  Emergent technologies that make use of novel materials and quantum properties
of light states are at the forefront in the race for the physical
implementation, encoding and transmission of information. Photonic crystals
(PCs) enter this paradigm with optical materials that allow the control of
light propagation and can be used for optical communication, and photonics and
electronics integration making use of materials ranging from semiconductors, to
metals, metamaterials, and topological insulators, to mention but a few. In
particular, here we show how designer superconductor materials integrated into
PCs fabrication allow for an extraordinary reduction of electromagnetic waves
damping and possibilitate their optimal propagation and tuning through the
structure, below critical superconductor temperature. We experimentally
demonstrate, for the first time, a successful integration of ferroelectric and
superconductor materials into a one-dimensional (1D) PC composed of
(BTO/YBCO)N/STO bilayers that work in the whole visible spectrum, and below
(and above) critical superconductor temperature (measured in the 10-300 K
range). Theoretical calculations support, for different number of bilayers N,
the effectiveness of the produced 1D PCs and pave the way for novel
optoelectronics integration and information processing in the visible spectrum
at low temperature, while preserving their electric and optical properties.

Materials Science;Optics