Figure 1 | Working principle of the phyllotaxis-inspired vortex nanosieve and demonstration of the free-space phyllotaxis-inspired vortex nanosieve (IMAGE)

Light Publishing Center, Changchun Institute of Optics, Fine Mechanics And Physics, CAS

Figure 1 | Working principle of the phyllotaxis-inspired vortex nanosieve and demonstration of the free-space phyllotaxis-inspired vortex nanosieve

Caption

a, A “Golden-ratio” phyllotaxis pattern producing “Fibonacci” OAM series inspires us to design phyllotaxis-alike vortex nanosieves. In the Fresnel region, the diffractive pattern of a Vogel spiral nanosieve with 936 florets is simulated and mode coefficients are calculated. The corresponding results reveal the link between phyllotaxis patterns and optical vortices, thus inspiring us to design phyllotaxis-alike vortex nanosieves. b, Free-space phyllotaxis-inspired vortex nanosieve generating four different on-axis optical vortices simultaneously in free-space. Left panel: The red, purple, green, and blue solid circles denote the four different motifs concealed in the free-space phyllotaxis-inspired vortex nanosieve structure. Right panel: The four different sets of concealed spirals and their relevant simulated Fresnel diffraction intensity profiles. c, A top-view scanning electron microscope (SEM) image of the sample. d, The measured free-space Fresnel diffraction intensity profiles upon 633nm, 532 nm, and 445 nm illumination, respectively.

Credit

by ZhongweiJin, David Janoschka, Junhong Deng, Lin Ge, Pascal Dreher, Bettina Frank, Guangwei Hu, Jincheng Ni, Yuanjie Yang, Jing Li, Changyuan Yu, Dangyuan Lei, Guixin Li, Shumin Xiao, Shengtao Mei, Harald Giessen, Frank Meyer zu Heringdorf, Cheng-Wei Qiu

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