Metalens for coaxial double wavelength focusing

Jiannong Chen; Baodong Wang; Linwei Zhu; Jing Han; Qinfeng Xu

doi:doi:10.3788/COL202018.042401

Chinese Optics Letters, 2020, 18 (4): 042401, Published Online: Mar. 18, 2020

Metalens for coaxial double wavelength focusing Download： 733次

Jiannong Chen ^*Baodong Wang Linwei Zhu Jing Han Qinfeng Xu

Author Affiliations

School of Physics and Opto-Electronics Engineering, Ludong University, Yantai 264025, China

Figures & Tables

Fig. 1. Design scheme of the metalens for coaxial double wavelength focusing. (a) The phase modulation for the laser with a wavelength of $λ_{1}$ ; (b) the phase modulation of a vortex with a topological charge of one; (c) the phase modulation combining (a) and (b) for the laser with a wavelength of $λ_{2}$ ; (d) the meta-molecular structure unit.

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Fig. 2. Schematic diagram of the designed metalens for coaxial double wavelength focusing.

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Fig. 3. FDTD-simulated focusing spot for designed metalens. (a) The circular solid spot for the first laser with $λ_{1}$ ; (b) the doughnut-shaped focusing spot for second laser with $λ_{2}$ .

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Fig. 4. Local magnified SEM image of the fabricated metalens.

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Fig. 5. Experimental setup for verifying the functionality of the designed metalens.

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Fig. 6. Experimental result that is captured by a CCD camera.

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Jiannong Chen, Baodong Wang, Linwei Zhu, Jing Han, Qinfeng Xu. Metalens for coaxial double wavelength focusing[J]. Chinese Optics Letters, 2020, 18(4): 042401.

Metalens for coaxial double wavelength focusing Download： 733次

Fig. 2. Schematic diagram of the designed metalens for coaxial double wavelength focusing.

Fig. 3. FDTD-simulated focusing spot for designed metalens. (a) The circular solid spot for the first laser with $λ_{1}$ ; (b) the doughnut-shaped focusing spot for second laser with $λ_{2}$ .

Fig. 4. Local magnified SEM image of the fabricated metalens.

Fig. 5. Experimental setup for verifying the functionality of the designed metalens.

Fig. 6. Experimental result that is captured by a CCD camera.

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Metalens for coaxial double wavelength focusing Download： 733次

Fig. 2. Schematic diagram of the designed metalens for coaxial double wavelength focusing.

Fig. 3. FDTD-simulated focusing spot for designed metalens. (a) The circular solid spot for the first laser with λ1; (b) the doughnut-shaped focusing spot for second laser with λ2.

Fig. 4. Local magnified SEM image of the fabricated metalens.

Fig. 5. Experimental setup for verifying the functionality of the designed metalens.

Fig. 6. Experimental result that is captured by a CCD camera.

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Fig. 3. FDTD-simulated focusing spot for designed metalens. (a) The circular solid spot for the first laser with $λ_{1}$ ; (b) the doughnut-shaped focusing spot for second laser with $λ_{2}$ .