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. 2016 Mar 3;6:22620. doi: 10.1038/srep22620

Figure 1. InSe crystal structure and schematic of Second Harmonic Generation geometry.

Figure 1

(a) Optical microscope image showing a mechanically exfoliated InSe flake with different thicknesses displaying a variety of vivid colors. (b) InSe crystal structure (top view) (c) Low energy electron diffraction image of InSe crystal, exhibiting three-fold symmetry. (d) Schematic portraying the different SHG components produced in atomically thin InSe in reflection upon excitation by the fundamental beam. For certain thicknesses of InSe, SHG contributions produced due to InSe-Air and InSe-substrate interfaces are comparable to bulk contributions and produce strong interference patterns.