Northwestern Events Calendar


HEP Seminar: David Osterman: "Measuring Quasiparticle Diffusion in Superconducting Aluminum Films with a TES and Laser-Scanning Microscopy"

When: Monday, June 5, 2023
4:00 PM - 5:00 PM CT

Where: Technological Institute, F160, 2145 Sheridan Road, Evanston, IL 60208 map it

Audience: Faculty/Staff - Student - Post Docs/Docs - Graduate Students

Contact: Joan West   (847) 491-3645

Group: Physics and Astronomy High Energy Physics Seminars

Category: Academic


TES-based dark matter detectors and certain qubit experiments rely on understanding the dynamics of quasiparticles (QP), broken Cooper pairs in superconducting aluminum. We present preliminary data from a laser-scanning microscopy-based technique for measuring 100µm-scale QP diffusion in superconducting Al films. QP are produced at a localized origin in the Al film using a focused 1550nm laser coupled to a single-mode optical fiber mounted on piezoelectric nanopositioners. The resulting QP propagation can then be monitored using a transition edge sensor (TES), and described using a simple diffusion model.

David Osterman, PhD Student, University of Massachusetts, Amherst

Enectali Figueroa-Feliciano


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