Hannover 2013 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 43: Poster II
Q 43.56: Poster
Mittwoch, 20. März 2013, 16:00–18:30, Empore Lichthof
Dual-polarity metalens based on plasmonic nanoantennas — Xianzhong Chen1, Lingling Huang1,2, •Holger Mühlenbernd3, Guixin Li4, Benfeng Bai2, Qiaofeng Tan2, Guofan Jin2, Cheng-Wei Qiu5, Shuang Zhang1, and Thomas Zentgraf3 — 1School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, UK — 2State Key Laboratory of Precision Measurement Technology and Instruments, Tsinghua University, Beijing 100084, China — 3Department of Physics, University of Paderborn, Warburger Straße 100, D-33098 Paderborn, Germany — 4Department of Physics, Hong Kong Baptist University, Hong Kong — 5Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore 117576, Singapore
The refractive index profile and surface topography dictate the functionality of a lens. Therefore the properties of the lenses are fixed during the fabrication process and cannot be altered. Here, ultrathin metalenses based on plasmonic nanoantennas can provide a solution. For such metalenses it is necessary to use a more generalized form of Snell’s law, which contains an additional phase-change due to the plasmonic resonators. By controlling the position of the plasmonic resonators, it is possible to control the spatial phase-change of the incident beam. With this we are able to design ultrathin lenses with dispersionless behavior and specific focal length. Furthermore, we will show that the phase change depends on the polarization state of the incoming light. This opens the possibility to design lenses which can be switched from convex to concave.