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Interaction of terahertz electromagnetic field with a metallic grating: Near-field zone
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Lyaschuk Yu. M. and Korotyeyev V. V.

Abstract. We have developed a theory for the interaction of THz radiation with a sub-wavelength metallic grating. The structure of electric field of the electromagnetic waves under the metallic grating has been studied for the near-field zone. Spatial distributions of the electric field components and the electric energy density have been obtained for the wave transmitted through the grating. An effect of strong local enhancement of the electric field has been detected. Spatial dependence of po-larisation of the transmitted wave has been analysed for the near-field zone. 

Keywords: terahertz radiation, near-field optics, plasmonics

PACS: 85.60.-q, 07.57-c, 42.25.Bs, 42.79.Pw
UDC: 537.874, 537.862
Ukr. J. Phys. Opt. 13 142-150
doi: 10.3116/16091833/13/3/142/2012
Received: 14.05.2012

Анотація. Побудовано теорію взаємодії ТГц-випромінювання з субхвильовою металічною ґраткою. Проведено дослідження структури електричного поля електромагнітної хвилі в близькій зоні цієї ґратки. Одержано просторовий розподіл компонент вектора електричного поля та густини електричного енергії електромагнітної хвилі, що пройшла крізь ґратку. Зазначено ефект істотного локального підсилення електричного поля. Проаналізовано просторові залежності поляризації електромагнітної хвилі в близькій зоні ґратки.
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