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THz time domain spectra of Bi4Ge3O12 (BGO) crystal were measured. The refractive index and power absorption function and optical dielectric function were obtained. The time domain spectrum shows resonance characteristic. There was one strong absorption band in the range of 1.5-2.3 THz. And the refractive index exist abnormal dispersion in the range. The time domain spectra characteristic of photon-phonon...
The absorption and refractive index of ellagic acid in the range of 0.2-2.4 THz have been measured by THz-TDS. It is found that the ellagic acid has the fingerprint absorption in this frequency region. The vibration absorption spectrum of the single molecule of ellagic acid between 0.2 and 2.4 THz is simulated based on the Density Functional Theory (DFT). THz absorption at low frequencies is attributed...
Terahertz (THz) transmission spectrum of metallic slit array is studied by means of terahertz time-domain spectroscopy. Frequency-selective transmission at terahertz frequencies of metallic slit array is shown experimentally and analyzed by numerical simulation. Two kinds of metallic slit array, the rectangular slits and the fractal slits, is investigated respectively. The results illustrate that...
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