META 2021, META'12

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Low-diffraction beaming in plasmonic crystals
V. A. Podolskiy, S. Inampudi, I. Smolyaninov

Last modified: 2012-01-03


We analyze the propagation of electromagnetic modes guided by the periodic plasmonic structures, such as those experimentally studied in Science 317, 1699 (2007). Full-wave solutions of Maxwell equations are used to numerically derive the dispersion of the guided modes. The validity of low-scattering approximation is analyzed and analytical expression for the dispersion in low-scattering periodic plasmonic structures is derived. For selected frequency regions that are determined by the geometry, diffraction of guided modes is strongly suppressed, leading to formation of low-diffraction beams, previously observed in experiments.