Directional light beaming control by a subwavelength asymmetric surface structure.
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.
Lin
Ding-Zheng
DZ
Cheng
Tsung-Dar
TD
Chang
Chin-Kai
CK
Yeh
Ji-Tian
JT
Liu
Jonq-Min
JM
Yeh
Chau-Shioung
CS
Lee
Chih-Kung
CK