Abstract
We measured the transmission spectra of the most common hyperosmotic agents, such as pure glycerol, propylene glycol (PG), dimethyl sulfoxide (DMSO), polyethylene glycol (PEG) with molecular weights of 200, 300, 400, and 600 Da, their aqueous solutions, and aqueous solutions of sucrose, glucose, fructose, and dextran 40 and 70. The experiments were carried out using a THz pulsed spectrometer with an evacuated measuring compartment to eliminate the effect of water vapor on spectral measurements. We reconstructed the dielectric characteristics of hyperosmotic agents in the spectral range from 0.1 to 2.5 THz and plotted a dependence of the amplitude absorption coefficient on the concentration of the considered agents at a frequency of 0.5 THz. The results are useful for selecting optimal agents for immersion optical clearing in the THz range.
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