Nitay Ben-Shachar

In the presence of an applied magnetic field, the viscosity tensor of electron flows exhibits an off-diagonal component. This Hall or odd viscosity has recently been measured in high-mobility devices. It is known that use of the hydrodynamic theory to extract the Hall viscosity from Hall resistivity measurements strongly overestimates its value.

Whispering gallery mode (WGM) resonances in dielectric microspheres are very sensitive to their size and environment, which can be used for sensing but also as an indirect proxy to determine their size. By coating them with suitable fluorescent dyes and using fluorescence microscopy, we show that the WGM resonances of individual microspheres in solution can be easily studied with a high throughput. Brownian motion ensures that a representative sample is probed over time in the scattering volume.