Open AccessImproved image quality of a Ag slab near-field superlens with intrinsic loss of absorption
Author(s) -
Kwangchil Lee,
Haesung Park,
Jae-Hoon Kim,
Gumin Kang,
Kyoungsik Kim
Publication year - 2008
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.16.001711
Subject(s) - superlens , optics , finite difference time domain method , materials science , slab , absorption (acoustics) , image quality , wavelength , near and far field , permittivity , visibility , electric field , refractive index , optoelectronics , physics , dielectric , image (mathematics) , artificial intelligence , geophysics , computer science , quantum mechanics
Intrinsic loss of absorption in the Ag slab near-field superlens turned out to add a blurring effect to the ideal image reconstruction for the impedance match case. By optimizing the real part of the permittivity (epsilon') of Ag, our FDTD calculation predicts approximately 69% enhancement of visibility and approximately 138% increased depth of field for the intensity contrast of 0.5 with similar focal spot size. For a near-field superlens with the higher absorption loss, the optimized image quality is obtained with a larger impedance mismatch, which can be realized by changing the wavelength of incident light for imaging.