期刊
OPTICS COMMUNICATIONS
卷 284, 期 22, 页码 5388-5393出版社
ELSEVIER
DOI: 10.1016/j.optcom.2011.08.001
关键词
Subwavelength aperture; Bessel beam; Beam shaping; Surface plasmon polaritons
类别
A new method to generate a quasi-one dimensional (1D) Bessel-like beam whose non-diffracting length extends to macroscopic scale is proposed by utilizing highly directive transmission through a sub-wavelength single slit embedded in periodic metallic grooves. We employed finite-difference time-domain methods for full-vectorial diffraction and spectral analysis. In optimal conditions, unique quasi-1D Bessel-like beams were generated in transmission for the incident p-polarized plane wave such that highly asymmetric far-field distribution was achieved; Bessel-like beam along the slit axis and a flat-top super-Gaussian beam along the other perpendicular axis. Detailed parametric studies for the proposed structure are reported in terms of the operating spectral range and a general window of optimal conditions. (C) 2011 Elsevier B.V. All rights reserved.
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