DOI: 10.17586/2226-1494-2019-19-5-775-782


TUNABLE TERAHERTZ FILTERS BASED ON CARBON NANOTUBES

D. A. Gomon, V. Y. Soboleva, P. S. Demchenko, E. A. Litvinov, E. B. Sheklanova, M. K. Khodzitskiy


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Gomon D.A.,Soboleva V. Yu.,Demchenko P. S.,Litvinov E.A.,Sheklanova E.B.,Khodzitsky M.K.Tunableterahertzfilters based on carbon nanotubes. Scientific and Technical Journal of Information Technologies, Mechanics and Optics, 2019, vol. 19, no. 5, pp. 775–782 (in Russian). doi: 10.17586/2226-1494-2019-19-5-775-782



Abstract
Subject of Research. The paper presents the study of optically tunable terahertz filter based on cross resonators coated with a layer of carbon nanotubes (CNT). We show experimentally control capability of the optical spectral characteristics of terahertz devices coated with a layer of single-wall carbon nanotubes. Method. The empirical formulas were used for calculation of the geometrical parameters of a cross-shaped resonator for a given resonant frequency and filter Q-factor. Experimental samples of the notch filter were made by laser engraving. A layer of carbon nanotubes, which were synthesized by aerosol chemical deposition, was deposited on an experimental filter sample. Experimental transmission spectra of an “empty” filter, a filter with a carbon nanotubes layer without pumping, and an optically pumped carbon nanotubes layer filter at a wavelength of 980 nm were measured by terahertz time-domain spectroscopy. Main Results. We have shown by experiments that optical pumping of a filter with carbon nanotubes layer leads to a decrease in the transmittance of the main resonance peak and a shift towards higher frequencies of the side resonance peak. Practical Relevance. Filters coated with carbon nanotubes layer can be used as inexpensive and compact tunable components for terahertz photonics devices

Keywords: terahertz radiation, terahertz filters, metamaterials, carbon nanotubes, cross-shaped resonators, terahertz pulse spectroscopy

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