A quasi-optical testbed for wideband THz on-wafer measurements

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1 Scopus citations


We propose a novel quasi-optical topology to enable ultra-wideband on-wafer characterization in the THz regime. Using quasi-optical components, we implement a high-performance directional coupler and a noncontact probing scheme, to interrogate on-wafer devices and circuits. The use of quasi-optics allows superior signal isolation and wideband operation due to the frequency independent nature of focusing components. Additionally, the simple topology is amenable to integration with photonics-based THz emitters and detectors to enable a true THz testbed for vector measurement capabilities. A proof-of-concept testbed is designed and evaluated in the 300-340 GHz band using free-space and on-wafer measurements. The on-wafer characterization of passive devices shows good agreement with simulated results and repeatability of <2% for reflection coefficient magnitude and <4° for phase deviation.

Original languageEnglish (US)
Article number8620555
Pages (from-to)126-135
Number of pages10
JournalIEEE Transactions on Terahertz Science and Technology
Issue number2
StatePublished - Mar 2019


  • Quasi-optical
  • terahertz measurements
  • vector network analyzer (VNA)

ASJC Scopus subject areas

  • Radiation
  • Electrical and Electronic Engineering


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