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This paper presents a significant effect of manganese ferrite nanoparticles (MnFe 2 O 4  NPs) on the increase of the surface photoconductivity of semiconductors. Herein, the optical characterization of photo-excited carriers of silicon coated with MnFe 2 O 4  NPs was studied by using THz time-domain spectroscopy (THz-TDs). We observed that silicon coated with MnFe 2 O 4  NPs provided a significantly enhanced attenuation of THz radiation in comparison with bare silicon substrates under laser irradiation. The experimental results were assessed in the context of a surface band structure model of semiconductors. In addition, photoconductive antennas coated with MnFe 2 O 4  NPs significantly improved the efficiency of THz radiation generation and signal to noise ratio of the THz signal. This work demonstrates that coating with MnFe 2 O 4  NPs could improve the overall performance of THz systems, and MnFe 2 O 4  NPs could be further used for the implementation of novel optical devices.

Enhanced Terahertz Radiation Generation of Photoconductive Antennas Based on Manganese Ferrite Nanoparticles