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Through the application of terahertz spectroscopy and imaging to the analysis of art, we have developed a spectral database of art materials containing more than 200 spectra of various pigments and binders. With this database, a red ink used in a thirteenth-century manuscript was identified; the results were verified by X-ray fluorescence elements mapping. Terahertz transmission spectral component...
We have developed widely tunable THz-wave parametric generators that operate at room temperature. On the other hand, THz-waves continue to broaden their range of applications in our laboratory such as detection of drugs concealed in envelopes, and inspection of electrical failures in large scale integration circuit.
We report on a sensing method in the terahertz range using metallic mesh (MM). Conventionally, the filter property of an MM can be changed by the geometrical parameters of the MM. Considering that this property is also changed when the medium in the vicinity of the mesh openings has a different permittivity, we were able to measure small amounts of absorbing materials and thin plastic films on the...
We are studying several novel steps toward real-life applications of terahertz waves, such as, i) palmtop terahertz-wave parametric generators, ii) printable terahertz sensors using metal mesh, iii) noninvasive detection of concealed drugs using terahertz wave scattering, iv) observation of MOSFET chips using an infrared laser THz emission microscope, v) monolithic Fabry-Perot resonator for the measurement...
We have developed a novel basic technology for terahertz imaging; which allows detection and identification of drugs concealed in envelopes, by introducing the component spatial pattern analysis. The spatial distributions of the targets are obtained from terahertz multispectral transillumination images, using absorption spectra measured with a tunable terahertz-wave source. The samples we used were...
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