Tunable directional coupling of surface plasmon polaritons with linearly polarized light

A tunable directional surface plasmon polaritons (SPP) coupler, which utilizes the polarization direction of linearly polarized incident light to control the SPP coupling direction, is proposed. The SPP coupler consists of a column of V-shaped slot nanoantennas, which can support two kinds of plasmo...

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Published inApplied physics. B, Lasers and optics Vol. 122; no. 1; pp. 1 - 6
Main Authors Huang, Feng, Jiang, Xiangqian, Yang, Hanning, Li, Siren, Sun, Xiudong
Format Journal Article
LanguageEnglish
Published Berlin/Heidelberg Springer Berlin Heidelberg 2016
Subjects
Couplers
Coupling
Engineering
Extinction
Incident light
Lasers
Optical Devices
Optics
Photonics
Physical Chemistry
Physics
Physics and Astronomy
Plasmons
Polaritons
Polarization
Quantum Optics
Resonant Mode
Coupling Coefficient
Gold Film
Power Flow
Surface Plasmon Polaritons
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Summary:A tunable directional surface plasmon polaritons (SPP) coupler, which utilizes the polarization direction of linearly polarized incident light to control the SPP coupling direction, is proposed. The SPP coupler consists of a column of V-shaped slot nanoantennas, which can support two kinds of plasmon resonant modes that have opposite symmetries. By controlling the polarization direction of linearly polarized incident light, the power flow of SPP coupled to the two opposite directions perpendicular to the column is continuously tuned. For 45° and 135° polarized incidence, SPP are unidirectional coupled to the two opposite directions, respectively. A highest extinction ratio of 31.6 dB is achieved, and the extinction ratio keeps larger than 10 dB within a wavelength of 135 nm.
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ISSN:0946-2171
1432-0649
DOI:10.1007/s00340-015-6306-7