Open AccessTailoring the directivity of both excitation and emission of dipole simultaneously with two-colored plasmonic antenna
Author(s) -
Zheng Xi,
Yonghua Lu,
Wenhai Yu,
Peijun Yao,
Pei Wang,
Hai Ming
Publication year - 2013
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.21.029365
Subject(s) - optics , directivity , antenna (radio) , plasmon , physics , scattering , excitation , dipole antenna , radiation pattern , dipole , light scattering , telecommunications , quantum mechanics , computer science
We report a two-colored plasmonic antenna which can control the directivity of the excitation and emission light independently and simultaneously. By carefully tuning the phase difference of the constituting elements of the antenna, unidirectional fluorescence emission and laser light scattering can be obtained. In particular, the direction of the maximum emission and minimum scattering can be tailored in the same direction resulting improvement of signal to noise ratio in single molecule experiment. A two-dipole model is applied to describe the phenomena. The radiation and scattering pattern can be further tuned by varying the antenna structure.