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

被引：51

作者：

Fleischer, M. ^{[1
]}

Stanciu, C. ^{[2
]}

Stade, F. ^{[1
]}

Stadler, J. ^{[2
]}

Braun, K. ^{[2
]}

Heeren, A. ^{[1
]}

Haeffner, M. ^{[1
]}

Kern, D. P. ^{[1
]}

Meixner, A. J. ^{[2
]}

机构：

[1] Univ Tubingen, Inst Appl Phys, D-72076 Tubingen, Germany

[2] Univ Tubingen, Inst Phys & Theoret Chem, D-72076 Tubingen, Germany

来源：

APPLIED PHYSICS LETTERS | 2008年 / 93卷 / 11期

关键词：

D O I：

10.1063/1.2987485

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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. (C) 2008 American Institute of Physics.

引用

页数：3

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