The MIT team unveiled a method they call “discrete grid imaging technique” (DIGIT), which combines optical super-resolution imaging with prior knowledge of a material’s atomic lattice to resolve individual atoms, tells MIT News. Until now, optical microscopes were unable to discern atomic positions because atoms are much smaller than the wavelengths of visible light. Electron microscopes can do it, but require high-energy beams and vacuum conditions.
With DIGIT, researchers first collect optical images of quantum emitters or atom-substitutions (for example, silicon atoms replacing carbon in diamond). Then they overlay a model of the material’s atomic lattice, the “seating chart” of atoms, and apply statistical computing to determine the most probable exact positions of atoms. In experiments on diamond with silicon substitutions, the technique achieved a localization precision of 0.178 angstroms, better than most optical methods and approaching electron-microscope precision.
This capability opens possibilities across materials science: it could enable mapping of defects and impurities in semiconductors or superconductors, inform quantum‐device fabrication by placing quantum emitters in precise lattice sites, and extend to biological crystalline structures. One strength of DIGIT is its applicability to ambient or less extreme imaging conditions compared with electron microscopy. However, it still relies on knowing the lattice structure ahead of time, and its generalization to amorphous or non-crystalline materials may be limited.
For engineers and materials specialists, this means a sensor‐agnostic way to tie optical imaging back to atomic-scale geometry. The ability to localize atoms not just regionally but at specific lattice positions could accelerate precision manufacture of nanoscale devices, quantum sensors, and advanced materials. To sum up, DIGIT brings optical microscopy a step closer to atomic-resolution mapping, and that shift may reshape how we inspect, design, and control materials.