In-plane anisotropic third-harmonic generation from germanium arsenide thin flakes

A newly introduced two-dimensional (2D) layered germanium arsenide (GeAs) has attracted growing interest due to its promising highly in-plane anisotropic crystal structure and electronic properties for photonic and optoelectronic applications. The potential of 2D layered GeAs for many applications s...

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Bibliographic Details
Published in:Scientific reports 2020-08, Vol.10 (1), p.14282-14282, Article 14282
Main Authors: Sar, Huseyin, Gao, Jie, Yang, Xiaodong
Format: Article
Language:English
Subjects:
639/301/357/1018
639/624/400/385
Frequency dependence
Germanium
Humanities and Social Sciences
multidisciplinary
Ocean currents
Optical properties
Polarization
Science
Science (multidisciplinary)
Southern Oscillation
Wind stress
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Summary:A newly introduced two-dimensional (2D) layered germanium arsenide (GeAs) has attracted growing interest due to its promising highly in-plane anisotropic crystal structure and electronic properties for photonic and optoelectronic applications. The potential of 2D layered GeAs for many applications such as anisotropic photodetection, electronics, superconductivity and thermoelectricity is being investigated in recent studies. However, the intrinsic nonlinear optical properties of 2D layered GeAs have not been explored yet. Here, thickness- and incident polarization-dependent in-plane anisotropic third-harmonic generation (THG) from the mechanically exfoliated thin GeAs flakes is reported. Furthermore, the effect of the flake thickness on the THG conversion efficiency is shown to find the optimal thickness range for high conversion efficiency. The polarization state of the emitted THG signal is also analyzed by measuring the Stokes parameters with different polarization states of the pump beam to demonstrate the capability of controlling the intensity and polarization of TH emission. Our results will create new opportunities for advancing anisotropic optical devices used for future photonic integration, optical communication and optical information processing.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-020-71244-y