Directional far-field response of a spherical nanoantenna.
Directional far-field response of a spherical nanoantenna.
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DOI：
10.1364/ol.36.002146
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发表时间：
2011-06
期刊：
影响因子：
3.6
通讯作者：
Yang G. Liu;Yan Li;W. Sha
中科院分区：
文献类型：
--
作者：
Yang G. Liu;Yan Li;W. Sha
We study the directional far-field response of a spherical nanoantenna via engineering the plasmonic nanosphere's distance, size, and material. A unified pattern synthesis approach based on the T-matrix method and the particle swarm optimization is proposed for the directional beamforming of the nanoantenna. The angular response of the directional nanoantenna is very sensitive to the material change but is immunized to the random error of the spatial position of each particle. The physical origin of the high directionality is attributed to the coherent near-field distribution with large correlation length. This work provides the fundamental theory and physics for future nanoantenna design.
