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2D layered SiP as anisotropic nonlinear optical material.

Huseyin Sar1, Jie Gao2, Xiaodong Yang3

  • 1Department of Mechanical and Aerospace Engineering, Missouri University of Science and Technology, Rolla, MO, 65409, USA.

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Summary

Researchers explored nonlinear optical properties of silicon phosphide (SiP), a 2D material. They observed thickness-dependent, anisotropic third-harmonic generation (THG) in SiP flakes, revealing its potential for optical applications.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Optics and Photonics

Background:

  • Two-dimensional (2D) silicon phosphide (SiP) exhibits promising optical characteristics, including a large band gap, rapid photoresponse, and significant anisotropy.
  • The nonlinear optical properties of 2D SiP remain largely unexplored, representing a knowledge gap in advanced material characterization.

Purpose of the Study:

  • To investigate the nonlinear optical properties of 2D silicon phosphide (SiP) for the first time.
  • To explore the phenomenon of third-harmonic generation (THG) in mechanically exfoliated 2D SiP flakes.
  • To analyze the thickness-dependent and in-plane anisotropic characteristics of THG in 2D SiP.

Main Methods:

  • Mechanical exfoliation was used to obtain 2D SiP flakes of varying thicknesses.
  • Angle-resolved polarized Raman spectroscopy was employed to determine the crystal orientation of the SiP flakes.
  • Third-harmonic generation (THG) measurements were conducted to study the nonlinear optical response as a function of incident polarization and flake thickness.

Main Results:

  • The study reports the observation of in-plane anisotropic third-harmonic generation (THG) in 2D SiP.
  • A distinct two-fold polarization dependence pattern was observed in the THG emission, confirming strong anisotropy.
  • The THG power was found to be dependent on the thickness of the 2D SiP flake.

Conclusions:

  • Mechanically exfoliated 2D SiP exhibits significant in-plane anisotropic nonlinear optical properties, specifically in third-harmonic generation.
  • The observed thickness-dependent THG suggests potential for tuning nonlinear optical responses in 2D SiP.
  • These findings highlight 2D SiP as a promising material for future nonlinear optical and photonic device applications.