Superconductor Optical Devices Modified By Patterned Illumination
  We show that a thin superconductor slab illuminated by a desired pattern of light behaves as a completely controllable two-dimensional photonic media that could be applied in a wide range of optical devices. In this case, the permittivity spatial variation, which is fundamentally required in many photonic devices, is achieved by means of selective variation of cooper-pair density under patterned irradiation. The process of photo-effect in superconductors is the proposed mechanism for deformation of spatial distribution of cooper pair density and consequently non-uniform permittivity. In this perspective, the effects of non-uniform photon irradiation on the density of paired carriers and two-dimensional position dependent permittivity are investigated. Applying these results, the optical properties of several illumination patterns leading to the formation of different types of optical devices are studied. As we will show, in contrast to previous superconductor photonic crystals, the proposed structure has promising advantages such as possibility of implementing tunable heterostructures, optical gratings, and permittivity gradients with significant simplicity. 
Hamed Kamrani, Mohammad Saeed Sharif Azadeh, Alireza Kokabi, and Mehdi   Fardmanesh
cond-mat.supr-con physics.optics