Size-dependent nonlinear optical properties of atomically thin PtS2 nanosheet

Chun Yin Tang, Ping Kwong Cheng, Xin Yu Wang, Sainan Ma, Hui Long, Yuen Hong Tsang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

3 Citations (Scopus)

Abstract

To manipulate the nonlinear optical absorption (NOA) properties of layered two dimensional (2D) materials by simple and cost-effective methods is an attractive research topic as the NOA properties can be further optimized for various potential applications, such as compact optical switchers, pulsed laser generation, optical limiters, and biosensors. In this work, the NOA response of the novel group 10 transition metal dichalcogenide (TMD), platinum disulfide (PtS2) is investigated with respect to different PtS2 flakes size and thickness for the first time. Four PtS2- NMP suspensions with modified size and thickness distribution were successfully fabricated. The average flake size and thickness ranged from about 565 nm to 110 nm and 30 nm–10 nm, respectively. Z-scan measurement shows that the NOA response of PtS2 depends heavily on the flake size and thickness. As the layer thickness and lateral size of the PtS2 nanosheets reduced, the widened bandgap and increased active nanosheet edges will facilitate the photon absorption and lead to an enhancement of the RSA effect. However, sustained elevation of the RSA effect will reach a saturation threshold, and the RSA response will become weaker afterwards. A variation of the NOA performance from an initial weakening of RSA response, and followed by switching to saturable absorption (SA) is observed in the Z-scan test as the flake size and thickness become lower from S3000 to S9000 PtS2 samples. This work has demonstrated a significant modification of NOA properties of the PtS2, which can further be utilized in various applications.

Original languageEnglish
Article number109694
JournalOptical Materials
Volume101
DOIs
Publication statusPublished - Mar 2020

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Computer Science(all)
  • Atomic and Molecular Physics, and Optics
  • Spectroscopy
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry
  • Electrical and Electronic Engineering

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