APPLICATION OF CAPACITIVE MICROSTRUCTURES AS ANTI-ALIASING FILTERS FOR BROADBAND PULSED THZ SPECTROSCOPY
An approach based on the application of high-performance capacitive microstructures as anti-aliasing filters in broadband pulsed terahertz spectroscopy in the case of low-frequency (sub-terahertz) measurements is considered for the first time. The approach was tested when measuring the spectra of reference samples - bandpass filters with central frequencies of 156 and 376 GHz and a bandwidth of 12 %. It is shown that the spectrometer measurement time is decreased by a factor of up to 12 with an improvement in the measurement accuracy by leveling the long-term drift of the normalization signal. It is supposed that this approach can be used to increase the dynamic range and the spectrometer signal-to-noise ratio in the sub-terahertz range