= Janos Kirz
{c}
{tag=Physicist}
{wiki}
<Janos Kirz> developed <X-ray> imaging methods using <zone plates>. His joint technical account with <David Attwood> explains how <diffraction> replaces ordinary refraction in a small focusing optic. Replacing absorbing zones by zones that shift the <wave phase> can raise the focusing efficiency. Their account also connects finite illumination bandwidth to chromatic blurring: many zones improve focusing only if the incident <X-rays> occupy a sufficiently narrow range of <wavelengths>.<Zone Plates by Janos Kirz and David Attwood>[Section 4.4, phase-shifting zones and the bandwidth condition N less than wavelength divided by spectral width]{ref}
\Image[https://commons.wikimedia.org/wiki/Special:Redirect/file/Janos_kirz_in_2025_02a.jpg?width=260]
{title=Portrait of <Janos Kirz> in 2025}
{description=Via Wikimedia Commons; the linked file page provides image credits and usage information.}
{source=https://commons.wikimedia.org/wiki/File:Janos_kirz_in_2025_02a.jpg}
{width=260}
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