Chiral Hybrid Copper(I) Halides for High Efficiency Second Harmonic Generation with a Broadband Transparency Window

Abstract

Chiral hybrid organic–inorganic metal halides (HOMHs) with intrinsic noncentrosymmetry have shown great promise for applications in second‐order nonlinear optics (NLO). However, established chiral HOMHs often suffer from their relatively small band gaps, which lead to negative impacts on transparent window and laser‐induced damage thresholds (LDT). Here, we have synthesized two chiral HOMHs based on CuI halides, namely (R‐/S‐MBA)CuBr2, which feature well‐balanced NLO performances with a highly efficient SHG response, outstanding optical transparency, and high LDT. The effective second‐order NLO coefficient of (R‐MBA)CuBr2 has been determined to be ≈24.7 pm V−1, which is two orders of magnitude higher than that of their CuII counterparts. This work shows the promising potential of CuI‐based chiral HOMHs for nonlinear photonic applications in wide wavelength regions.

Oxidation-Induced Dissolution Recrystallization Structural Transformation Strategy Enhanced Nonlinear Optical Effect of Hybrid Chiral Tin Bromide Single Crystals

“…SHG signals related to the polarization angle were collected at intervals of 10° in order to study the impact of polarization on the SHG response. The polarization diagram shows that the profile of the curve can be accurately fitted to the cos 4θ function (Figure b), which is consistent with the earlier results. − The polarization dependence of R -2-mpip­[SnBr 3 ]Br exhibits a typical two-lobe shape and the greatest SHG signals at about 80 and 260°. For the p -analyzer, the computed polarization ratio, ρ = ( I max – I min )/( I max + I min ), was found to be 67.8%.…”