Drag-laden magnetic nanoparticles can deliver drugs to a zone of ischemic damage for various purposes of clinical medicine. THz spectroscopy of nanoparticles with adsorbed organic and biological molecules could enable estimation of drug delivery efficiency of the nanoparticles sample and curative effect of delivering chemical substance. The first task of this work was to simulate the contribution of nanoparticles and the shell of organic molecules (glycose) to the dielectric properties of the pressed pellets, consisting of the polyethylene and nanoparticles. The second task of this paper was to study experimentally the possibility of using terahertz radiation for spectral diagnosis of NPs based on iron oxide in a biologically inert shell of silicon dioxide drug-laden with a glycose.
Pulse holographic imaging along with time-domain spectroscopy scan and tomographic techniques are of great interest. Since the advantages of holography are the lack of focusing optics and high spatial resolution, and, comparing with tomography, less computation cost for numerical reconstruction, this technique is preferable for the analysis of thin histological samples. In this work we have created the experimental scheme that involves measurement of diffraction pattern of the collimated THz pulse field spatial distribution at some distance behind the object in the time-domain mode, thus allowing reconstruction of amplitude and phase distribution at the object plane by numerical backpropagation of the wavefront in the spectral domain. In our experiment, we used a breast biopsy sample containing cancer tissues, we also performed numerical simulations accounting for experimental conditions to confirm the conceptual applicability of the reconstruction method.
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