| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 539406 | Microelectronic Engineering | 2014 | 5 Pages |
Abstract
•An aperiodic double layer metallic grating is designed.•A subwavelength and long depth of focus focal spot is achieved.•Focusing performance is insensitive to alignment errors between layers.
In this paper, a double-layer aperiodic metallic grating is designed and the focusing performance is numerically researched using the finite-difference time-domain method. A sub-wavelength focusing spot is achieved and the depth of focus is twice the length of the incident wavelength. With its ease of fabrication, the designed aperiodic double-layer metallic grating has great potential in applications such as data storage, laser direct writing and optical probe.
Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slide
Keywords
Related Topics
Physical Sciences and Engineering
Computer Science
Hardware and Architecture
Authors
Long Ma, Jie Lin, Peng Jin, Phil Prewett, Zhengang Lu, Jiubin Tan,