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The properties of new porous materials made from nanostructured alumina oxyhydroxides (NAO) were studied in terahertz range. Analysis of the experimental results obtained with the raw , annealed, and chemically modified NOA samples show potential application of such materials for development light driving terahertz devices in the form of photonic band gap (PBG) and low loss holey waveguides. We report the results of THz-TDS detection of adsorbed molecular layers at the NAO surface.