0D chiral hybrid indium(III) halides for second harmonic generation

Area of Science:

• Materials Science
• Crystallography
• Optics

Background:

• Chiral metal halides are promising for nonlinear optical (NLO) devices due to inherent non-centrosymmetry.
• Research on chiral hybrid indium halides, particularly for second-harmonic generation (SHG), is limited.

Purpose of the Study:

• To synthesize and characterize new chiral hybrid indium halides.
• To investigate their nonlinear optical properties, focusing on second-harmonic generation (SHG).

Main Methods:

• Synthesis of zero-dimensional (0D) chiral hybrid indium halides: (R-MPEA)6InCl9 and (S-MPEA)6InCl9.
• Crystallographic analysis to determine space groups (P3221 and P3121).
• Nonlinear optical (NLO) property measurements, including SHG response, polarization ratio, and laser damage threshold (LDT).

Main Results:

• Successfully synthesized two new 0D chiral hybrid indium halides.
• Crystals confirmed to be non-centrosymmetric (P3221 and P3121 space groups).
• Observed strong SHG responses with high polarization ratios and high laser damage thresholds (LDT).

Conclusions:

• This work expands the library of chiral hybrid metal halide materials.
• Provides a viable strategy for designing intrinsically non-centrosymmetric materials for NLO applications.
• Demonstrates the potential of these new materials for next-generation NLO devices.