna configuration, extremely strong field enhancement up to a factor of 100 is obtained by tuning the gap between the two sharp tips down to few nanometers.


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