Figure 3 (IMAGE)

Columbia University School of Engineering and Applied Science

Figure 3

Caption

Top row: (Left) Illustration showing the operation of a three-function metalens doublet. The doublet is able to generate three distinct focal patterns (two focal lines orthogonal to each other and a star-shaped focal spot) at three different wavelengths, while staying transparent at other wavelengths. The doublet is composed of a quasi-radial metalens as a diverging element and a dual-function cylindrical metalens as a converging element. (Middle) Optical images of the quasi-radial metalens and the dual-function cylindrical metalens. (Right) SEM images showing the corners of the quasi-radial metalens and the dual-function cylindrical metalens. Bottom row: A series of 2D far-field scans showing the three focal patterns at l=1,424 nm, 1,492 nm, and 1,626 nm and minimal wavefront shaping over the rest of the spectrum.

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Nanfang Yu, Stephanie Malek, Adam Overvig/Columbia Engineering

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Please credit as: Nanfang Yu, Stephanie Malek, Adam Overvig/Columbia Engineering

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