OSE Seminar by Dr. Jean Claude Diels on Nanophase sensitivity, towards measurements of nanoradian Faraday rotation, femtometer displacement, accelerometry, etc.

Departmental News

 Dr. Jean Claude Diels

Posted: August 22, 2022

Date: Thursday, August 25, 2022

Time:  12:15 PM - 1:15 PM

Location:  at CHTM, Rm. 103


Prof. Jean-Claude Diels 

University of New Mexico, Department of Physics and CHTM


Most - if not all - optical sensors measure the amplitude of a photodetector signal. Even phase measurements are performed by measuring the amplitude of interfering beams. A sensing is demonstrated based on direct measurement of optical phase. A phase sensitivity of 0.4 · 10−9 radian is demonstrated, close to the quantum limit. The applications to sensing are multiple: femtometer displacement, accelerometers, gyroscopes, field measurements, etc. . . For instance, in magnetic field detection, a nanoradian phase shift in circular polarization implies a Faraday rotation of a nanoradian (am angular resolution that cannot be approached with conventional amplitude measurements).