Open AccessDirectional light beaming control by a subwavelength asymmetric surface structure
Author(s) -
DingZheng Lin,
Tsung-Dar Cheng,
Chin-Kai Chang,
Jyi-Tyan Yeh,
Jonq-Min Liu,
ChauShioung Yeh,
ChihKung Lee
Publication year - 2007
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.15.002585
Subject(s) - optics , diffraction , surface plasmon , finite difference time domain method , materials science , rigorous coupled wave analysis , diffraction grating , surface plasmon polariton , diffraction efficiency , plasmon , beam (structure) , substrate (aquarium) , surface (topology) , physics , oceanography , geology , geometry , mathematics
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.