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Ultrafast photoconductive switches were fabricated from GaAs embedded with ErAs nanoparticles and tested in two antenna types: a self-complementary square spiral, and a slot antenna designed for half-wave resonance at 567 GHz. These devices are designed for driving with 1550nm lasers. At least ∼46 μW of THz average power was generated from the spiral, and ∼5 μW from the resonant slot. This is the...
A model is constructed for extrinsic photoconductivity in GaAs heavily doped with Er and driven around 1550 nm. The model is based on internal photoionization of ErAs nanoparticles in the diameter range 2.0 to 2.5 nm, which occurs via a resonant, bound-to-continuum electron transition between the Γ-point in the atomic-like ErAs and the Γ-valley in the GaAs. The model is consistent with all experimental...
We present a simple cross-calibration procedure for measuring THz power with room-temperature pyroelectric detectors. When efficiently coupled, large-area, metal-film-coated lithium tantalate pyroelectric detectors are perfectly capable of detecting microwatt average power levels or less from THz sources, pulsed or cw. Here we focus on a brass flared-horn coupling technique that increases the pyroelectric...
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