Extremely Small and Incredibly Fast Microscopy: 1 nm and 10 us dynamics in concentrated colloidal suspensions

Recently we developed PERI, a technique for locating colloidal sphere's positions and radii to within 1 nm from ordinary light microscopy images. PERI provides unprecedented access to the physics of colloidal suspensions at small length scales. We use this for high precision measurements of the pair-correlation function g(r) and colloidal interactions at 1-nm distances. Finally, we couple PERI with high-speed brightfield light microscopy to examine fast dynamics of concentrated suspensions.