Ultrafast All-Optical Modulation in 2D Hybrid Perovskites

Gustavo Grinblat, Ibrahim Abdelwahab, Michael P. Nielsen, Paul Dichtl, Kai Leng, Rupert F. Oulton, Kian Ping Loh, Stefan A. Maier

Research output: Journal article publicationJournal articleAcademic researchpeer-review

25 Citations (Scopus)

Abstract

Two-dimensional (2D) hybrid organic-inorganic Ruddlesden-Popper perovskites (RPPs) have been recently shown to exhibit large nonlinear optical properties due to the strong excitonic effects present in their multiple quantum wells. In this work, we use nondegenerate pump-probe spectroscopy in the 600-1000 nm wavelength range to study the influence of nonlinear effects on the ultrafast dynamics of 2D RPP thin flakes. We find that, under sub-bandgap excitation, â100 nm thick perovskite sheets allow up to â2% reflectivity modulation within a 20 fs period, due to the nonlinear optical Kerr effect and two-photon absorption, surpassing by a factor of â5 the reported nonlinear performance of photonic metasurfaces and single nanoantennas. When the excitation is resonant with the excitonic absorption, the ultrafast nature of the nonlinear response is lost due to the presence of linear absorption creating long-lived free carriers. Our results suggest that 2D RPPs are potential nanoscale all-optical modulators in the visible/near-infrared waveband for applications such as ultrafast information processing, optical data transmission, and high-performance computing.

Original languageEnglish
Pages (from-to)9504-9510
Number of pages7
JournalACS Nano
Volume13
Issue number8
DOIs
Publication statusPublished - 27 Aug 2019
Externally publishedYes

Keywords

  • 2D Ruddlesden-Popper perovskites
  • optical Kerr effect
  • optical switching
  • pump-probe spectroscopy
  • two-photon absorption

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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