1.School of Physics & Astronomy, University of Birmingham, Birmingham B15 2TT, UK
2.State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments, Tsinghua University, Beijing 100084, China
3.Department of Physics, University of Paderborn, D-33098 Paderborn, Germany
Author bio:
Dr S Zhang, School of Physics & Astronomy, University of Birmingham, Birmingham B15 2TT, UK Email: s.zhang@bham.ac.uk
Huang, L. L. et al. Helicity dependent directional surface plasmon polariton excitation using a metasurface with interfacial phase discontinuity. Light: Science & Applications, 2, e70 (2013).
DOI:
Huang, L. L. et al. Helicity dependent directional surface plasmon polariton excitation using a metasurface with interfacial phase discontinuity. Light: Science & Applications, 2, e70 (2013). DOI: 10.1038/lsa.2013.26.
Helicity dependent directional surface plasmon polariton excitation using a metasurface with interfacial phase discontinuity
Surface plasmon polaritons (SPPs) have been widely exploited in various scientific communities
ranging from physics
chemistry to biology
due to the strong confinement of light to the metal surface. For many applications
it is important that the free space photon can be coupled to SPPs in a controllable manner. In this Letter
we apply the concept of interfacial phase discontinuity for circularly polarizations on a metasurface to the design of a novel type of polarization-dependent SPP unidirectional excitation at normal incidence. Selective unidirectional excitation of SPPs along opposite directions is experimentally demonstrated at optical frequencies by simply switching the helicity of the incident light. This approach
in conjunction with dynamic polarization modulation techniques
opens gateway towards integrated plasmonic circuits with electrically reconfigurable functionalities.
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