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Second-Harmonic Young's Interference in Atom-Thin Heterocrystals.

Wontaek Kim1, Je Yhoung Ahn1, Juseung Oh1

  • 1Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang, Gyeongbuk 37673, Korea.

Nano Letters
|November 18, 2020
PubMed
Summary
This summary is machine-generated.

Second-harmonic generation in 2D semiconductors is driven by optical interference. This study quantifies phase differences, revealing potential for tailored nonlinear optics with atom-thick materials.

Keywords:
phase interferometrysecond-harmonic generationtransition metal dichalcogenidestwo-dimensional heterocrystals

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Area of Science:

  • Nonlinear Optics
  • Condensed Matter Physics
  • Materials Science

Background:

  • Second-harmonic generation (SHG) is a nonlinear optical process where two photons combine to create one photon with double the frequency.
  • Two-dimensional (2D) semiconductors, such as transition-metal dichalcogenides, exhibit strong SHG due to excitonic resonances.
  • Understanding the fundamental mechanisms governing SHG in these materials is crucial for advanced optical applications.

Purpose of the Study:

  • To directly demonstrate and quantify the optical interference governing SHG in MoS2 and WS2 heterobilayers.
  • To investigate the frequency-dependent phase differences between coherent SH fields within these heterostructures.
  • To establish the analogy between SHG in 2D materials and Young's double-slit experiment for potential applications in parametric generation.

Main Methods:

  • Utilized spectral phase interferometry to directly probe the SHG process.
  • Employed polarization-resolved measurements to analyze the light's polarization properties.
  • Performed first-principles calculations to determine the complex susceptibility of the materials.

Main Results:

  • Directly observed that SHG in MoS2/WS2 heterobilayers results from optical interference of two coherent SH fields.
  • Quantified the frequency-dependent phase difference between these two SH fields.
  • Experimental results showed excellent agreement with theoretical calculations of complex susceptibility.

Conclusions:

  • The SHG process in 2D semiconductor heterobilayers is fundamentally governed by optical interference.
  • This interference phenomenon, analogous to Young's double-slit experiment, offers new avenues for controlling light-matter interactions.
  • Atom-thick nonlinear optical materials provide a platform for designing custom parametric generation with high efficiency.