Students

Maryam Baker, Ph.D. Student

Wyant College of Optical Sciences
Advisor: Euan McLeod

Tuesday, October 26, 2021 | 2:38 p.m.

Title: “Computational methods for improved lens-free microscopy”

Abstract: Lens-free microscopy relies on computational methods to reconstruct an image from a diffraction pattern recorded on an image sensor. Lens-free microscopes often consist of only a light source, an object to image, and an image sensor, enabling these systems to be compact and cost-effective devices. These devices can also achieve sub-micron resolution over ultra-large fields of view, corresponding to the full size of the image sensor, which is useful for needle-in-a-haystack problems. One way the resolution of these systems can be improved is by using reconstruction methods that accurately account for scattering from sub-wavelength scale features. In this talk, I’ll describe simplified models we developed to describe scattering from sub-wavelength scale features to improve the speed and accuracy of reconstructed images from lens-free microscopes.

Bio: Maryam Baker is a 6th year PhD student in Euan McLeod’s Soft Nano-photonic Systems lab. She is interested in computational imaging and is currently working on methods for improving the resolving capabilities of lens-free systems.


Jacob Barker, Ph.D. Student

Wyant College of Optical Sciences
Advisor: Pavel Polynkin

Tuesday, October 26, 2021 | 2:04 p.m.

Title: “Construction of Terawatt-class laser system in long-wave infrared for strong-field research”

Abstract: I will present an on-going research project that aims at the construction of an ultrafast and ultraintense laser system with the center wavelength tunable in the range from 8 to 10 micrometers. This state-of-the-art laser source will enable various experiments on intense laser-matter interactions in the regimes that have been not accessible with conventional near-infrared ultrafast lasers.

Bio: Jacob Barker is a 3rd year PhD student under Dr. Pavel Polynkin. He is currently working on construction of a Terawatt-class laser system in the long-wave infrared and how to apply adaptive optics to strong-field science.


Charles Condos, Ph.D. Student

Wyant College of Optical Sciences
Advisor: Dalziel Wilson

Tuesday, October 26, 2021 | 1:51 p.m.

Title: “Chip-scale torsion resonators for precision measurement”

Abstract: Torsion resonators are widely used for precision measurements.  Recently we have realized a new class of nano-mechanical torsion resonators with ultra-high-quality factors, based on strained Si3N4 thin films. These devices open the door to macroscopic quantum experiments and chip-scale precision sensing.  As an example, I will show how optical deflection measurements can be used to resolve the rotation of a Si3N4 nanobeam with an imprecision smaller than it’s zero point motion.  I will also present a chip-scale gravimeter capable of detecting micro-g fluctuations of the local gravitational field, based on mass-loading a Si3N4 nanobeam to form a pendulum.

Bio: 2nd year PhD student with a B.S. in physics and applied mathematics


JJ Katz, Ph.D. Student

Wyant College of Optical Sciences
Advisor: Hong Hua

Tuesday, October 26, 2021 | 11:34 a.m.

Title: “Development of a Multi-Resolution Foveated Laparoscope”

Abstract: Laparoscopic minimally invasive surgery (MIS) is the gold standard for appendectomies, cholecystectomies, and numerous other surgical procedures. Compared to open surgery, laparoscopic MIS has demonstrated reduced post-operative pain, medical costs, recovery times, and hospital stays. Despite its many advantages, contemporary MIS is fundamentally limited in safety and efficiency by traditional laparoscopic imaging systems. Standard surgical laparoscopes suffer two main drawbacks. First, traditional laparoscopes exhibit a trade-off between instantaneous field of view (FOV) and spatial resolution, which can result in accidents occurring and going unnoticed outside of the FOV. Second, traditional laparoscopes are handheld devices that induce fatigue, non-ergonomic postures, limited ranges of motion, and increased dependence on effective surgical team communication. A multi-resolution foveated laparoscope (MRFL) with scanning and zooming capabilities was invented to address these issues and increase the safety and efficiency of MIS. This presentation discusses the development of the current MRFL prototype and provides details on the next generation MRFL.

Bio: Jeremy (JJ) Katz is a PhD Candidate at the University of Arizona’s College of Optical Sciences and a high school math and science teacher. He holds a BS in Optical Engineering and MS in Optical Sciences from the University of Arizona. His research specialties include lens design, optical engineering, and endoscopic systems with a focus on applications in surgical imaging. His email address is JJikatz@email.arizona.edu.


Elliott Kwan, Ph.D. Student

Wyant College of Optical Sciences
Advisor: Hong Hua

Tuesday, October 26, 2021 | 11:21 a.m.

