Near-field imaging of surface-plasmon vortex-modes around a single elliptical nanohole in a gold film

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作者
Claudia Triolo
Salvatore Savasta
Alessio Settineri
Sebastiano Trusso
Rosalba Saija
Nisha Rani Agarwal
Salvatore Patanè
机构
[1] University of Messina,Dipartimento di Scienze Matematiche e Informatiche, Scienze Fisiche e Scienze della Terra
[2] Cluster for Pioneering Research,Theoretical Quantum Physics Laboratory
[3] RIKEN,Nano
[4] CNR-IPCF,imaging and Spectroscopy Laboratory, Faculty of Science
[5] Istituto per i Processi Chimico-Fisici del CNR,undefined
[6] University of Ontario Institute of Technology,undefined
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Scientific Reports | / 9卷
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摘要
We present scanning near-field images of surface plasmon modes around a single elliptical nanohole in 88 nm thick Au film. We find that rotating surface plasmon vortex modes carrying extrinsic orbital angular momentum can be induced under linearly polarized illumination. The vortex modes are obtained only when the incident polarization direction differs from one of the ellipse axes. Such a direct observation of the vortex modes is possible thanks to the ability of the SNOM technique to obtain information on both the amplitude and the phase of the near-field. The presence of the vortex mode is determined by the rotational symmetry breaking of the system. Finite element method calculations show that such a vorticity originates from the presence of nodal points where the phase of the field is undefined, leading to a circulation of the energy flow. The configuration producing vortex modes corresponds to a nonzero total topological charge (+1).
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