Open AccessOptimization and analysis of the structural parameters of subwavelength metal focusing lens
Author(s) -
Min Li,
Zhiyou Zhang,
Shi Sha,
Jinglei Du
Publication year - 2010
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.59.958
Subject(s) - lens (geology) , optics , groove (engineering) , focal length , materials science , focus (optics) , depth of focus (tectonics) , physics , paleontology , subduction , biology , metallurgy , tectonics
The methods for improving the focusing properties of subwavelength metallic lens by optimizing the groove width and depth of the structure simultaneously are presented. We investigate how the variations of the width and depth of the groove affect the half width at half maximum of the focus, intensity, normal focusing efficiency of the focal spot and the focal length, based on the finite-difference and time-domain method. The optimum design methods of metal lens are put forth through discussing the focusing regularity and physical mechanism, which can provide a theoretical basis for realizing the nano-focusing and flexible manipulation of light wave based on metallic lens.