Controlling laser spectra in a phaseonium photonic crystal using maser
  We study the control of quantum resonances in photonic crystals with electromagnetically induced transparency driven by microwave field. In addition to the control laser, the intensity and phase of the maser can alter the transmission and reflection spectra in interesting ways, producing hyperfine resonances through the combined effects of multiple scattering in the superstructure. 
Pankaj K. Jha, C. Y. Lee and C. H. Raymond Ooi
physics.atom-ph physics.optics