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.
Bibliographical noteFunding Information:
This work was supported in part by the Brain Korea 21 Project , in part by the NRF grant funded by the MEST (Nos. 2010–0018442 , 2009–00479 EC-FP7/2007-2013 219299 GOSPEL , R15-2004-024-00000-0 , F01-2009-000-10200-0 , and 2009–00541 ), in part by the ITEP (Nos. 2009-8-0809 and 2010-8-1415 ), and in part by the ADD (Nos. 2010-8-1806 ).
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Physical and Theoretical Chemistry
- Electrical and Electronic Engineering