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Related Concept Videos

UV–Vis Spectrum01:30

UV–Vis Spectrum

When light passes through a substance, a portion of the light is absorbed while the remaining light is reflected or transmitted. If the molecule absorbs light between the wavelengths of 180–400 nm range, the UV spectrum is obtained, and if it absorbs light in the 400–780 nm wavelength range, the visible spectrum is obtained.     
The UV–Vis spectrum of a molecule is the plot of its absorbance versus wavelength. The plot is drawn by taking molar absorptivity (ε) or log ε on the y-axis (ordinate)...

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Thickness- and Wavelength-Dependent Nonlinear Optical Absorption in 2D Layered MXene Films.

Di Jin1,2, Wenbo Liu1, Linnan Jia1,3

  • 1Optical Sciences Centre Swinburne University of Technology Hawthorn 3122 Victoria Australia.

Small Science
|April 11, 2025
PubMed
Summary

This study explores the nonlinear optical absorption of 2D Ti3C2Tx MXene films. The material exhibits tunable absorption from reverse saturable to saturable behavior, showing potential for photonic devices.

Keywords:
2D materialsMXenesZ‐scan techniquenonlinear opticson‐chip integrations

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Area of Science:

  • Materials Science
  • Optics and Photonics
  • Nanotechnology

Background:

  • MXenes are a rapidly expanding family of 2D materials with significant research interest.
  • Nonlinear optical absorption (NOA) is crucial for advanced photonic applications.
  • Ti3C2Tx MXene films offer tunable properties for optoelectronic devices.

Purpose of the Study:

  • To investigate the nonlinear optical absorption (NOA) properties of Ti3C2Tx MXene films.
  • To explore the layer-dependent and power-dependent NOA behavior.
  • To assess the potential of MXene films in nonlinear photonic devices.

Main Methods:

  • Developed a transfer-free, layer-by-layer film coating method for MXene films.
  • Utilized the Z-scan technique to characterize NOA at ~800 nm.
  • Integrated MXene films onto silicon nitride waveguides for characterization at ~1550 nm.

Main Results:

  • Ti3C2Tx MXene films exhibit strong, layer-dependent NOA.
  • NOA transitioned from reverse saturable absorption (RSA) to saturable absorption (SA) as layer number increased from 5 to 30 at ~800 nm.
  • Nonlinear absorption coefficient (β) varied significantly, showing power-dependent trends and different behavior at ~1550 nm.

Conclusions:

  • 2D Ti3C2Tx MXene films possess intriguing and tunable nonlinear optical properties.
  • The layer-dependent NOA behavior highlights their versatility for photonic applications.
  • MXene films show promise for implementing high-performance nonlinear photonic devices.