Abstract
Integrated photonic devices operating via optical nonlinearities offer a
powerful solution for all-optical information processing, yielding
processing speeds that are well beyond that of electronic processing as
well as providing the added benefits of compact footprint, high
stability, high scalability, and small power consumption. The increasing
demand for high-performance nonlinear integrated photonic devices has
facilitated the hybrid integration of novel materials to address the
limitations of existing integrated photonic platforms, such as strong
nonlinear optical absorption or an inadequate optical nonlinearity.
Recently, graphene oxide (GO), with its large optical nonlinearity, high
flexibility in altering its properties, and facile fabrication
processes, has attracted significant attention, enabling many hybrid
nonlinear integrated photonic devices with improved performance and
novel capabilities. This paper reviews the applications of GO to
nonlinear integrated photonics. First, an overview of GO’s optical
properties and the fabrication technologies needed for its on-chip
integration is provided. Next, the state-of-the-art GO nonlinear
integrated photonic devices are reviewed, together with comparisons of
the nonlinear optical performance of different integrated platforms
incorporating GO. Finally, the challenges and perspectives of this field
are discussed.