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.

J. Synchrotron Radiat.

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.