Investigation of terahertz time-domain spectroscopy using terahertz superfucusing effect

2015 Fiscal Year Final Research Report

• Project/Area Number: 25410006
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Physical chemistry
• Research Institution: University of Fukui
• Principal Investigator: Yamamoto Kohji 福井大学, 遠赤外領域開発研究センター, 准教授 (70432507)
• Co-Investigator(Renkei-kenkyūsha): SHIOJIMA Kenji 福井大学, 工学研究科(研究院), 准教授 (70432151)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: テラヘルツ / 導波路 / 遠赤外

Outline of Final Research Achievements

We have investigated the feasibility of minute-sample terahertz spectroscopy using a metal parallel-plate waveguide with tapered-structure. We carried out terahertz time-domain spectroscopy of L,L-cystine, powdered samples of which were diluted with hydrocarbon-based grease. These mixed samples were sandwiched between metal parallel plates with several hundred-micrometer gap in the THz transmission measurements. We observed both of the sharp absorption peak and the dispersion feature of the refractive index of L,L-cystine at 24 cm-1. We found that background feature of powdered samples in THz absorption spectra possibly due to THz wave scattering was reduced by diluting the samples with the grease. We also obtained the quantitative THz spectra of L,L-cystine in the absorption coefficient spectrum. We succeeded in THz measurements of one-order of magnitude smaller sample of L,L-cystine relative to the sample amount necessary for the traditional terahertz measurements.

Free Research Field

物理化学