University of Minnesota
School of Physics & Astronomy

Physics and Astronomy Calendar

Wednesday, March 21st 2018
1:25 pm:
Speaker: Li He, University of Minnesota
Subject: Optomechanical measurement of photon spin angular momentum and optical torque in integrated photonic devices
This week's sack lunch talk will be on Wed. at the usual CM seminar time and place

Photons carry spin angular momentum when circularly or elliptically polarized. During light-matter interaction, transfer of angular momentum induces optical torque. Here, we demonstrate the measurement of the spin angular momentum of photons propagating in a silicon waveguide and the use of optical torque to actuate rotational motion of an optomechanical device. We show that the sign and magnitude of the optical torque are determined by the photon polarization states that are synthesized on the chip. Our study reveals the mechanical effect of photon’s polarization degree of freedom and demonstrates its control in integrated photonic devices.

Faculty Host: Paul Crowell

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