The focusing performance of an aperiodic double layer metallic grating

Research output: Contribution to journalArticlepeer-review


  • Long Ma
  • Jie Lin
  • Peng Jin
  • Zhengang Lu
  • Jiubin Tan

Colleges, School and Institutes


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 languageEnglish
Pages (from-to)112-116
JournalMicroelectronic Engineering
Early online date2 Jun 2014
Publication statusPublished - 1 Jul 2014


  • Focusing performance, Aperiodic grating, Metallic subwavelength structure