Abstract

In this Letter, we successfully introduce a long-lived non-radiative photocarrier decay component in a Dirac semimetal ${\mathrm{Cd}}_3{\mathrm{As}}_2$ thin film via Mn doping. The long-lived decay component is found to vary between 200 ps and 2.8 ns with different Mn concentrations and probing wavelengths. Most remarkably, the elongated transients persist over the important mid-infrared wavelengths (observed up to 4 μm). Saturable absorption measurement reveals stronger modulation effects for long-width pulses ($\sim 80\mathrm{ps}$) from the Mn-doped samples. Our results provide new insights into the effect of transition-metal doping on the ultrafast optical properties of Dirac semimetal ${\mathrm{Cd}}_3{\mathrm{As}}_2$ and establish ${\mathrm{Cd}}_3{\mathrm{As}}_2$ as a highly amendable material for mid-infrared photonic applications.

© 2019 Optical Society of America

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