Date:Thursday, December 4, 2025

Time: 12:30 PM to 1:45 PM

Location:  PAIS, Room 2540 and Zoom

Speaker: 

Dr. Masaru Kuno
1University of Notre Dame, Department of Chemistry and Biochemistry, Notre Dame, IN 46556
2University of Notre Dame, Department of Physics and Astronomy, Notre Dame, IN 46556

Abstract:

This talk will describe recent work we have conducted to develop a  superresolution, mid-infrared absorption microscopy. Called infrared photothermal heterodyne imaging (IR-PHI), the technique is a new superresolution microscopy approach that offers a mid-infrared spatial resolution of order 300 nm which is significantly below the mid-infrared diffraction limit. IR-PHI has been demonstrated on a number of model systems including individual polymer nanoparticles and perovskite thin films. More recent work we have conducted has introduced a widefield modality to the technique. The new IR-PHI variant is called widefield IR-PHI (wIR-PHI) and is capable of large area hyperspectral imaging and spectroscopy. The technique also has a temporal resolution of approximately 100 ns, enabling it to monitor transient species. In whole, these photothermal-based superresolution techniques open the door to highly sensitive and chemically specific measurements of local material properties.