Title: “Tri-aperture monocular laparoscopic objective for stereoscopic and wide field of view acquisition”

Abstract: This talk presents the optical design of a tri-aperture monocular laparoscopic objective that can acquire both stereoscopic views for depth information and a wide field of view (FOV) for situational awareness. The stereoscopic views are simultaneously captured via two separated apertures and a custom prism. Overlapping crosstalk between the stereoscopic views is diminished by incorporating a strategically placed vignetting aperture. Meanwhile, the wide FOV is captured via a central third aperture and provides greater peripheral awareness with 2x the stereoscopic FOV along the stereo baseline axis. We also demonstrate how the wide FOV provides a reference data set for stereo calibration, which enables absolute depth mapping in our manufacturable prototype.

Bio: Elliott Kwan is an optical engineering PhD candidate at OSC. Recently, he was a winner of Synopsys’ 2021 Robert S. Hilbert Memorial Optical Design Competition. His thesis research is in optical lens design, prototyping, and calibration of novel 3D laparoscopes. He received his BS in biomedical engineering from the University of California, Irvine and his MS in optical sciences from OSC.


Josh Magnus, Ph.D. Student

Wyant College of Optical Sciences
Advisor: Khanh Kieu

Tuesday, October 26, 2021 | 2:51 p.m.

Title: “Fiber Based Coherent Raman Microscopy and Spectroscopy”

Abstract: Coherent Raman scattering microscopy is a powerful tool that can be used for label free chemical contrast imaging. Coherent Raman scattering probes the vibrational modes of Raman active molecules, providing a unique Raman spectrum for identification of biological samples. We present a fiber-based laser system for coherent Raman imaging, using spectral focusing techniques. Our system uses coherent anti-stokes Raman scattering (CARS) and stimulated Raman scattering (SRS) for imaging. We are further developing our system, in collaboration with Accelerate Diagnostics Inc. for identification of bacterial samples.

Bio: Josh Magnus is a second year Ph.D. student at the James C. Wyant College of Optical Sciences. He is working in Prof. Khanh Kieu’s Ultrafast Fiber Lasers and Nonlinear Optics group. He received undergraduate degrees in Physics and Astrophysics from the University of Minnesota. His research interests are in developing novel fiber lasers for nonlinear imaging systems.


Khalid Omer, Ph.D. Student

Wyant College of Optical Sciences
Advisor: Meredith Kupinski

Tuesday, October 26, 2021 | 10:37 a.m.

Title: “Physics-Based Rendering: Simulated Mueller Matrix Imaging”

Abstract: Physics-based rendering (PBR) engines attempt to generate photorealistic images by mimicking light-matter interaction in a physically plausible way. PBR has become the standard rendering method in animation, gaming, and computer graphic research. More recently, PBR engines have incorporated the polarization of light into their pipelines. An area of interest for polarization-aware PBR engines is validating the accuracy of polarization-sensitive material models. This presentation shows the first reconstructed Mueller Matrix images using a simulated Mueller matrix imaging polarimeter. Simulated reconstructed Mueller matrix images are compared to measured results from the University of Arizona Polarization Lab’s RGB950, a Mueller matrix imaging polarimeter, at varying lighting/measuring configurations. Comparing measured and simulated Mueller matrix images with varying object geometry provide researchers an additional tool to validate polarized material models.

Bio:Khalid Omer received a B.S. in Optical Sciences and Engineering from the University of Arizona, USA, in 2018, with a minor in Physics. He is expected to graduate in Fall 2021 with his Ph.D. in Optical Sciences at the University of Arizona, Wyant College of Optical Sciences. His current research interest is in polarization imaging, object/scene recognition utilizing neural networks, polarimetric light scattering models, and polarimetric image rendering.


Kira Hart Shanks, Ph.D. Student

Wyant College of Optical Sciences
Advisor: Meredith Kupinski

Tuesday, October 26, 2021 | 10:11 a.m.

