Application of Capacitive Microstructures as Anti-Aliasing Filters for Terahertz Time-Domain Spectroscopy

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Abstract

This paper first considers an approach based on the application of high-performance capacitive microstructures as anti-aliasing filters for low-frequency (sub-terahertz) measurements in terahertz time-domain spectroscopy. The approach was tested in measurements of 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 measurement accuracy due to the elimination of the long-term drift of the normalization signal. This approach is supposed to be used to increase the dynamic range and the spectrometer signal-to-noise ratio in the sub-terahertz region.

Original languageEnglish
Pages (from-to)101-108
Number of pages8
JournalOptoelectronics, Instrumentation and Data Processing
Volume56
Issue number1
DOIs
Publication statusPublished - 1 Jan 2020

Keywords

  • bandpass filters
  • frequency-selective surfaces
  • low-pass filters
  • metamaterials
  • microstructures
  • sampling theorem
  • terahertz time-domain spectroscopy
  • SPECTROMETER
  • SUBTERAHERTZ
  • METALLIC MESH
  • GENERATION
  • MESH INTERFERENCE FILTERS

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