Continuous Wave Terahertz Signal Generator based on Difference Frequency Generation in Gallium Phosphide crystal and its applications for spectroscopy

Tetsuo Sasaki, Tadao Tanabe, Tomoaki Sakamoto, Jun Ichi Nishizawa

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

We have developed a wide frequency tunable Continuous Wave (CW) Terahertz (THz) Signal Generator (SG) on the principle of Difference Frequency Generation (DFG) in a Gallium Phosphide (GaP) crystal. The CW THz SG has the merits of high resolution, high accuracy, wide dynamic range, high stability, high durability, easy operation/maintenance, and low cost. Combining the CW THz SG as a light source with a superconducting Transition Edge Sensor (TES) bolometer cooled by a pulse tube refrigerator, the spectrometer working as a non-stop system could be realized. As we could have increased the THz output power up to 0.1 μW at the sacrifice of lack of frequency resolution, it is now possible to apply a pyroelectric detector or a bolometer camera at room temperature operation for spectrometer or monochromatic imaging. Accurate THz spectrometer could be used for evaluation of organic crystals like as pharmaceuticals. One of the reasons for underutilization of THz spectroscopy is that most of the absorptions observed in THz range are not assigned to vibrational modes. We have developed a technique to clarify them by comparing polarization dependent spectra with Density Function Theory (DFT) calculation results for pharmaceutical single crystals.

Original languageEnglish
Title of host publication2016 IEEE 11th Annual International Conference on Nano/Micro Engineered and Molecular Systems, NEMS 2016
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages600-603
Number of pages4
ISBN (Electronic)9781509019472
DOIs
Publication statusPublished - 2016 Nov 28
Externally publishedYes
Event11th IEEE Annual International Conference on Nano/Micro Engineered and Molecular Systems, NEMS 2016 - Sendai, Japan
Duration: 2016 Apr 172016 Apr 20

Publication series

Name2016 IEEE 11th Annual International Conference on Nano/Micro Engineered and Molecular Systems, NEMS 2016

Conference

Conference11th IEEE Annual International Conference on Nano/Micro Engineered and Molecular Systems, NEMS 2016
CountryJapan
CitySendai
Period16/4/1716/4/20

Keywords

  • Molecular Vibration
  • Pharmaceuticals
  • Terahertz Wave Signal Generator
  • THz Spectrometer

ASJC Scopus subject areas

  • Industrial and Manufacturing Engineering
  • Mechanical Engineering
  • Mechanics of Materials
  • Electronic, Optical and Magnetic Materials

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  • Cite this

    Sasaki, T., Tanabe, T., Sakamoto, T., & Nishizawa, J. I. (2016). Continuous Wave Terahertz Signal Generator based on Difference Frequency Generation in Gallium Phosphide crystal and its applications for spectroscopy. In 2016 IEEE 11th Annual International Conference on Nano/Micro Engineered and Molecular Systems, NEMS 2016 (pp. 600-603). [7758323] (2016 IEEE 11th Annual International Conference on Nano/Micro Engineered and Molecular Systems, NEMS 2016). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/NEMS.2016.7758323