Enhanced Excitation and Emission from 2D Transition Metal Dichalcogenides with All-Dielectric Nanoantennas
arXiv:1810.06417 · doi:10.1088/1361-6528/ab0daf
Abstract
The recently emerged concept of all-dielectric nanophotonics based on optical Mie resonances in high-index dielectric nanoparticles has proven a promising pathway to boost light-matter interactions at the nanoscale. In this work, we discuss the opportunities enabled by the interaction of dielectric nanoresonators with 2D transition metal dichalcogenides (2D TMDCs), leading to weak and strong coupling regimes. We perform a comprehensive analysis of bright exciton photoluminescence (PL) enhancement from various 2D TMDCs, including WS2, MoS2, WSe2, and MoSe2 via their coupling to Mie resonances of a silicon nanoparticle. For each case, we find the system parameters corresponding to maximal PL enhancement taking into account excitation rate, Purcell factor, and radiation efficiency. We demonstrate numerically that all-dielectric Si nanoantennas can significantly enhance the PL intensity from 2D TMDC by a factor of hundred through precise optimization of the geometrical and material parameters. Our results may be useful for high-efficiency 2D TMDC-based optoelectronic, nanophotonic, and quantum optical devices.
References in corpus (18)
- Atomically thin MoS2: A new direct-gap semiconductor
- Control of valley polarization in monolayer MoS2 by optical helicity
- Two-Dimensional Material Nanophotonics
- Exciton Binding Energy and Nonhydrogenic Rydberg Series in Monolayer WS2
- Excitons in atomically thin transition metal dichalcogenides
- Evolution of Electronic Structure in Atomically Thin Sheets of WS2 and WSe2
- Observation of giant bandgap renormalization and excitonic effects in a monolayer transition metal dichalcogenide semiconductor
- Measurement of the optical dielectric function of transition metal dichalcogenide monolayers: MoS2, MoSe2, WS2 and WSe2
- How to face the loss in plasmonics and metamaterials
- Optical signature of symmetry variations and spin-valley coupling in atomically thin tungsten dichalcogenides
- Probing Excitonic Dark States in Single-layer Tungsten Disulfide
- Direct imaging of the band profile in single layer on graphite: quasiparticle energy gap, metallic edge states and edge band bending
- Observation of tunable charged exciton polaritons in hybrid monolayer WS2 plasmonic nanoantenna system
- Atomically thin mirrors made of monolayer semiconductors
- Radiative control of dark excitons at room temperature by nano-optical antenna-tip induced Purcell effect
- Silicon Mie Resonators for Highly Directional Light Emission from monolayer MoS2
- Nanophotonics with 2D Transition Metal Dichalcogenides
- Laser fabrication of crystalline silicon nanoresonators from an amorphous film for low-loss all-dielectric nanophotonics