O.M. Stewart Colloquium

Every Monday, at 4 PM the department of Physics and Astronomy hosts the O. M. Stewart Colloquium, in rm 120, Physics Bldg.

Refreshments are served starting at 3:30 PM in the Physics Library (rm 223, second floor).

Date	Speaker/Title/Abstract
2/18/26	Dr. Elham Ghadiri, Wake Forest University Advancing Ultrafast Optical Microscopy Imaging to Visualize Nanoscale Photophysics Abstract: Key functional phenomena - from vision and photosynthesis to advanced optoelectronics and photonics - originate from ultrafast microscopic photophysical dynamics. Macroscopic properties emerge from electronic and structural evolution, often occurring on ultrafast time scales of femtoseconds. Ultrafast spectroscopy allows us to directly resolve these processes. My research establishes optical pump–probe microscopy as a powerful, highly sensitive ultrafast imaging platform. I will discuss our latest advances in ultrafast pump-probe microscopy, which enable us to image the system in femtoseconds and to visualize the photophysical processes in complex systems with femtosecond time resolution and sub-micrometer spatial resolution. I will discuss our implementation of ultrafast time-resolved pump-probe transient absorption microscopy-spectroscopy for highly sensitive photophysical and photochemical analysis of energy conversion materials, as well as bioinspired and biocompatible optoelectronic material systems prepared in our lab. N/B: Please note that this event is not being held on our usual colloquium day, which is Monday.
2/5/24	Dr. Christopher Howk, Dept. of Physics and Astronomy, University of Notre Dame O.M. Stewart Colloquium

Date

Speaker/Title/Abstract

2/18/26

Dr. Elham Ghadiri, Wake Forest University
Advancing Ultrafast Optical Microscopy Imaging to Visualize Nanoscale Photophysics

Abstract: Key functional phenomena - from vision and photosynthesis to advanced optoelectronics and photonics - originate from ultrafast microscopic photophysical dynamics. Macroscopic properties emerge from electronic and structural evolution, often occurring on ultrafast time scales of femtoseconds. Ultrafast spectroscopy allows us to directly resolve these processes.

My research establishes optical pump–probe microscopy as a powerful, highly sensitive ultrafast imaging platform. I will discuss our latest advances in ultrafast pump-probe microscopy, which enable us to image the system in femtoseconds and to visualize the photophysical processes in complex systems with femtosecond time resolution and sub-micrometer spatial resolution. I will discuss our implementation of ultrafast time-resolved pump-probe transient absorption microscopy-spectroscopy for highly sensitive photophysical and photochemical analysis of energy conversion materials, as well as bioinspired and biocompatible optoelectronic material systems prepared in our lab.

N/B: Please note that this event is not being held on our usual colloquium day, which is Monday.

2/5/24

Dr. Christopher Howk, Dept. of Physics and Astronomy, University of Notre Dame
O.M. Stewart Colloquium