Size-Dependent Control of Exciton–Polariton Interactions in WS2 Nanotubes

Sudarson S. Sinha, Alla Zak, Rita Rosentsveig, Iddo Pinkas, Reshef Tenne, Lena Yadgarov

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

Multiwall WS2 nanotubes (and fullerene-like nanoparticles thereof) are currently synthesized in large amounts, reproducibly. Other than showing interesting mechanical and tribological properties, which offer them a myriad of applications, they are recently shown to exhibit remarkable optical and electrical properties, including quasi-1D superconductivity, electroluminescence, and a strong bulk photovoltaic effect. Here, it is shown that, using a simple dispersion-fractionation technique, one can control the diameter of the nanotubes and move from pure excitonic to polaritonic features. While nanotubes of an average diameter >80 nm can support cavity modes and scatter light effectively via a strong coupling mechanism, the extinction of nanotubes with smaller diameter consists of pure absorption. The experimental work is complemented by finite-difference time-domain simulations, which shed new light on the cavity mode–exciton interaction in 2D materials. Furthermore, transient absorption experiments of the size-fractionated nanotubes fully confirm the steady-state observations. Moreover, it is shown that the tools developed here are useful for size control of the nanotubes, e.g., in manufacturing environment. The tunability of the light–matter interaction of such nanotubes offers them intriguing applications such as polaritonic devices, in photocatalysis, and for multispectral sensors.

Original languageEnglish
Article number1904390
JournalSmall
Volume16
Issue number4
DOIs
StatePublished - 1 Jan 2020
Externally publishedYes

Keywords

  • WS nanotubes
  • diameter-dependent fractionation
  • exciton–polaritons
  • finite difference time domain (FDTD) simulation
  • transient absorption

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