Abstract
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.
Original language | English |
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Pages (from-to) | 112-116 |
Journal | Microelectronic Engineering |
Volume | 123 |
Early online date | 2 Jun 2014 |
DOIs | |
Publication status | Published - 1 Jul 2014 |
Keywords
- Focusing performance
- Aperiodic grating
- Metallic subwavelength structure