An Au nanofin array was designed and fabricated for in a microscale optical retarder with high transmittance at visible wavelengths. The array was designed on the basis of the theory of waveguides. The adopted nanocoating process realized a high aspect ratio Au structure with a period of 400 nm and a height of 800 nm. The transmittance of transverse magnetic polarized light at visible to near-infrared wavelengths exceeded 40% and a retardation of 170° was achieved at 633 nm.

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