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Fig. 4 | Nanoscale Research Letters

Fig. 4

From: Broadband Metallic Planar Microlenses in an Array: the Focusing Coupling Effect

Fig. 4

a The line-scanning profiles of light intensity across the focal spots of the 2 × 2 microlens array with the spacing of a = 0, 2, 4 μm, accompanied by the result of the isolated microlens. The coupling point E for the case of a = 0 μm can be clearly observed. b The derived focal length and FWHM of the focal spots as the spacing changes. The blue and green dashed lines represent the focal length and FWHM of the isolated microlens

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