Abstract

One-dimensional (1D) free-standing nanowires are particularly important for carrier confinement in two dimensions, which provides a platform to explore the nonlinear optical phenomena at the nanoscale. In this Letter, we demonstrate saturable absorption in the resonant and above-bandgap excitations of both ns and fs pulses in 1D crystalline ${\mathrm{Sb}}_2{\mathrm{Se}}_3$ nanowires prepared by the facile hydrothermal method. Impressively, the average length of the nanowires extends to a few micrometers with a high aspect ratio of 300. The excited-state to ground-state absorption cross-section ratio in ${\mathrm{Sb}}_2{\mathrm{Se}}_3$ nanowires is $\approx 0.23$, which suggests that they can be utilized as passive mode lockers.

© 2016 Optical Society of America

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