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Second-harmonic generation in multilayer hexagonal boron nitride flakes.

Sejeong Kim, Johannes E Fröch, Augustine Gardner

|November 28, 2019

Summary

This summary is machine-generated.

Thick hexagonal boron nitride (hBN) flakes exhibit strong second-harmonic generation (SHG), proving useful for nonlinear optics. SHG also effectively maps layer structure in thick hBN, simplifying material characterization.

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Area of Science:

Materials Science
Optics and Photonics
Condensed Matter Physics

Background:

Hexagonal boron nitride (hBN) is a layered material with unique optical properties.
Nonlinear optical phenomena, such as second-harmonic generation (SHG), are crucial for optical applications.
Few-layer hBN has been explored for nonlinear optics, but thicker flakes are easier to produce.

Purpose of the Study:

To investigate SHG in thick hBN flakes (109-111 layers).
To assess the potential of thick hBN as a platform for nonlinear optics.
To evaluate SHG as a tool for characterizing layer structure in thick hBN.

Main Methods:

Fabrication of thick hBN flakes via exfoliation.
Measurement of SHG from the thick hBN flakes.
Spatial mapping of SHG intensity across the flakes.

Main Results:

Observed significant SHG from thick hBN flakes.
Measured effective second-order susceptibility comparable to few-layer hBN.
Demonstrated SHG as a viable method for layer structure characterization in thick hBN.

Conclusions:

Thick hBN flakes are suitable for nonlinear optical applications.
The ease of exfoliation and large size of thick flakes make them advantageous.
SHG is a powerful, non-destructive technique for analyzing the layer structure of thick hBN.