Directional light beaming control by a subwavelength asymmetric surface structure

Ding Zheng Lin, Tsung Dar Cheng, Chin Kai Chang, Jyi Tyan Yeh, Jonq Min Liu, Chau Shioung Yeh, Chih Kung Lee

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)


We propose a direct experimental set-up to observe the directional beaming effect of surface plasmon. A single diffracted beam from an asymmetric-sided surface corrugation is demonstrated. A single subwavelength slit with an asymmetric structure was fabricated using a focused ion beam (FIB) onto a metal surface with a glass substrate. By means of surface plasmon (SP) diffraction, the directionality of the light can be changed by the period of the metallic gratings. We show corresponding numerical simulations achieved by a Rigorous Coupled-Wave Analysis (RCWA) method and a Finite-Difference Time-Domain (FDTD) method. The simulation results were in agreement with the experimental data.

Original languageEnglish
Pages (from-to)2585-2591
Number of pages7
JournalOptics Express
Issue number5
Publication statusPublished - 2007 Mar 5

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics


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