Controlling the state of polarization via optical nanoantenna feeding with surface plasmon polaritons

Optical nanoantennas, usually referring to metal structures with localized surface plasmon resonance, could efficiently convert confined optical energy to free-space light, and vice versa. But it is difficult to manipulate the confined visible light energy for its nanoscale spatial extent. Here, a s...

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Veröffentlicht in:Applied physics letters 2016-03, Vol.108 (13)
Hauptverfasser: Xie, Yu-Bo, Liu, Zheng-Yang, Wang, Qian-Jin, Sun, Guang-Hou, Zhang, Xue-Jin, Zhu, Yong-Yuan
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Sprache:eng
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Zusammenfassung:Optical nanoantennas, usually referring to metal structures with localized surface plasmon resonance, could efficiently convert confined optical energy to free-space light, and vice versa. But it is difficult to manipulate the confined visible light energy for its nanoscale spatial extent. Here, a simple method is proposed to solve this problem by controlling surface plasmon polaritons to indirectly manipulate the localized plasmons. As a proof of principle, we demonstrate an optical rotation device which is a grating with central circular polarization optical nanoantenna. It realized the arbitrary optical rotation of linear polarized light by controlling the retard of dual surface plasmon polaritons sources from both side grating structures. Furthermore, we use a two-parameter theoretical model to explain the experimental results.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4944896