Pinholes with diameters down to 4 µm have been made in gold plates of a few hundred µm thickness. The fabrication method used is based on a casting technique. The pinholes are well suited for the collimation of (hard) X-rays from a synchrotron radiation source.

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Journal J. Synchrotron Radiat.
Citation
van der Veen, J. F, Riemersma, A. J, Schlatter, H, Abernathy, D. L, & Grobel, G. (1997). Casting technique for the fabrication of pinholes for x-ray radiation. J. Synchrotron Radiat., 4, 64–66.