Animation of the light circulator. Researchers at AMOLF and the University of Texas have created an on-chip circulator based on a vibrating glass structure that interacts with light.
The light beam enters at the upper left port and is forced to leave the resonator at the lower left port. The light beam that enters at that port (lower left) cannot follow the reverse path of the first light beam as it is forced to propagate to the higher right exit.
Credits: Henk-Jan Boluijt (AMOLF).
F. Ruesink, J. P. Mathew, M.-A. Miri, A. Alù, and E. Verhagen, “Optical circulation in a multimode optomechanical resonator,” Nature Communications 9, (2018) | DOI: 10.1038/s41467-018-04202-y