Journal
JOURNAL OF OPTICS A-PURE AND APPLIED OPTICS
Volume 11, Issue 7, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1464-4258/11/7/075002
Keywords
surface plasmon polaritons; plasmonic nanolens; electromagnetic surface waves
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A novel plasmonic nanolens formed by two subwavelength metal slits surrounded by surface dielectric gratings is proposed and demonstrated numerically. In the proposed method, with just the regulation of the aperture, the radiation fields of surface plasmon polaritons (SPPs) can be controlled effectively. A method to regulate the focal length is also demonstrated. Numerical simulations using the finite-difference time-domain (FDTD) method coupled with perfect-matching-layer (PML) absorbing boundary conditions verify that the method is effective for the design of a plasmonic nanolens.
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