Issue |
EPL
Volume 122, Number 6, June 2018
|
|
---|---|---|
Article Number | 67002 | |
Number of page(s) | 5 | |
Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
DOI | https://doi.org/10.1209/0295-5075/122/67002 | |
Published online | 25 July 2018 |
Dielectric meta-walls for surface plasmon focusing and Bessel beam generation
1 Shanghai Engineering Research Center of Ultra-Precision Optical Manufacturing, Green Photonics and Department of Optical Science and Engineering, Fudan University - Shanghai 200433, China
2 State Key Laboratory of Surface Physics and Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Fudan University - Shanghai 200433, China
3 Collaborative Innovation Center of Advanced Microstructures - Nanjing 210093, China
4 State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences - Changchun 130033, China
(b) sls@fudan.edu.cn
Received: 4 June 2018
Accepted: 3 July 2018
Freely tailoring the wavefronts of surface plasmon polaritons (SPPs) is a central goal in plasmonics, but the conventional approaches exhibit low efficiencies and/or require bulky devices. Here, we propose to utilize ultrathin dielectric meta-walls placed vertically on a plasmonic metal to efficiently reshape the wavefront of a launched SPP beam. Based on such a strategy, we experimentally demonstrate two effects in the microwave regime, namely focusing and Bessel beam generations of spoof SPPs. Near-field scanning measurements are in excellent agreement with full wave simulations. This work can stimulate research in many applications related to SPP manipulations, such as enhanced nonlinear effect, nano-particle trapping, and so on.
PACS: 78.67.Pt – Multilayers; superlattices; photonic structures; metamaterials / 42.79.-e – Optical elements, devices, and systems / 73.20.Mf – Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)
© EPLA, 2018
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