학술논문
Metrology State-of-the-Art and Challenges in Broadband Phase-Sensitive Terahertz Measurements
Document Type
Periodical
Author
Source
Proceedings of the IEEE Proc. IEEE Proceedings of the IEEE. 105(6):1151-1165 Jun, 2017
Subject
Language
ISSN
0018-9219
1558-2256
1558-2256
Abstract
The two main modalities for making broadband phase-sensitive measurements at terahertz (THz) frequencies are vector network analyzers (VNA) and time-domain spectrometers (TDS). These measuring instruments have separate and fundamentally different operating principles and methodologies, and they serve very different application spaces. The different architectures give rise to different measurement challenges and metrological solutions. This article reviews these two measurement techniques and discusses the different issues involved in making measurements using these systems. Calibration, verification, and measurement traceability issues are reviewed, along with other major challenges facing these instrument architectures in the years to come. The differences in, and similarities between, the two measurement methods are discussed and analyzed. Finally, the operating principles of electro–optic sampling (EOS) are briefly discussed. This technique has some similarities to TDS and shares application space with the VNA.