摘要A beam optical focusing structure with double subwavelength metal slits surrounded by tapered surface dielectric gratings is proposed and demonstrated numerically. In the proposed structure, just with the regulation of the surface gratings, the radiation fields of surface plasmon polaritons (SPPs) can be controlled effectively to make a beam spot at several times the wavelength distance from the slit. Two methods for the control of focal length and width are proposed, and the simulation results verify that both the methods are effective for the design of nano-optical focusing devices.
Abstract：A beam optical focusing structure with double subwavelength metal slits surrounded by tapered surface dielectric gratings is proposed and demonstrated numerically. In the proposed structure, just with the regulation of the surface gratings, the radiation fields of surface plasmon polaritons (SPPs) can be controlled effectively to make a beam spot at several times the wavelength distance from the slit. Two methods for the control of focal length and width are proposed, and the simulation results verify that both the methods are effective for the design of nano-optical focusing devices.
(Optical properties of bulk materials and thin films)
引用本文:
ZOU Da-Qing;JIANG Jian-Li;LI Xiang-Yin. Beam Adjustment with Double Subwavelength Metal Slits Surrounded by Tapered Dielectric Gratings[J]. 中国物理快报, 2010, 27(1): 17801-017801.
ZOU Da-Qing, JIANG Jian-Li, LI Xiang-Yin. Beam Adjustment with Double Subwavelength Metal Slits Surrounded by Tapered Dielectric Gratings. Chin. Phys. Lett., 2010, 27(1): 17801-017801.
2010, Vol. 27 
