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Using the effective medium model, the complex permittivity of the ocular surface system in the THz frequency range is considered. The penetration depth of THz radiation and the sensitivity of the reflected component to the dynamics of evaporation of the tear film are discussed. The results of in vivo experiments aimed to determine the reflection coefficient of the ocular surface using continuous THz reflectometers are well described using the developed model.

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Based on regular porous polymeric membranes, the synthesis ofmetal and dielectric spearhead structures with given morphologicalcharacteristics was carried out. Copper structures with the ~1 μm height and dielectric spearhead microstructures made from iodicacid with the 12 μm height and 1 μm diameter were obtained. Thepossibility is discussed of using such optical elements to solve theproblems of increasing the efficiency of IR radiation detection, signalamplification and conversion to visible and near-infrared ranges. Keywords: regular membranes, spearhead structures, copper, iodic acid, radiation transformations.\