= STED microscopy
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<Stefan Hell> was really excited by this as of 2023.
Instead of shining a light over the entire sample to saturate it, you illuminate just a small bit instead.
He was basically saying that this truly brings the resolution to the actual physical limits, going much much beyond 2014 Nobel prize levels.
\Image[https://web.archive.org/web/20230227073734im_/https://upload.wikimedia.org/wikipedia/commons/2/2b/STED_Mikroskop_PSFs.jpg]
{title=Illumination patterns for <STED microscopy>}
{source=https://upload.wikimedia.org/wikipedia/commons/2/2b/STED_Mikroskop_PSFs.jpg}