Euan McLeod,
Associate Professor of Optical Sciences

Wyant College of Optical Sciences

Tuesday, October 26, 2021 | 2:17 p.m. 

Title: “Assembly of 3D micro- and nano-photonic structures from building blocks”

Abstract:Three-dimensional nanofabrication of complex structures out of multiple materials remains a challenge. Better approaches can enable new materials, microfluidic biosensors, and photonic devices. Here I present an optical positioning and linking (OPAL) approach for assembling 3D structures out of large numbers of multi-material microscale and nanoscale building blocks. This optical tweezers-based approach provides a route for fabricating structures that were previously infeasible, including precision augmentation of microscale optical devices. Novel computational approaches that we have developed for designing new photonic devices based on the assembly of discrete building blocks will also be discussed.

Bio: Euan McLeod wp.optics.arizona.edu/emcleod is an Associate Professor in the Wyant College of Optical Sciences at the University of Arizona (UA). He is also an Associate Professor of the UA BIO5 Institute and an Affiliate Member of the UA Cancer Center. Euan received his B.S. from Caltech and his Ph.D. from Princeton University. He was a postdoc in Electrical Engineering and Bioengineering at UCLA, as well as a postdoc in Applied Physics at Caltech. Euans background and interests lie at the intersection of optics, nanoscience, and soft bio-materials science. He has published more than 35 papers on these topics in peer-reviewed journals and has been awarded 5 patents, with major contributions in the areas of high-speed varifocal lenses based on acoustic modulation, lensfree holographic imaging of nanoparticles, viruses, and biomarkers; and the use of optical tweezers in fabricating micro- and nano-structured materials. Euan is a Senior Member of SPIE and Optica. He won an NSF CAREER award in 2021.

Pavel Polynkin,
Research Professor of Optical Sciences

Wyant College of Optical Sciences

Tuesday, October 26, 2021 | 1:30 p.m. 

Title: “Intense, short-pulse laser-matter interactions laboratory”

Abstract: I will discuss the experimental facilities and research projects at the ultrafast laser laboratory at the College of Optical Sciences. The major directions of our work are: the nonlinear propagation and self-channeling of powerful laser beams in gases and solids, ionization of matter with laser pulses, laser micromachining, and construction of short-pulse laser systems based on solid-state and fiber gain media.

Bio: Pavel Polynkin wp.optics.arizona.edu/ppolynkin/ received his MS degree in Applied Physics and Mathematics from Moscow Institute of Physics and Technology in 1995 and his PhD degree in Electrical Engineering from Texas A&M University in 2000. His graduate research was on quantum coherence effects in atoms and molecules and on optical fiber sensors for precision measurements of rotation rates and electromagnetic fields. From graduation till 2003, he worked as an optical engineer in the telecommunications industry in Silicon Valley, California. Since 2003, he has been with the College of Optical Sciences at the University of Arizona, where he is currently a Research Professor. Dr. Polynkin’s recent research has been on ultrafast light-matter interactions, strong-field ionization, laser filamentation, and related phenomena. He is also interested in the development of new short-pulse laser sources based on fiber and solid-state gain media. He has co-authored 70 peer-reviewed publications and 11 US patents.

Travis Sawyer,
Assistant Professor of Optical Sciences

Wyant College of Optical Sciences

Tuesday, October 26, 2021 | 11:00 a.m. 

Title: “Advancing toward early detection and intraoperative localization of gastrointestinal cancer using multiphoton and polarization imaging”

Abstract: Gastrointestinal neuroendocrine tumors including gastrinomas, represent a growing class of cancer. There is a strong need for intraoperative localization to facilitate diagnosis and treatment. Multiphoton microscopy (MPM) is a promising technique for label-free tissue imaging to probe metabolism and other biochemical markers that are altered with cancer. Polarization imaging provides sensitivity to microstructural changes due to disease, which complements MPM features in a multimodal strategy. I will present our ongoing work to apply MPM and polarization imaging to detect imaging markers unique of gastrinoma, paving the way toward developing intraoperative imaging techniques.

Bio: Travis Sawyer wp.optics.arizona.edu/tsawyer/ is an Assistant Professor of Optical Sciences and Health Sciences. He received his BS in Optical Sciences from the UA (2017) before attending the University of Cambridge to receive his MPhil in Physics (2018). He then returned to the UA pursue his PhD in Optical Sciences (2021) where he focused on developing novel imaging techniques for ovarian cancer detection. After graduating, he joined the faculty at the College of Optical Sciences to establish the Biomedical Optics and Optical Measurement Lab. His research interests include gastrointestinal cancer detection, where he develops screening devices incorporating optical coherence tomography, fluorescence imaging, and other novel imaging modalities, with a focus on image analysis through machine learning techniques. Previously, he started a company developed visual recognition software for detailed image capture, enabling discoveries in astronomy, art preservation, and the biomedical sciences.