Gyrotropy-Controlled Uniform Bragg Reflector

We show that a wavelength-independent circular Bragg phenomenon can be exhibited in Faraday chiral media, where the externally applied magnetic field not only relaxes the previously identified matching condition but also offers a degree of freedom for manipulating the location of the chirality-domain resonance and the corresponding bandwidth. Due to uniformity, the phenomenon is necessarily broadband, and applications in highly efficient optical modulation appear within reach of parameters currently achieved in complex meta-media.