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Strong anisotropic third-harmonic generation in layered violet phosphorus.

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Violet phosphorus, a novel 2D semiconductor, exhibits strong anisotropic third-harmonic generation (THG). Its nonlinear optical properties make it a promising material for future photonic and optoelectronic devices.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanoscience

Background:

  • Layered violet phosphorus is an emerging two-dimensional (2D) semiconductor with unique electronic and optical properties.
  • Third-harmonic generation (THG) is a significant third-order nonlinear optical process crucial for frequency conversion and optical switching.

Purpose of the Study:

  • To investigate the anisotropic third-harmonic generation (THG) properties of layered violet phosphorus.
  • To theoretically model and experimentally quantify the third-order nonlinear optical susceptibility of violet phosphorus.

Main Methods:

  • Experimental measurement of in-plane THG with polarization-dependent studies.
  • Theoretical modeling of THG response based on the crystalline symmetry of violet phosphorus.
  • Calculation of third-order nonlinear optical susceptibility tensor elements and magnitude.

Main Results:

  • Layered violet phosphorus exhibits strong anisotropic THG with a cruciate-flower-shaped polarization dependence.
  • Four non-zero third-order nonlinear optical susceptibility tensor elements were successfully quantified.
  • The magnitude of third-order nonlinear optical susceptibility |χ3| was determined to be approximately 4.0 × 10⁻¹⁹ m² V⁻², comparable to other 2D semiconductors.

Conclusions:

  • Violet phosphorus demonstrates significant potential for nonlinear optical applications due to its strong anisotropic THG.
  • The quantified nonlinear optical susceptibility highlights its suitability as a building block for photonic devices.
  • This study establishes violet phosphorus as a promising material in the field of 2D nonlinear optics.