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- W4224252771 abstract "We report THz transmission and reflection properties of an ultrafast optically excited highly resistive silicon wafer. Amplified Ti:Sapphire femtosecond laser pulses at 800 nm were used to create fluence-dependent carrier density on the front surface of the wafer which modifies the dielectric properties at the THz frequencies. Time-resolved experiments in the optical pump-THz probe configuration were conducted in which THz pulses reflected off from the surface at 0° and 45° angles of incidence make it possible to measure the pump-fluence dependent ultrafast evolution of the reflection and transmission coefficients in 0.5-6 THz range. An analytical model, where both the Drude contributions from the photo-excited electrons and holes account for the change of the dielectric constant of the photo-excited silicon, has been used to evaluate the THz reflection and transmission coefficients at steady state. Thus obtained results match well with the experimental results and demonstrate an all-optical means to convert a silicon wafer into an ultrafast, tunable and broadband neutral density filter or reflector in the THz frequency range." @default.
- W4224252771 created "2022-04-26" @default.
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- W4224252771 date "2022-05-16" @default.
- W4224252771 modified "2023-09-26" @default.
- W4224252771 title "Ultrafast, broadband and tunable terahertz reflector and neutral density filter based on high resistivity silicon" @default.
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- W4224252771 doi "https://doi.org/10.1364/oe.456012" @default.
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