Nonlinear Absorption Induced Transparency and Optical Limiting of Black Phosphorus Nanosheets

This work reports the wavelength- and pulse-duration-dependent nonlinear optical properties of exfoliated black phosphorus (BP). We found that BP nanosheets exhibit better saturable absorption response in the visible range than that in the near-infrared range and better response under 6 ns pulse excitation than that under 340 fs excitation. In addition, we propose that the optically induced transparency and optical limiting properties of BP dispersions mainly originate from the competition between saturable absorption and nonlinear scattering.

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