Nonlinear optical absorption of SnX2 (XÂ =Â S, Se) semiconductor nanosheets

The nonlinear absorption performance of SnX2 (X = S, Se) was measured by Z-Scan technique at nanosecond pulse and picosecond pulse, the results show that SnS2 nanosheets have excellent optical limiting property and optical limiting threshold Fth is about 0.23 J/cm2. However, SnSe2 nanosheets exhibit saturable absorption behavior.171