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ECE Colloquium Series – Prof. Nathan Youngblood

February 27 @ 3:30 pm - 5:00 pm

As part of the *Eleanore Hale Wilson Lecture Series, ECE is proud to present:

Phase-Change Photonics for All-Optical Memory, Computation, and Beyond

Prof. Nathan Youngblood

University of Pittsburgh

Host: Prof. Sang-Hyun Oh


Phase-change chalcogenides (such as AgInSbTe and Ge2Sb2Te5) have been used for many years in optical storage (rewritable CDs/DVDs) owing to their high optical contrast and long-term stability. However, only recently has a fully integrated photonic device based on these materials been demonstrated. This approach not only enables non-volatile optical memory on-chip, but also allows multilevel data storage with low drift, low switching energy, and high speed operation. The first part of this talk will cover new innovations in phase-change, non-volatile photonic memory including efficient multilevel programming schemes, optically-tunable volatility, and mixed-mode plasmonic memory. The second half of the talk will focus on using this photonic memory—together with wavelength division multiplexing and “in-memory” computing techniques—to enable high-speed multiply-and-accumulate operations for applications in machine learning.


Nathan Youngblood is an Assistant Professor of Electrical and Computer Engineering at the University of Pittsburgh. As a postdoctoral researcher at the University of Oxford from 2017 to 2019, he developed phase-change photonic systems and devices for non-von Neumann computing architectures. In 2016, he received a PhD in Electrical Engineering from the University of Minnesota where his research focused on integrating 2D materials with silicon photonics for optoelectronic applications. His research interests include: photonic devices and architectures for machine learning; waveguide-integrated nanoplasmonics for high density biosensing; and 2D materials for high performance optoelectronics.

*Established in 2009, the Eleanore Hale Wilson Fund supports engineering field leaders for travel to Minnesota to share their expertise and discoveries with University of Minnesota graduate students, faculty, and alumni. The fund also supports the receptions held in honor of each speaker.



February 27
3:30 pm - 5:00 pm


Keller Hall 3-210
200 Union St SE
Minneapolis, MN 55455 United States
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