Unidirectional surface plasmon polariton excitation at asymmetrical periodic metallodielectric multilayers

A. Roszkiewicz; W. Nasalski

doi:10.1117/12.921798

1 May 2012 Unidirectional surface plasmon polariton excitation at asymmetrical periodic metallodielectric multilayers

A. Roszkiewicz, W. Nasalski

Proceedings Volume 8424, Nanophotonics IV; 842426 (2012) https://doi.org/10.1117/12.921798
Event: SPIE Photonics Europe, 2012, Brussels, Belgium

Abstract

A new configuration of the one-dimensional reflective asymmetrical metallodielectric grating structure for unidirectional excitation of surface plasmon polaritons (SPPs) is proposed. The structure is embedded between two different dielectric media and composed of two 1D metallic gratings each of the two consisted of periodically placed rectangular metal stripes. The case of normal incidence is analysed. It is shown that even a small horizontal shift between these two layers or a change in dielectric contrast of the grating fillings, the structure may redirect an energy flow of the SPP in the near field. An explanation of this unidirectional SPP excitation is given. Besides the SPP excitation by a plane wave, the excitation by a finite-diameter 3D Gaussian beam is analysed as well, as the beam facilitates visualisation of the SPP finite propagation length and efficiency of the directivity switch. It is shown that the switching phenomenon exists together with a high concentration of the electromagnetic field at the structure, the feature especially desirable in techniques of subwavelength nanovisualisation. The configurations analysed may be also useful in designing optical devices as optical switches, VLSI devices, light harvesting photodetector structures or, in general, in any case where efficient control of energy propagation directivity is of primary importance.

Citation Download Citation

A. Roszkiewicz and W. Nasalski "Unidirectional surface plasmon polariton excitation at asymmetrical periodic metallodielectric multilayers", Proc. SPIE 8424, Nanophotonics IV, 842426 (1 May 2012); https://doi.org/10.1117/12.921798

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