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Fig. 4 | Nanoscale Research Letters

Fig. 4

From: Batch Fabrication of Broadband Metallic Planar Microlenses and Their Arrays Combining Nanosphere Self-Assembly with Conventional Photolithography

Fig. 4

Experimental setup for characterizing the optical focusing performance of microlenses and their arrays. A 532-nm continuous-wave (CW) laser is expanded via a telescope in order to obtain a homogeneous beam. Passing through the microlens, the transmitted speckle pattern is collected by a microscope objective and measured by a CCD

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