Journal
PLASMONICS
Volume 6, Issue 2, Pages 269-272Publisher
SPRINGER
DOI: 10.1007/s11468-010-9199-7
Keywords
Plasmonic lens; Metallic nanostructure; Focusing in the optical regime
Funding
- Agency for Science and Research (A*Star), Singapore, SERC [072 101 0023]
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We propose a plasmonic wavelength-launched Fresnel zone plate structure for subwavelength focusing. The plasmonic structure consists of a central circular groove surrounded by 12 transparent and opaque zones. All the zones with widths smaller than one half of the incident wavelength are used to enhance the field of evanescent waves in the transmission. Based on the finite-difference time-domain analysis, a focus spot with a full-width at half-maximum of 270 nm (= 0.4 lambda (in) ) can be achieved, accompanied by a largely reduced depolarization effect. The sharp waistline indicates that the surface waves are largely converged in the region of focus.
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