Revealing nanoscale secrets through innovations in scanning probe microscopy
Microscopy opens many possibilities for understanding the composition, organization, and interaction of inhomogeneous materials. In our group, we develop spectroscopic microscopy below the optical diffraction limit to study macromolecules, heterogeneous materials, and nanostructures in order to decipher their chemical, electrical, and mechanical properties.
One challenge of optical microscopy is the diffraction limit of light, which is approximately a half of the wavelength. Nano-materials often have features smaller than the diffraction limit that is not resolvable by traditional optical microscopy. To overcome this challenge, we work on two types of super-resolution infrared microscopies that combines atomic force microscopy with laser radiations:
We are also interested in developing and refining other modalities of atomic force microscopy through instrumentation. For example, we have developed the Pulsed force Kelvin probe force microscopy (PF-KPFM)to map the surface potentials with < 10 nm spatial resolution under ambient conditions.