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Current issue   Ukr. J. Phys. 2014, Vol. 59, N 5, p.495-504

    Paper

Lyaschuk Yu.M., Korotyeyev V.V.

V.E. Lashkaryov Institute of Semiconductor Physics, Nat. Acad. of Sci. of Ukraine
(41, Nauky Ave., Kyiv 03028, Ukraine; e-mail: koroteev@ukr.net)

Interaction of a Terahertz Electromagnetic Wave with the Plasmonic System “Grating–2D-Gas”. Analysis of Features of the Near Field

Section: Solid matter
Original Author's Text: Ukrainian

Abstract: The theory of interaction between electromagnetic waves and a plasmonic structure consisting of the subwavelength metal grating locating over the layer of a two-dimensional (2D) electron gas has been developed. The frequency dependences of the transmission, reflection, and loss coefficients are shown to have a resonant behavior relating to the excitation of plasmons in the 2D gas. The influence of the geometrical and electrical parameters of the system on the plasmon resonance characteristics is studied, and the structure of an electromagnetic field in the near-field zone is analyzed. The spatial distributions of the electric field components, the electric power density, and the electromagnetic wave polarization are found. The plasmon resonance is shown to substantially increase the local concentration of the electric field in the near-field zone of the grating.

Key words: grating, near field, near-field zone, plasmonic system/structure, transmission, reflection, and loss coefficients, strip, circularly/elliptically polarized.