Abstract
We designed plasmonic lenses and analyzed their chromatic aberration
using the finite element method (FEM) in frequency domain with perfectly matched
layers (PML). Plasmonic lenses permit subwavelength focusing of light in the
visible and in the near infrared. The focal distance of these devices depends
on the wavelength operation due to the dispersive characteristics of the lens
structures and the refractive index of their constituent materials. With a
uniform incident wave normal to the lens surface, focusing of light by surface
plasmon polariton (SPPs) through a plasmonic lens is obtained in the axial
direction. The design of three plasmonic lenses in Silver (Ag), Gold (Au)
and Copper (Cu) films at two central operation wavelengths of 650 nm and 810
nm, in both, cylindrical and rectangular geometries were considered and the
chromatic aberration of the lenses were analyzed by monitoring the peak position
of the electromagnetic (EM) field when the wavelength changes from 625 nm
to 675 nm and from 785 nm to 835 nm..
© 2013 IEEE
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