Optically Tuned Wide-Band Terahertz Modulation, Charge Carrier Dynamics and Photoconductivity of Femtosecond Laser Ablated Titanium Disulfide Nanosheet Devices

Based on femtosecond laser ablated processing, one-dimensional arrays with different line spacings were fabricated on titanium disulfide (TiS
₂
) nanosheet. Optical modulated measurements with these devices were demonstrated. Photo-induced complex conductivity changes of the TiS
₂
nanosheet devices were studied by an optical-pump THz-probe (OPTP) measurement system. For the 700 μm line spacing device, the optically introduced modulation depth (MD) reached up to 70%. Our experimental results have demonstrated the ultrafast dynamics and photoconductivity for the TiS
₂
nanosheet devices in the THz frequency range. TiS
₂
nanosheet based devices would be suitable as the photoelectric modulators of THz wave.