Our research develops nanoscale spectroscopic imaging techniques with sub 10 nm spatial resolution through deep integration of scanning probe microscopy and infrared optics. The spectroscopy and chemical imaging at < 10 nm allow access to the nanoscale phenomena that are not possible for traditional diffraction-limited spectroscopy.
The materials that we are interested in are polymers, plasmonic/polaritonic materials, and photovoltaic materials. We hope to unravel the mysteries at the nanoscale with the tools that are developed by our group.
Below are methods that we have developed.
Peak force infrared microscopy (PFIR)
Ultra-broadband light source for Scattering-type scanning near-field optical microscopy
Scattering-type scanning near-field optical microscopy (s-SNOM) is a microscopy based on linear light scattering. The bandwidth of the light source determines its frequency coverage. Current broadband infrared lasers from difference frequency generations are expensive. Here we developed a laser-driven plasma source that provides wide frequency coverage, high brilliance, spatial coherence, and low cost for s-SNOM. For more information, see our recent publication in ACS Photonics.
Scattering-type scanning near-field optical microscopy with low-repetition-rate pulsed light source through phase-domain sampling