Title: “High altitude demonstration of a compact LWIR polarimeter for ice cloud measurements”

Abstract: High altitude ballooning is an attractive platform due to its relatively low cost and the ability to demonstrate prototype instruments under development for CubeSat deployment. One such instrument is the InfraRed Channeled Spectro-Polarimeter (IRCSP) developed at the University of Arizona as a part of the Submm-Wave and IR Polarimeters (SWIRP) project in collaboration with NASA Goddard Spaceflight Center. SWIRP targets the measurement of cold upper atmospheric clouds, motivating the adaptation of the IRCSP for high altitude ballooning. On August 30, 2021, the IRCSP flew on a NASA Columbia Scientific Balloon out of Fort Sumner, NM. The instrument was retrieved successfully and collected over 300 minutes of flight data, achieving a maximum float altitude of 32.9 km. Data retrieved during the flight demonstrate the feasibility of utilizing commercially available microbolometers in compact rapidly deployable LWIR radiometers for atmospheric and terrestrial remote sensing. In addition, the 2021 flight collected the first-ever down-viewing spectro-polarimetric measurements of clouds in the 8 – 12 micron bandwidth, motivating the continued pursuit of LWIR polarimetric data for the retrieval of cloud micro-physical properties.

Bio: Kira is a 5th year Ph.D. candidate in the Wyant College of Optical Science where her research focuses on the development of remote sensing instruments for climate science. Specifically, her dissertation project centers on the design, calibration, and deployment of an LWIR spectro-polarimeter for ice cloud monitoring. In 2020, she was selected for a Future Investigators in NASA Earth and Space Science and Technology (FINESST) award in Earth Science to support her remote sensing work. Prior to coming to Tucson, she received her B.S. in physics from UCLA in 2017 where she conducted microscopy research in the Ozcan Research Group.


Hayden Wisniewski, Ph.D. Student

Wyant College of Optical Sciences
Advisor: Brandon Chalifoux

Tuesday, October 26, 2021 | 10:24 a.m.

Title: “Lateral shift mapping metrology for X-ray telescope mirrors”

Abstract: Currently, high-resolution X-ray telescope mirrors, such as for the Lynx X-Ray Observatory concept, are measured using a Fizeau interferometer with a cylindrical null corrector. Uncertainties in the null wavefront directly couple into the surface measurement uncertainty, including the axial figure and cone angle variation. We extend the absolute surface metrology method of lateral shift mapping for measuring X ray telescope mirror segments. Lateral shift mapping involves laterally shifting the surface under test relative to the null to multiple positions. The null wavefront can be extracted from the difference between these shifted measurements, leaving only the surface under test. Accurately extracting quadratic terms of the surface under test requires measuring its tilt during shifting. We will show surface metrology results of optical flats measured by Fizeau-based lateral shift mapping with the required angle measured using an autocollimator and compare these results against a three-flat test. We will show how we plan to extend this method to conical X-ray telescope mirror metrology. The lateral shift mapping method reduces the uncertainty introduced by the cylindrical null, a critical step toward making high-resolution X-ray telescope mirrors.

Bio: Hayden Wisniewski is a fourth year PhD Candidate in the Lightweight Optics Lab (LOL) under Brandon Chalifoux. His research focuses on developing interferometric techniques for absolute surface metrology of X-ray telescope mirrors. He received a B.S. in Physics from Whitworth University. When not in lab deep under the Optics College, He can be found soaking up too much Arizona sun while rock climbing, mountain biking, and riding off-road motorcycles.


Hwang-Jye Yang, Ph.D. Student

Wyant College of Optical Sciences
Advisor: Amit Ashok

Tuesday, October 26, 2021 | 9:58 a.m.

Title: “Nanodentride based Optical PUFs for Security”

Abstract: Physical unclonable function (PUF) serves as their unique identity, which is an excellent candidate as a security key to replace the vulnerable electric encryption. The critical requirements of PUF are easy to evaluate but difficult to predict, simple to fabricate but hard to duplicate even if the manufacturing process is known. However, most of the PUFs are high cost and hard to fabricate since building a unique and random PUF is complicated. Here, we demonstrate a new optical PUF system that is low cost and easy setup to achieve the requirements. We employ this nano-structure material by coherent lights and detected the far-field distribution in the specular reflection direction. In this research, we utilize two different simulation methods to verify the pattern in the micro-scale and apply one of the methods to the global size in the normal incidence. We show how to set the threshold of the fractional Hamming distance in different challenges to determine the PUF is accepted or declined for the security application.

Bio: Hwang-Jye Yang is a Ph.D. candidate of James Wyant College of Optical Sciences. He received his B.S. in chemistry and M.S. in physics from the National Taiwan Normal University. After graduating, he joined the National Synchrotron Radiation Research Center to research gas phase spectroscopy and coherence anti-Stokes Raman scattering microscopy. His research interests include nanostructure electromagnetics simulation and imaging processing applied to the cryptographic authentication. Recently his work focuses on the X-ray images reconstruction and threatened material recognition by deep neural network.