Influence of Grating Parameters on the Field Enhancement of an Optical Antenna under Laser Irradiation

Subject Areas : Journal of Optoelectronical Nanostructures

Mohammad Reza Mohebbifar ¹ , Mehdi Zohrabi ²

1 - Department of Physics, Faculty of Science, Malayer University, Malayer, Iran
2 - Department of Optics and Nanophotonics, Institute of Physics, Kazan Federal University, Kazan, Russia

Received: 2019-08-16 Accepted : 2019-10-02 Published : 2019-12-01

Keywords: Surface Plasmon, Optical Antenna, Localized Plasmon, Particle Swarm Optimization (PSO), Gold Tip, Field Enhancement,

Abstract :

In this study, a new approach for simulation of electric field enhancement of
plane wave laser around optical antenna was used to convert free-propagating optical
radiation to localized energy. A tapered gold tip design as a novel geometry of optical
antenna is introduced and numerically analyzed based on particle swarm optimization
(PSO) by solving the Maxwell equations with FDTD simulation Lumerical Software.
Five simulation stages of grating parameters to reach the maximum output intensity at
the gold tip hot spot were performed with 90° laser incident angle. The optimal values
of the grating period “a”, distance of the last circular grating from tip apex “b”, depth of
etched grating “T” and duty cycle of grating “D.C” were obtained a=262.2 nm, b=759.5
nm, T=30.1 nm, and D.C.=0.31 respectively. By using these optimal parameters for the
gold tapered tip with a cone angle of 30° at room temperature, the maximum output
intensity (|Emax|2) at the hot spot was obtained 52.4751.

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