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- W2400100588 abstract "We present measurements of sub-bandgap photoconductivity and photoconductive switches using GaAs doped heavily with Er such that nanoparticles of ErAs are formed. In addition to strong resonant absorption centered around 1550 nm, the material provides strong sub-bandgap photoconductivity and >> μW average power levels when fabricated into an efficient (square spiral) THz antenna and driven by a 1550- nm ultrafast fiber laser. Photo-Hall measurements prove that the predominant photocarrier is the electron and the linearity of the 1550-nm photocurrent (with laser power) suggests that the photoconductivity is “extrinsic”, not other possible mechanisms, such as two-photon absorption. These results have immediate relevance to the use of GaAs:Er switches as the transmitter in 1550-nm-driven THz imaging systems such as the “impulse imager” that we have successfully used for biomedical imaging applications." @default.
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- W2400100588 date "2016-05-26" @default.
- W2400100588 modified "2023-09-23" @default.
- W2400100588 title "Evolution of THz impulse imaging radar to 1550nm photoconductive switches" @default.
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- W2400100588 doi "https://doi.org/10.1117/12.2224919" @default.
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