Abstract

In this seminar, I will describe recent technological advancements in our laboratory to translate the terahertz spectroscopy technology from the laboratory to industrial and clinical applications. At the core of these technological breakthroughs is our new portable handheld spectral reflection (PHASR) scanners, that can form full spectroscopic images of a 1-inch scenery in about 1-2 seconds. To achieve this high scan speed, we will discuss several electro-optic sampling techniques that result in one order of magnitude improvement in THz trace acquisition rate. Additionally, I will introduce a new variation of the celebrated terahertz time-domain spectroscopy (THz-TDS) technique, invented in our group, dubbed the Terahertz Time-Domain Polarimetry (THz-TDP), which allows for real-time detection of the polarization direction of the terahertz electric-field without the need for any external polarizers. We will utilize these new scanners to measure the back-scattered THz speckle fields in a variety of applications and explore Mueller matrix polarimetry of industrial and biological targets. Finally, we will explore several physics-based machine learning models to classify tissue samples based on their THz spectral signatures, including Shannon entropy and double Debye dielectric relaxation models of the skin.

Bio:

Dr. Arbab is an associate professor of Biomedical Engineering at Stony Brook University with affiliate appointments in the Physics and Astronomy, Electrical Engineering and Ophthalmology Departments. He received his PhD in Electrical Engineering and Nanotechnology in 2012 from the University of Washington (UW). He was then awarded the inaugural Applied Physics Laboratory (APL) Director's Distinguished Post-Doctoral Fellowship, designed as a path to independence for young investigators. He held a senior research scientist position at the APL-UW until September 2016, when he moved to the Department of Biomedical Engineering at Stony Brook University (SBU). His research at SBU has continued to focus on the invention and application of portable and handheld terahertz scanners for various imaging applications under funding support from the NIH, NSF, DOD and industry. His research interests also include millimeter-wave polarimetry, non-linear and ultrafast optics, and modeling the propagation and scattering of terahertz waves in biological tissue.

Zoom Meeting Link: https://unt.zoom.us/j/88560326656