Nonlinear Optical Properties of 0D Chiral Hybrid Bismuth Iodides

• DOI: 10.1002/adma.202501022
• Publication Date: 2025-04-05T02:08:16Z
• Authors: Aman Chaturvedi; Parikshit Kumar R...; Shabnum Maqbool; Angshuman Nag; Pankaj Mandal
• Keywords: Bismuth; Metal halides

Chiral hybrid metal halides show great promise for nonlinear optical (NLO) applications like circularly polarized second harmonic generation (SHG). The inherent toxicity of lead is a concern the widespread adoption frequently explored lead-based chiral halides. Here, we report and third-order NLO properties lead-free 0D compounds, (R-/S-MBA)4Bi2I10, their achiral counterpart, (Rac-MBA)4Bi2I10 (MBA: methylbenzylammonium) under excitation wavelength ranging 1360-1590 nm. (R-/S-MBA)4Bi2I10 exhibits strong SHG along with stronger third (THG). crystals showed high sensitivity to handedness pump light (gSHG - CD ≈ 9% at 1510 nm). THG response shows resonance enhancement matching excitonic absorption. Achiral maximum (χ(3) = 1.05 × 10⁻¹⁸ m2 V- 2). Z-scan measurements non-resonant femtosecond pulse 800 nm yield absorption coefficients (β) refractive index (n2) all three samples, exhibiting highest values. These halides, efficient nonlinearity, stability, are potential candidates such as Kerr-based switching, up-conversion, communication.