Efficient coupling and field enhancement for the nano-scale: plasmonic needle.
Theoretical demonstration of efficient coupling and power concentration of radially-polarized light on a conical tip of plasmonic needle is presented. The metallic needle is grown at the center of radial plasmonic grating, engraved in a metal surface. The electromagnetic field distribution was evaluated by Finite Elements and Finite-Difference-Time-Domain methods. The results show that the field on the tip of the needle is significantly enhanced compared to the field impinging on the grating. The power enhancement exhibited a resonant behavior as a function of needle length and reached values of approximately 10(4). Test samples for few types of characterization schemes were fabricated.
Normatov
Alexander
A
EE department, Technion - Israel Institute of Technology, Technion City, Haifa, Israel.
Ginzburg
Pavel
P
Berkovitch
Nikolai
N
Lerman
Gilad M
GM
Yanai
Avner
A
Levy
Uriel
U
Orenstein
Meir
M
D004574:Electromagnetic Fields; D008027:Light; D008962:Models, Theoretical; D049329:Nanostructures; D036103:Nanotechnology / Q000295:instrumentation*; D020349:Surface Plasmon Resonance / Q000295:instrumentation*