Mie-Void-Enabled WS₂ Excitonic Emitters with Nanoscale Footprints

Area of Science:

• Materials Science
• Nanotechnology
• Optoelectronics

Background:

• Monolayer transition metal dichalcogenides (1L TMDs) exhibit strong excitonic effects, making them promising for light-emitting devices.
• Conventional methods use dielectric optical resonators to enhance emission but face challenges like large footprints and interface-induced suppression.

Purpose of the Study:

• To demonstrate nanoscale tungsten disulfide (WS₂) excitonic light-emitting devices.
• To overcome limitations of existing resonator-based approaches for 1L TMDs.
• To achieve high-resolution light-emitting displays using novel nanostructures.

Main Methods:

• Fabrication of nanoscale WS₂ devices utilizing Mie voids.
• Exploitation of localized Mie resonance within nanoscale air holes.
• Suspension of 1L WS₂ within air to mitigate interface effects.

Main Results:

• Mie voids enhance exciton emission through localized Mie resonance.
• Elimination of interface-induced exciton emission suppression by suspending 1L WS₂.
• Realization of a high-resolution light-emitting display with a pixel size of approximately 1.12 μm.

Conclusions:

• Mie voids offer a novel platform for nanoscale 2D semiconductor light sources.
• This technology enables high-resolution light-emitting displays.
• The approach overcomes fundamental challenges in integrating 1L TMDs with optical resonators.