APPLICATION OF CAPACITIVE MICROSTRUCTURES AS ANTI-ALIASING FILTERS FOR BROADBAND PULSED THZ SPECTROSCOPY
A. A. Rybak1,2, N. A. Nikolaev1, S. A. Kuznetsov2,3, Sh.-H. Yang4
1Institute of Automation and Electrometry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
2Novosibirsk State University, Novosibirsk, Russia
3Technological Design Institute of Applied Microelectronics, Novosibirsk, Russia
4Department of Electrical Engineering National Tsing Hua University, Hsinchu City, Taiwan
Keywords: импульсная терагерцовая спектроскопия, метаматериалы, частотно- избирательные поверхности, микроструктуры, теорема отсчётов, фильтры низких частот, полосовые фильтры, pulsed terahertz spectroscopy, metamaterials, frequency-selective surfaces, microstructures, counting theorem, low-pass filters, bandpass filters
Abstract
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
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