Light–matter coupling in large-area van der Waals superlattices

Pawan Kumar, Jason Lynch, Baokun Song, Haonan Ling, Francisco Barrera, Kim Kisslinger, Huiqin Zhang, Surendra B. Anantharaman, Jagrit Digani, Haoyue Zhu, Tanushree H. Choudhury, Clifford McAleese, Xiaochen Wang, Ben R. Conran, Oliver Whear, Michael J. Motala, Michael Snure, Christopher Muratore, Joan M. Redwing, Nicholas R. GlavinEric A. Stach, Artur R. Davoyan, Deep Jariwala

Abstract

Two-dimensional (2D) crystals have renewed opportunities in design and assembly of artificial lattices without the constraints of epitaxy. However, the lack of thickness control in exfoliated van der Waals (vdW) layers prevents realization of repeat units with high fidelity. Recent availability of uniform, wafer-scale samples permits engineering of both electronic and optical dispersions in stacks of disparate 2D layers with multiple repeating units. Here we present optical dispersion engineering in a superlattice structure comprising alternating layers of 2D excitonic chalcogenides and dielectric insulators. By carefully designing the unit cell parameters, we demonstrate greater than 90% narrow band absorption in less than 4 nm of active layer excitonic absorber medium at room temperature, concurrently with enhanced photoluminescence in square-centimetre samples. These superlattices show evidence of strong light–matter coupling and exciton–polariton formation with geometry-tuneable coupling constants. Our results demonstrate proof of concept structures with engineered optical properties and pave the way for a broad class of scalable, designer optical metamaterials from atomically thin layers.

Original languageEnglish (US)
JournalNature nanotechnology
DOIs
StateAccepted/In press - 2021

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Atomic and Molecular Physics, and Optics
  • Biomedical Engineering
  • Materials Science(all)
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this