Light matter interaction in van der Waals heterostructures with Mie voids

TL;DR

This paper demonstrates a hybrid platform combining monolayer WS2 with Mie void resonators in Bi2Te3, enabling enhanced nonlinear optical effects and spatial control of emission for advanced photonic applications.

Contribution

It introduces a novel hybrid photonic platform integrating monolayer WS2 with Mie voids in Bi2Te3, enabling tunable nonlinear optical responses and spatial emission control.

Findings

Enhanced photoluminescence and second-harmonic generation observed

Spatially resolved hotspots map localized resonant modes

Cavity geometry and pump wavelength tune emission

Abstract

Recently introduced concept of Mie voids allows to enhance the field localization inside air cavities embedded in high-index materials. Mie voids provide an alternative approach to conventional dielectric resonators that confine optical fields within bulk high-index materials. Building on this concept, here we present a hybrid photonic platform that integrates monolayer WS2 with Mie void resonators patterned in a high-index Bi2Te3 substrate. By carefully aligning the dipolar void resonance with the excitonic transition of WS2, we achieve substantially enhanced photoluminescence and second-harmonic generation. Far-field imaging of the harmonic fields reveals spatially resolved hotspots that directly map localized resonant modes, with their positions tunable by cavity geometry and pump wavelength. This approach enables real-space control of nonlinear emission at the single-resonator level, offering a robust and reconfigurable platform for next-generation nonlinear photonics and surface-enhanced optical sensing.