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We present a development of a high precision, tunable far-infrared(terahertz) frequency-domain dielectric spectrometer for studying the dynamicsof biomolecules in aqueous solutions in the gigahertz-to-terahertz frequency.As a first application we report on the measurement of the absorption andrefractive index for liquid water in the frequency range from 5 GHz to 1.12 THz(0.17 to 37.36 cm-1 or 0.268 to 60 mm). The system provides a coherentradiation source with a power up to 20 mW in the gigahertz-to-terahertz region.The power signal-to-noise ratio of our instrument reaches 1015 and the systemachieves a spectral resolution of less than 100 Hz. The temperature of samplescan be controlled precisely with an error bars of 0.02 oC from above 0 oC to 90oC. Given these attributes, our spectrometer provides unique capabilities forthe accurate measurement of even very strongly absorbing materials such asaqueous solutions.

New terahertz dielectric spectroscopy for the study aqueous solutions