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Inductively Coupled Plasma-Mass Spectrometry (ICP-MS): Interferences01:20

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Inductively coupled plasma–mass spectrometry (ICP–MS) is a highly selective and sensitive technique for accurate elemental analysis. Though the analysis of ICP–MS mass spectra is comparatively straightforward, it is affected by spectroscopic and non-spectroscopic interferences. Spectroscopic interferences arise when the plasma contains ionic species with an m/z value the same as the analyte ion. Spectroscopic interference can be categorized as isobaric, polyatomic ions, and refractory oxide ion...

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Substrate Interference and Strain in the Second-Harmonic Generation from MoSe2 Monolayers.

Sudeep Puri1, Sneha Patel1, Jose Luis Cabellos2

  • 1Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, United States.

Nano Letters
|October 2, 2024
PubMed
Summary
This summary is machine-generated.

Strain engineering enhances nonlinear optical properties in 2D materials. Controlled biaxial strain and substrate interference significantly boost second-harmonic generation intensity in molybdenum diselenide monolayers.

Keywords:
2D materialsbiaxial strainsecond-harmonic generation

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Optics

Background:

  • Atomically thin 2D materials, particularly non-centrosymmetric transition metal dichalcogenides, exhibit tunable nonlinear optical properties.
  • The second-order nonlinear susceptibility (χ(2)) in these materials can be modulated by applied strain, but reports on strain's effect are conflicting.

Purpose of the Study:

  • To investigate the impact of controlled biaxial strain on the nonlinear optical response of molybdenum diselenide (MoSe2) monolayers.
  • To resolve conflicting reports regarding strain's influence on second-order nonlinear susceptibility (χ(2)).

Main Methods:

  • Growth of high-quality MoSe2 monolayers on different substrates (SiO2 and Si3N4) to induce controlled biaxial strain.
  • Experimental characterization of linear and nonlinear optical responses.
  • Theoretical calculations incorporating dielectric interference effects.

Main Results:

  • Observed up to a 15-fold enhancement in second-harmonic generation (SHG) intensity for MoSe2 monolayers on SiO2 compared to Si3N4.
  • Attributed a factor of 2 enhancement in χ(2) to biaxial strain, independent of substrate interference effects.
  • Demonstrated that substrate interference and strain are distinct mechanisms for tuning SHG strength.

Conclusions:

  • Biaxial strain is a powerful tool for enhancing the nonlinear optical properties of 2D materials.
  • Substrate engineering, in conjunction with strain, offers independent control over second-harmonic generation intensity.
  • These findings provide a pathway for designing advanced nonlinear optical devices based on 2D materials.