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We demonstrate measurement of material optical parameters, in the THz regime, by mounting the sample under test on a spinning wheel. The proposed measurement technique is implemented using double-modulated terahertz differential timedomain spectroscopy (double-modulated THz-DTDS). Spinning sample addresses fundamental limitations imposed by linear sample dithering. The concept of spinning the sample...
The conventional double-modulated terahertz differential time-domain spectroscopy (double-modulated THz-DTDS) of liquids requires linear dithering of the sample to rapidly vary the sample thickness in order to produce the required sample and reference signals. Linear dithering, however, imposes a fundamental limitation as it introduces mechanical noise into the system, thereby contributing to measurement...
The ability to detect and recognise a variety of gases under certain environmental conditions has significant potential impact in many areas. Gas sensing has long received attention with microwave and infrared spectroscopy. With many molecular resonances occurring in the THz range leading to simple, unique spectral features, THz time domain spectroscopy (TDS) shows promise as a tool for gas detection...
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