Volume 116, Number 5, December 2016
|Number of page(s)||6|
|Section||Physics of Gases, Plasmas and Electric Discharges|
|Published online||01 February 2017|
Enhancement of focusing properties by interfering spatial bending beams
1 School of Physics and Information Technology, Shaanxi Normal University - Xi'an 710062, China
2 Division of public infrastructure, De-hong Vocational College - Mang-shi 678400, China
Received: 7 December 2016
Accepted: 10 January 2017
In this study, two slits were designed symmetrically on a metal film to excite surface plasmon polaritons (SPPs), and two groups of parallel dielectric rectangles were designed over a metal film to convert the SPPs into double mirror-symmetric spatial bending beams. The high-energy far-field focused beams were achieved by interfering double mirror-symmetric spatial bending beams using the finite-element method The focusing properties of the proposed structure are enhanced compared with the conventional metal grating structures. Furthermore, the effects of the structural parameters on the focusing properties were investigated Results show that the focusing properties of the proposed structure rely on the structural parameters of dielectric rectangles and on the distance between the dielectric rectangles and the metal film. The position of the focusing spot relies on the distance between two slits. These findings can be applied in the fields of biology imaging, nanolithography, optical data storage and photo-biomedical detection.
PACS: 52.40.-w – Plasma interactions (nonlaser) / 52.25.Fi – Transport properties / 52.35.Hr – Electromagnetic waves (e.g., electron-cyclotron, Whistler, Bernstein, upper hybrid, lower hybrid)
© EPLA, 2016
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