Size Dependence of the Third-Order Optical Nonlinear Susceptibility of PbS Nanocrystals in PVA

Abstract

We have synthesized a composite material containing semiconductor nanocrystals with a high third-order optical nonlinear susceptibility χ⁽³⁾ (ω) = (6.5±2.3) · 10⁻¹⁶ m²/V² (PbS-18 nm) at λ = 1.064 nm in the case where the nanocrystal size approaches the Bohr radius of an exciton in the material.

Keywords:

• composite material
• nanoparticles
• nonlinear optical susceptibility