Search For Gravitational Waves Through the Electromagnetic Faraday   Rotation
  A method is given which renders indirect detection of strong gravitational waves possible. This is based on the reflection (collision) of a linearly polarized electromagnetic shock wave from (with) a cross polarized impulsive and shock gravitational waves in accordance with the general theory of relativity. This highly non-linear process induces a detectable Faraday rotation in the polarization vector of the electromagnetic field. 
Mustafa Halilsoy and Ozay Gurtug