期刊
PLASMONICS
卷 11, 期 1, 页码 109-115出版社
SPRINGER
DOI: 10.1007/s11468-015-0029-9
关键词
Diffraction and gratings; Subwavelength structures; Multilayers; Surface plasmons
资金
- National Basic Research Program of China [2013CBA01704]
- Natural Science Foundation of China [61325023]
- Doctoral Fund of Ministry of Education of China [20130184110015]
A plasmonic lens with coupling annular grooves is proposed to achieve enhanced far-field focusing performance. Based on the finite difference time domain (FDTD) method, we demonstrate that a focal beam could be obtained under a radially polarized light illumination. The obtained focal length and working distance range from 3.1 to 3.6 mu m and 1.7 to 2.1 mu m, respectively. The full-width at half-maximum (FWHM) of the focal spot is about 0.8 lambda (i) and the overall field enhancement factor is improved to be similar to 3.9.
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