Photonic structures at the crossroad of microwave and optical beams

Summary form only given. Materials with regularly arranged voids in the high-refractive-index matrix are known to stop or confine photons. Our approach is based on somewhat opposite idea of electric or/and magnetic dipoles suspended in low-refraction-index medium. The size of dipoles is small compared to the photon wavelength, and, as such, they are conveniently modelled in GHz range on single elements like split electrically conductive rings or ordered ring arrays. The ring material (copper, gold, superconductor) is rather nonmagnetic but AC current vortex brings about the magnetic moment, and the slit of the ring acts as the electric dipole. Vivid polemic about the negative refraction is mentioned. The ring technology implies either micro-mechanics or photolithography depending on the photon wavelength range. Small elements of ferromagnetic, semiconducting or dielectric material implemented in the rings allow for tuning the self-oscillation frequency of dipoles. Such photonic structures are especially prospective if they are nonlinear presenting a link between interpenetrating microwave and optical beams.