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Terahertz Optical Properties of Ferrofluid
ZnTe-configured Terahertz time-domain spectroscopy
Terahertz Magneto-Optical modulator
Ferrofluid is a smart nanofluid that can be controlled using a magnetic field. Because the optical, thermal, and rheological properties of magnetic fluids can be precisely controlled, it is classified as a smart fluid. Its application in the industry includes leak-free sealing [1 ] , bearing lubricating fluid , there is magnetic force between the bearings so that the magnetic fluid can be perfectly covered between the bearings to achieve a leak-free sealed state and can reduce the friction between the bearings and this application is also spraying Ink printers have demonstrated excellent printing capabilities , and optically have successfully made good gratings  according to their excellent adjustment characteristics, and can also produce different wavelengths at different wavelengths for applying magnetic fields of different strengths. The optical filter used , in addition to its superior handling ability in biomedicine, Ferrofluid surfactants can also be paired with biomolecule bonds, such as: biosensors , medical diagnosis  ], Target therapy , etc. . With the development of network technology, I will study magneto-optic effect modulators that are rarely used in Terahertz to cope with the advent of the new Internet era. Since materials capable of generating magneto-optical effects under Terahertz need to be considered, I will use Fe3o4 The magneto-optical properties of the Ferrofluid produced under different parallel magnetic field intensities modulate Terahertz, and the refractive index changes caused by the magneto-optical effect produce effective modulation results for Terahertz waves. In this paper, a Terahertz time-domain spectroscopy system using a ZnTe crystal as a Terahertz emitter will be generated using a femtosecond laser with a high peak power to generate a Terahertz wave. The Terahertz wave will also be used as a Terahertz detector by ZnTe. Introduced into the sample center, and finally the Terahertz signal was received by the quarter wave plate and Wollaston prism to receive the light detector. The Terahertz wave passed the sample before and after the change to determine the transmittance of this sample in Terahertz. The refractive index and extinction coefficient of the sample were calculated based on the dispersion and amplitude changes of the Terahertz wave. In this study, a comparison was made between the hydrophilic Ferrofluid and the lipophilic Ferrofluid.
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