Ultrahigh-resolution nonlinear optical imaging of the armchair orientation in 2D transition metal dichalcogenides

Sotiris Psilodimitrakopoulos; Leonidas Mouchliadis; Ioannis Paradisanos; Andreas Lemonis; George Kioseoglou; Emmanuel Stratakis

doi:10.1038/lsa.2018.5

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Ultrahigh-resolution nonlinear optical imaging of the armchair orientation in 2D transition metal dichalcogenides

Original Articles

- Ultrahigh-resolution nonlinear optical imaging of the armchair orientation in 2D transition metal dichalcogenides
- Light: Science & Applications Vol. 7, Issue 3, (2018)
- Affiliations：
  
  1.Institute of Electronic Structure and Laser, Foundation for Research and Technology-Hellas, Heraklion Crete 71110, Greece
  2.Department of Physics, University of Crete, Heraklion Crete 71003, Greece
  3.Department of Materials Science and Technology, University of Crete, Heraklion Crete 71003, Greece
- Author bio：
  
  E Stratakis, Email: stratak@iesl.forth.gr
- Funds：
- DOI：10.1038/lsa.2018.5
  CLC：
- Published：2018，
  
  Published Online：04 May 2018，
  
  Received：31 August 2017，
  
  Revised：08 January 2018，
  
  Accepted：14 January 2018
- Accepted：
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Psilodimitrakopoulos, S. et al. Ultrahigh-resolution nonlinear optical imaging of the armchair orientation in 2D transition metal dichalcogenides. Light: Science & Applications, 3, 18005 (2018).
DOI：

Psilodimitrakopoulos, S. et al. Ultrahigh-resolution nonlinear optical imaging of the armchair orientation in 2D transition metal dichalcogenides. Light: Science & Applications, 3, 18005 (2018). DOI： 10.1038/lsa.2018.5.

摘要

Abstract

We used nonlinear laser scanning optical microscopy to study atomically thin transition metal dichalcogenides (TMDs) and revealed

with unprecedented resolution

the orientational distribution of armchair directions and their degree of organization in the two-dimensional (2D) crystal lattice. In particular

we carried out polarization-resolved second-harmonic generation (PSHG) imaging for monolayer WS

and obtained

with high-precision

the orientation of the main crystallographic axis (armchair orientation) for each individual 120 × 120 nm

pixel of the 2D crystal area. Such nanoscale resolution was realized by fitting the experimental PSHG images

obtained with sub-micron precision

to a new generalized theoretical model that accounts for the nonlinear optical properties of TMDs. This enabled us to distinguish between different crystallographic domains

locate boundaries and reveal fine structure. As a consequence

we can calculate the mean orientational average of armchair a

ngle distributions in specific regions of interest and define the corresponding standard deviation as a figure-of-merit for the 2D crystal quality.

关键词

Keywords

armchair orientation mappingatomically thin transition metal dichalcogenidescrystal quality markergraphene-related materialspolarization-resolved second-harmonic generation

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