Interference, Coupling, and Nonlinear Control of High-Order Modes in Single Asymmetric Nanoantennas
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- 作者：Martina Abb ; Yudong Wang ; Pablo Albella ; C. H. de Groot ; Javier Aizpurua ; Otto L. Muskens
- 刊名：ACS Nano
- 出版年：2012
- 出版时间：July 24, 2012
- 年：2012
- 卷：6
- 期：7
- 页码：6462-6470
- 全文大小：696K
- 年卷期：v.6,no.7(July 24, 2012)
- ISSN：1936-086X
文摘
We investigate theoretically and experimentally the structure of plasmonic modes in individual asymmetric dimer antennas. Plasmonic near-field coupling of high-order modes results in hybridization of bright and dark modes of the individual nanorods, leading to an anticrossing of the coupled resonances. For two bright modes, hybridization results in a capacitive red shift and super-radiant broadening. We show that the properties of asymmetric dimers can be used for nonlinear control of spectral modes and demonstrate such a nonlinear effect by measuring the modulation of a hybrid asymmetric dimer鈥擨TO antenna. With use of full electrodynamical calculations, we find that the properties of the near-field nonlinear responses are distinctly different from the far-field, which opens up new routes for nonlinear control of plasmonic nanosystems.