English: Optical mirror made of a double ring coupled to a waveguide. Forward propagating waves in the waveguide (green) couple to anti-clockwise traveling waves in the rings (green). Due to the inter-ring coupling, these waves couple to clockwise traveling waves in the rings (red), which in turn generate backward (reflected) waves in the waveguide (red).
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.