Abstract
We have studied the sensitivity and noise of optically gated dipole receivers made from ion implanted Si and GaAs in an optimized time domain THz spectrometer. The spectrometer uses a room temperature, dc biased, semi-insulating GaAs stripline source capable of generating up to 30 µW average power. The 10% amplitude system bandwidth for 10 µm (50 µm) dipole receivers is 3 THz (1.5 THz). A dynamic range of 4 × 105 Hz−1/2 is achieved using a 10 µm dipole GaAs receiver and 2 × 106 Hz−1/2 using a 50 µm dipole for a total laser power of 110 mW and THz beam power of 20 µW. The dynamic range achieved with comparable silicon receivers is a factor of 2 smaller.
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