Journal
OPTICS LETTERS
Volume 45, Issue 18, Pages 5258-5261Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.401782
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Funding
- National Natural Science Foundation of China [11774053]
- Natural Science Foundation of Jiangsu Province [BK20181263]
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The Pancharatnam-Berry (PB) phase is generally utilized. to realize a single wavelength spin-dependent function or dual-wavelength functions but operating only in one spin state. A dual-wavelength multifunctional metasurface relying on both spins has been rarely designed due to the rather complicated degrees of freedom to be considered. In this Letter, both dynamic and PB phases are adopted, instead of a pure PB phase, to propose a multiplexing metasurface that can independently and simultaneously manipulate left-and right-handed circularly polarized incidences at dual wavelengths. It is demonstrated experimentally as well as numerically that such spin-dependent dual-wavelength metalenses can make circularly polarized incidences of different wavelengths split into and focus at multi-dimensional positions. Our work demonstrates a new avenue in designing spin-dependent dual-wavelength multifunctional optical devices. (C) 2020 Optical Society of America
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