Broadband Surface Plasmon Polariton Directional Coupling via Asymmetric Optical Slot Nanoantenna Pair

被引：74

作者：

Yang, Jing ^{[1
]}

Xiao, Xiao ^{[1
]}

Hu, Chuang ^{[1
]}

Zhang, Weiwei ^{[1
]}

Zhou, Shuxiang ^{[1
]}

Zhang, Jiasen ^{[1
,2
]}

机构：

[1] Peking Univ, Dept Phys, State Key Lab Mesoscop Phys, Beijing 100871, Peoples R China

[2] Collaborat Innovat Ctr Quantum Matter, Beijing 100871, Peoples R China

来源：

NANO LETTERS | 2014年 / 14卷 / 02期

基金：

中国国家自然科学基金;

关键词：

Surface plastron polaritons; optical slot nanoantennas; broadband; directional coupling plasmonic display devices; EXCITATION; EFFICIENT; ANTENNAS; LIGHT; HOLES;

D O I：

10.1021/nl403954h

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Surface plasmon polariton (SPP) coupling is a basic subject for plasmonic study and applications. Optical nanoantennas enable downscaling of the SPP coupling to subwavelength scales. In this study, asymmetric optical slot nanoantenna pairs composed of two optical slot nanoantennas with different lengths are proposed for SPP directional coupling. Broadband unidirectional launching of SPPs is achieved, and the extinction ratio obtained experimentally reaches up to 44. The bandwidth is larger than 157 nm. Furthermore, SPP direction-selective radiation is demonstrated using the asymmetric optical slot nanoantenna pairs. A novel plasmonic display device showing the propagation direction of SPPs is achieved by employing asymmetric optical slot nanoantenna pairs without any electric device. Asymmetric optical slot nanoantenna pairs have large potential in the directional control of SPP launching and radiation and can be very useful in compact optical circuits and other photonic integrations.

引用

页码：704 / 709

页数：6

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