Open AccessImaging by a sub-wavelength metallic lens with large field of view
Author(s) -
Shi Yin,
Chenyang Zhou,
Xiangang Luo,
Chunlei Du
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.16.002578
Subject(s) - optics , finite difference time domain method , lens (geology) , diffraction , aperture (computer memory) , focal length , cardinal point , electric field , wavelength , physics , numerical aperture , materials science , quantum mechanics , acoustics
The characteristics of the phase retardations and the invariability against the incident angles are investigated when light enters the rectangular holes with different sizes perforated on metallic film. A kind of metallic structure with a great potential in imaging is brought forward. The finite difference time domain (FDTD) method and the Rayleigh-Sommerfeld diffraction integrals are used to testify the imaging ability at different incident angles by examining the electric field on focal plane. The calculation results indicate that a quite large view of field lens can be achieved by increasing the number of the holes per unit area with the mentioned structure. A metallic structured lens with a 280 microm aperture and 240 microm focal length is designed and the view angle range of +/-15 degrees can be achieved.