Imaging the crystal structure of few-layer two-dimensional crystals by optical nonlinearity

Author

Malard, Leandro M. ; Alencar, Thonimar V. ; Barboza, Ana Paula M. ; Kin Fai Mak ; de Paula, Ana M.

Author_Institution

Dept. of Phys., Fed. Univ. of Minas Gerais, Belo Horizonte, Brazil

fYear

2013

fDate

9-14 June 2013

Firstpage

1

Lastpage

2

Abstract

We report the observation of second harmonic generation (SHG) from odd-layer MoS₂ atomic crystal. In contrast, no SHG is observed for samples with even layer numbers due to the restoration of perfect inversion symmetry. Moreover, the SHG intensity is found to directly reflect the underlying 3-fold rotation symmetry of the crystal, which provides a powerful method for optical imaging of the material crystal structure with sub-micron resolution.

Keywords

crystal structure; crystal symmetry; image resolution; molybdenum compounds; optical harmonic generation; optical images; 3-fold rotation symmetry; MoS₂; SHG intensity; crystal structure; few-layer two-dimensional crystals; odd-layer MoS₂ atomic crystal; optical imaging; optical nonlinearity; perfect inversion symmetry; second harmonic generation; submicron resolution; Atom optics; Atomic layer deposition; Crystals; Harmonic analysis; Nonlinear optics; Optical harmonic generation; Optical imaging;

fLanguage

English

Publisher

ieee

Conference_Titel

Lasers and Electro-Optics (CLEO), 2013 Conference on

Conference_Location

San Jose, CA

Type

conf

Filename

6834046