Ultra-sensitive label-free in-situ detection of dynamically driven self-assembly of 2D nanoplatelets on SOI chip

TL;DR

This paper presents a novel on-chip Raman technique for real-time, label-free detection of the dynamic self-assembly of 2D nanoplatelets on silicon photonics chips, enabling advanced optoelectronic applications.

Contribution

It introduces a new in-situ Raman detection method using Fabry-Perot resonators for monitoring 2D nanoplatelet dynamics on CMOS-compatible chips.

Findings

Enhanced Raman signals via resonator design.

First in-situ detection of nanoplatelet dynamics.

Potential for real-time 3D photonic microstructure shaping.

Abstract

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.