Extended Data Fig. 9: SHG properties of Nb3Cl8 and Nb3SeI7.
From: Near-100% spontaneous rolling up of polar van der Waals materials
a and b, Wavelength-dependent SHG response of 1D Nb3Cl8 and Nb3SeI7 nanoscrolls from 750 nm to 950 nm. The power is constant at different wavelengths. ω is the frequency of the second-harmonic light. c, SHG response of several randomly selected 1D Nb3Cl8 nanoscrolls on SiO2/Si substrate. d, Enlarged SHG response with increasing thickness in 2D Nb3SeI7 flake. e, SHG response of several randomly selected 1D Nb3SeI7 nanoscrolls on SiO2/Si substrate. f, Polarization-resolved SHG measurements of individual Nb3SeI7 nanoscroll.
