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

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 len...

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Veröffentlicht in:	Nano letters 2014-02, Vol.14 (2), p.704-709
Hauptverfasser:	Yang, Jing, Xiao, Xiao, Hu, Chuang, Zhang, Weiwei, Zhou, Shuxiang, Zhang, Jiasen
Format:	Artikel
Sprache:	eng
Schlagworte:	Applied sciences Asymmetry Broadband Collective excitations (including excitons, polarons, plasmons and other charge-density excitations) Condensed matter: electronic structure, electrical, magnetic, and optical properties Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures Electronics Exact sciences and technology Joining Launching Molecular electronics, nanoelectronics Nanostructure Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures Physics Plasmonics Plasmons Polaritons Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices Surface and interface electron states
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Zusammenfassung:	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.
ISSN:	1530-6984 1530-6992
DOI:	10.1021/nl403954h