Beaming light from a subwavelength metal slit surrounded by dielectric surface gratings
Journal
Optics Express
Journal Volume
14
Journal Issue
8
Pages
3503-3511
Date Issued
2006
Author(s)
Lin, D.Z.
Chang, C.K.
Chen, Y.C.
Yang, D.L.
Lin, M.W.
Yeh, J.T.
Liu, J.M.
Kuan, C.H.
Yeh, C.S.
CHIEH-HSIUNG KUAN
Abstract
In this article, we demonstrate that a subwavelength metal slit surrounded by dielectric surface gratings possesses a directional beaming effect. We propose a surface plasmon diffraction scheme to explain the three kinds of beaming conditions. The numerical simulations of the illustrative structures undertaken used a Finite Difference Time Domain (FDTD) Method and a Rigorous Coupled Wave Analysis (RCWA) Method. Our simulations were found to be consistent and in agreement with the experimental results. In comparison with other metal structures, we find that dielectric metal structures offer better performance as well as the advantage of being able to be efficiently mass produced for large volume industrial applications.
SDGs
Type
journal article