  Fluid dispersed two-dimensional (2D) composite materials with dynamically
tunable functional properties have recently emerged as a novel highly promising
class of optoelectronic materials, opening up new routes not only for the
emerging field of metamaterials but also to chip-scale multifunctional
metadevices. However, in-situ monitoring and detection of the dynamic ordering
of 2D nanoparticles on chip and during the device operation is still a huge
challenge. Here we introduce a novel approach for on-chip, in-situ Raman
characterisation of 2D-fluid composite materials incorporated into Si photonics
chip. In this work the Raman signal for 2D nanoplatelets is selectively
enhanced by Fabry-Perot resonator design of CMOS photonic-compatible
microfluidic channels. This has then been extended to demonstrate the first
in-situ Raman detection of the dynamics of individual 2D nanoplatelets, within
a microfluidic channel. Our work paves the way for the first practicable
realisation of 3D photonic microstructure shaping based on 2D-fluid composites
and CMOS photonics platform.
