RESONANT PROPERTIES OF DIELECTRIC METALAYER

PACS numbers: 81.05.Xj, 78.67.Pt Subject and purpose: The resonant properties are studied of the dielectric metalayer in a form of a doubly periodic structure consisting of silicon parallelepipeds placed on a flat quartz substrate. Design/methodology/approach: Using the pseudospectral timedomain method, numerical simulations of electromagnetic plane wave scattering on the metalayer are made. Resonant properties of the metalayer were experimentally investigated by measuring frequency characteristics of a transmitted electromagnetic wave in a quasi-optical measuring waveguide within 52 to73 GHz. For experimental study, a sample of metalayer was made with the method of mechanical cutting of a layered silicon-quartz structure by a diamond disk. A peculiarity of the studied structure is a double-layer character of the array elements. Each element has a form of a parallelepiped and includes an upper silicon part and a bottom quartz part. A height of the upper part of parallelepiped was changed during the experimental study (the patterned silicon side of the metalayer was polished). Findings: A new technological design of metalayers providing an excitation of high-Q resonances is proposed. The resonances were found to be associated with forming of longitudinal electric or magnetic dipoles in elements of the array and in the substrate. The properties of these kinds of resonances depend on the height of the elements in different ways that allows to control the resonant properties of the structure by selecting the height of the silicon parts. Experimental studies have confirmed the properties of the magnetic dipole resonances predicted theoretically. Conclusions: Performed theoretical and experimental research efforts have demonstrated the opportunity to design all-dielectric resonant metalayers for terahertz applications. Key words: dielectric metalayer, periodic structure, silicon, quartz, transmission resonance, absorption resonance Manuscript submitted 22.12.2015 Radio phys. radio astron. 2016, 21(1): 65-76 REFERENCES 1. AYDIN, K., BULU, I., GUVEN, K., KAFESAKI, M., SOUKOULIS, C. M. and OZBAY, E., 2005. Investigation of magnetic resonances for different split-ring resonator parameters and designs. New J. Phys . vol. 7, id. 168. DOI: 10.1088/1367-630/7/1/168 2. FALCONE, F., LOPETEGI, T., LASO, M. A. G., BAENA, J. D., BONACHE, J., BERUETE, M., MARQUES, R., MARTIN, F. and SOROLLA, M., 2004. Babinet principle applied to the design of metasurfaces and metamaterials. Phys. Rev. Lett . vol. 93, no. 19, id. 197401. DOI: https://doi.org/10.1103/PhysRevLett.93.197401 3. KHARDIKOV, V.V., IARKO, E. O. and PROSVIRNIN, S. L., 2012. Agiant red shift and enhancement of the light confinement in a planar array of dielectric bars. J. Opt . vol. 14, no. 3, id. 035103. DOI: https://doi.org/10.1088/2040-8978/14/3/035103 4. KHARDIKOV, V. V., IARKO, E. O. and PROSVIRNIN, S. L., 2008, Using of transmission matrixes and pseudospectral method in time domain to investigate light diffraction on planar periodic structures. Radio Phys. Radio Astron . vol. 13, no. 2, pp. 146–158 (in Russian). 5. ZHAO, Q., ZHOU, J., ZHANG, F. and LIPPENS, D., 2009. Mie resonance-based dielectric metamaterials. Materials Today . vol. 12, is. 12, pp. 60–69. DOI: https://doi.org/10.1016/S1369-7021(09)70318-9 6. VAN DE GROEP, J. and POLMAN, A., 2013. Designing dielectric resonators on substrates: Combining magnetic and electric resonances. Opt. Express. vol. 21, is. 22, pp. 26285–26302. DOI: https://doi.org/10.1364/OE.21.026285 7. LAMB, J. W., 1996. Miscellaneous data on materials for millimeter and submillimetre optics. Int. J. Infrared Millimeter Waves . vol. 17, no. 12, pp. 1997–2034. DOI: https://doi.org/10.1007/BF02069487 8. KULESHOV, Y. M., 1986. Chapter 8. Measurements in sub-mm wavelength band. In: A. Y. USIKOV, ed. Electronics and Radio Physics of Millimeter and Sub-millimeter Waves . Kyiv: Naukova Dumka Publ., pp. 140–157 (in Russian). 9. The A.Y. Usikov Institute of Radio-Physics and Electronics of National Academy of Sciences of Ukraine, 2008. Quasi-optical radio measuring devices on the basis of a circular hollow dielectric beamguide of submillimeters and millimeters waves [online]. Available from: http://www.ire.kharkov.ua/depquasi/HDB.html