Non-contact Millimeter Wave Dielectric Spectroscopy on Aqueous Solution

Inter-molecule and intra-molecule interaction in aqueous solution has important role on functionality of biomolecules such as proteins. These interactions can be probe with dielectric spectroscopic. Millimeter and THz range contains a rich amount of information of dielectric interactions in aqueous solution. In this work, we setup a millimeter wave quasi-optic dielectric spectroscopy system with high sensitivity and frequency resolution, and measured the complex dielectric spectrum of water and PBS+DTT buffer, which is two of most common background environments of biological sample.