Abstract
In article number 2101711, Kung-Hsuan Lin, Shi-Wei Chu, and co-workers demonstrate a temporally tunable transient nonlinearity based on fluence-dependent carrier dynamics. This is exemplified via Auger recombination on silicon nanostructures. By combining spatial confocal x-scan and temporal pump–probe techniques, the fluence dependence is analyzed at different pump–probe delays and various transient nonlinearities are found, including sub-linear, super-linear, and surprisingly full saturation behaviors. [Cover image: artwork by Guan-Jie Huang.]
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