High-speed cameras are becoming more widely used to study the fast mechanical deformation of materials caused by, for example, bullet impacts and blast waves. However, typical high-speed cameras are still insufficient at limiting motion blur to below optical resolution (~100 nanometers). The Nano-Engineering Laboratory has worked with a laser-based ultrafast imaging system and a laser-based mechanical deformation system to investigate the fast mechanical deformation of various materials ranging from Kevlar to nanomaterials to brain tissue. As our imaging system is based on light pulses shorter than one picosecond, an ultrafast temporal resolution, equivalent to trillions of frames per second, can be achieved. In this talk, I will present how the ultrafast imaging system works and what opportunities emerge from the novel mechanical characterization tool.
Jae-Hwang Lee has been an Assistant Professor in the Department of Mechanical and Industrial Engineering at the University of Massachusetts Amherst since 2014. He received a PhD degree in 2006 from Iowa State University in Condensed Matter Physics for 3D photonic crystals and their thermal applications. During his postdoctoral study at the Institute for Soldier Nanotechnologies at MIT, he focused on the mechanical deformation of multi-phase periodic nanomaterials. Afterwards, he worked as a research scientist at the Richard Smalley Institute at Rice University until 2014.