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Abstract:
In this paper using FDTD-method, we conduct a comparative modeling of a sharp focus of the laser light by using binary-phase and binary-amplitude Fresnel zone plates, with the latter being fabricated as thin metal films of 20-30-nm thickness. Subwavelength local maximums are found near the rings of the silver zone plates, with their intensity being comparable with the intensity in the focus. They can be explained by the excitation of surface plasmons.

Keywords:
amplitude zone plate, phase zone plate, frequency dispersion, sharp focus, FDTD method.

Citation:
Kozlova ES, Kotlyar VV, Nalimov AG. Comparative modeling of amplitude and phase zone plates. Computer Optics 2015; 39(5): 687-93. DOI: 10.18287/0134-2452-2015-39-5-687-693.

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