Second harmonic generation in 2D layered materials: SnS₂, CrCl₃

Ranjit A. Patil^1*, Vincent Peheliwa¹, Chien-Chih Lai¹, Yuan-Ron Ma¹

¹Department of Physics, National Dong Hwa University, Hualien, Taiwan

* Presenter:Ranjit A. Patil, email:rapatil@gms.ndhu.edu.tw

Second harmonic generation (SHG) of the two-dimensional (2D) layered materials has attracted immense research interests due to the abilities of photon generation, manipulation, transmission, detection, and imaging for the applications of modern on-chip nanophotonic devices. The 2D materials have brought a spectacular revolution in fundamental research and industrial applications due to their unique physical properties of atomically thin thickness, strong light-matter interaction, unity valley polarization, and enhanced many-body interactions. To fully explore their exotic physical properties and facilitate potential applications in electronics and optoelectronics, an effective and versatile optical SHG method is highly necessitated. More importantly, SHG can acquire abundant information ranging from crystallographic, and electronic, to magnetic properties in various 2D materials due to its sensitivity to both spatial-inversion symmetry and time-reversal symmetry. The broken inversion symmetry associated with their 2D nature enables the development of nanophotonic and optoelectronic devices based on the second harmonic generation effect. These advantages accompanied by its characteristics of non-invasion and high throughput make SHG a powerful tool for 2D materials. We focus on the SHG in 2D SnS₂, CrCl₃, GaTe layers.

Keywords: Second harmonic generation , 2D materials, broken inversion symmetry, nanophotonics, semiconductors