Directional Light Beaming Control by a Subwavelength Asymmetric Surface Structure
Resource
Optics Express 15 (5): 2585-2591
Journal
Optics Express
Journal Volume
15
Journal Issue
5
Pages
2585-2591
Date Issued
2007-03
Date
2007-03
Author(s)
Lin, Ding-Zheng
Cheng, Tsung-Dar
Chang, Chin-Kai
Yeh, Ji-Tian
Liu, Jonq-Min
Yeh, Chau-Shioung
Abstract
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.
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