Terahertz DevicesNo Access

A 570-630 GHz FREQUENCY DOMAIN TERAHERTZ SPECTROSCOPY SYSTEM BASED ON A BROADBAND QUASI-OPTICAL ZERO BIAS SCHOTTKY DIODE DETECTOR

LEI LIU

Department of Electrical Engineering, University of Notre Dame, Notre Dame, IN 46556, USA

Search for more papers by this author

JEFFREY L. HESLER

Department of Electrical and Computer Engineering, University of Virginia, Charlottesville, VA 22904, USA

Search for more papers by this author

ROBERT M. WEIKLE, II

Department of Electrical and Computer Engineering, University of Virginia, Charlottesville, VA 22904, USA

Search for more papers by this author

TAO WANG

Department of Electrical Engineering, University of Notre Dame, Notre Dame, IN 46556, USA

Search for more papers by this author

PATRICK FAY

Department of Electrical Engineering, University of Notre Dame, Notre Dame, IN 46556, USA

Search for more papers by this author

, and

HUILI XING

Department of Electrical Engineering, University of Notre Dame, Notre Dame, IN 46556, USA

Search for more papers by this author

https://doi.org/10.1142/S0129156411006921Cited by:15 (Source: Crossref)

Abstract

We report a room temperature 570-630 GHz frequency domain terahertz (THz) spectroscopy system developed on the basis of a broadband quasi-optical zero bias Schottky diode detector. The detector is designed to cover the frequency range of 100 GHz to nearly 900 GHz. A responsivity of 300-1000 V/W has been measured, and the noise equivalent power (NEP) is estimated to be 5-20 pW/√Hz based on the measurements of similar detectors. For a prototype demonstration, the frequency domain THz spectroscopy system was operated within the region of 570-630 GHz using a VDI (Virginia Diodes, Inc.) frequency extension module (FEM) to provide the THz radiation. Mylar thin films with different thicknesses and THz metal mesh filters have been measured using this system, demonstrating a measurement accuracy of ~2%. This system has been applied to measure biomolecules in liquid-phase, and nano-material samples in solid-phase. Initial results and discussion are presented.

Keywords:

Remember to check out the Most Cited Articles!
Check out these Notable Titles in Antennas

References

E. R. Brownet al., IEEE Sensors Journal 10(3), 755 (2010). Crossref, Web of Science, Google Scholar
T. R. Globuset al., IEEE Sensors Journal 10(3), 410 (2010). Crossref, Web of Science, Google Scholar
A. Markelz and et. al., Chemical Physics Letters 320(42), (2000). Crossref, Web of Science, Google Scholar
N. Karpowiczet al., Semiconductor Science and Technology 20(7), S293 (2005). Crossref, Web of Science, Google Scholar
J. L. Hesler, L. Liu, H. Xu, and R. M. Weikle, II, "The development of quasi-optical THz detectors," 33rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW), Pasadena, California, USA, Sep. 2008 . Google Scholar
L. Liuet al., IEEE Microwave and Wireless Components Letters 20(9), 504 (2010). Crossref, Web of Science, Google Scholar
D. B. Rutledge, D. P. Neikirk and D. P. Kasilingham, Infrared and Millimeter Waves 10, ed. K. J. Button (Academic Press, New York, 1983) pp. 1–90. Google Scholar
D. F. Filipovic, S. S. Gearhart and G. M. Rebeiz, IEEE Trans. Microwave Theory & Tech. 41(10), 1738 (1993). Crossref, Web of Science, Google Scholar
J. L. Hesler, and T. W. Crowe, "Responsivity and noise measurements of zero-bias Schottky diode detectors," 18th Intl. Symp. Space Terahertz Techn., Pasadena, March 2007 . Google Scholar
D. Porterfieldet al., Applied Optics 33(25), 6046 (1994). Crossref, Web of Science, Google Scholar
L. Liu, T. Wang, A. Biswas, Z. Cai, F. Watanabe, A. S. Biris, M. Lieberman, G. H. Bernstein, H. Xing, and P. Fay, "Narrow Spectral Features of Cellulose Nanocomposites Characterized by a Frequency Domain Terahertz Spectroscopy," 18th Annual International Conference on Composites and Nano Engineering (ICCE), Anchorage, Alaska, USA, July 2010 . Google Scholar