  High-temperature superconductor (HTS) BSCCO-based coherent terahertz (THz)
sources have shown great potential as one of the leading solid-state platforms
in THz science and technology. Stable, and chip-scale photonic components must
be developed to effectively and efficiently control and manipulate their
coherent radiation, especially for future communication systems and network
applications. Here, we report on the design, simulation and modelling of
ultrafast THz metamaterial photonic integrated circuits, on a few nanometers
thick HTS BSCCO van der Waals (vdWs), capable of the active modulation of phase
with constant transmission coefficient over a narrow frequency range.
Meanwhile, the metamaterial circuit works as an amplitude modulator without
significantly changing the phase in a different frequency band. Under the
application of ultrashort optical pulses, the transient modulation dynamics of
the THz metamaterial offer a fast switching timescale of 50 ps. The dynamics of
picosecond light-matter interaction_ Cooper pairs breaking, photoinduced
quasiparticles generation and recombination, phonon bottleneck effect, emission
and relaxation of bosons_ in BSCCO vdWs metamaterial arrays are discussed for
the potential application of multifunctional superconducting photonic circuits
in communication and quantum technologies.
