Bulletin of the American Physical Society
Fall 2019 Meeting of the Ohio-Region Section and the Michigan Section of the American Association of Physics Teachers
Volume 64, Number 15
Friday–Saturday, October 11–12, 2019; Flint, Michigan
Session D01: Saturday Plenary Talks |
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Chair: Corneliu Rablau, Kettering University Room: Kettering University Academic Building McKinnon Theater |
Saturday, October 12, 2019 10:10AM - 11:10AM |
D01.00001: The Group-IV Approach to Silicon Photonics Invited Speaker: Greg Sun Silicon-based photonic devices such as emitters and detectors have long been desired owing to the possibility of monolithic integration of photonics with high-speed Si electronics and the aspiration of broadening the reach of Si technology by expanding its functionalities well beyond electronics. To overcome the intrinsic problem of bandgap indirectness in the group-IV semiconductors of Si, Ge, and SiGe alloys, a new group-IV material platform silicon-germanium- tin alloy (SiGeSn) has been investigated, featuring compatibility with current CMOS process, capability of monolithic integration on Si, and the tunable bandgap allowing the optoelectronic devices operation covers broad wavelength in near- and mid-infrared ranges. For the past decade, plenty of promising results have been reported, such as GeSn lasers based on direct bandgap GeSn alloys, GeSn light emitting diodes (LEDs) and detectors operating in 2~3 µm. With tremendous novel electrical, optical, and mechanical properties, the newly developed GeSn devices could dramatically change the landscape of future microelectronics and photonics. In this plenary talk, I will present the latest development in photonic devices based on such a group-IV material system including infrared photodetectors, focal plane arrays, light emitting diodes, and optically pumped lasers. In addition, I will also talk about a more futuristic approach with the SiGeSn system for the development of THz quantum cascade lasers that can be potentially integrated on Si substrate. [Preview Abstract] |
Saturday, October 12, 2019 11:10AM - 12:10PM |
D01.00002: Light plus Sound: Photoacoustic Imaging and Treatment Invited Speaker: Xueding Wang Photoacoustic imaging (PAI), also referred to as optoacoustic imaging, is an emerging biomedical imaging technology that is noninvasive, nonionizing, with high sensitivity, satisfactory imaging depth and good temporal and spatial resolution. Like conventional optical imaging, PAI presents the optical contrast which is highly sensitive to molecular conformation and biochemical contents of tissues and can aid in describing tissue metabolic and hemodynamic changes. Unlike conventional optical imaging, the spatial resolution of PAI is not limited by the strong light diffusion but instead determined by the measurement of light- generated ultrasonic signals. As a result, the resolution of PAI is parallel to high-frequency ultrasonography. At the University of Michigan School of Medicine our research has been focused on clinical applications of PAI, including arthritis, cancer, liver conditions, Crohn’s disease, and eye diseases. In this talk, I will introduce some of our recently development of PAI technologies, including 1) development of point-of-care PAI system for human inflammatory arthritis, and 2) development of quantitative PAI for evaluating histological micro features and microenvironment of cancer. I will also present our recent development of a photoacoustic based anti-vascular technology named photo-mediated ultrasound therapy (PUT). Using a combination of a low intensity laser concurrently with ultrasound, PUT can noninvasively remove micro vessels without damaging surrounding biological tissue, and shows potential to the treatment of a variety of diseases associated with neoangiogenesis, such as age-related macular degeneration and diabetic retinopathy, as well as port-wine stain and cancer. [Preview Abstract] |
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