NPA Seminar, Alex Fieguth, Stanford University, “Probing Fundamental Physics With Levitated Force Sensors”

Event time: 
Thursday, April 14, 2022 - 1:00pm to 2:00pm
Wright Lab WNSL, WL-216 (Conference Room) See map
272 Whitney Avenue
New Haven, CT 06511
Event description: 

Microspheres have been the first objects optically levitated by Arthur Ashkin in the 1970s. While the technology itself was successfully used to trap atoms to explore new physics, the actual utilization of microspheres and other macroscopic objects as a useful tool for physics has emerged in the recent years. The unique properties of those levitated objects allows to deploy them as sensors with unmatched properties and advantages.

In this talk I will show recent demonstrations of the capabilities of microspheres as force sensors to probe minute charges far below of the size of the elementary charge as well as show how we can probe for new forces coupling to mass at short ranges. I will also discuss what is limiting the sensitivity to reach an actual measurement of the Newtonian gravitational force at scales below 40 um and explore recent advances in understanding the levitodynamics of the microspheres.

There will be a luncheon with the speaker from 12-1 p.m. in WL-216.  Lunch will be provided for up to 30 people on a first-come, first-served basis for people who RSVP by 10 a.m. on April 13th:

Please email the host for the Zoom connection information.
Host: Michael Jewell,