Abstract
In this paper, an active 2D plasmonic lens has been carefully designed to achieve intensity beam modulation. The design has been thoroughly studied by using rigorous finite element method (FEM). Combination of silicon oxide (SiO2), nematic liquid crystal (NLC) layer and array of non-uniform nano-scale golden (Au) rods along with finely optimized geometry paved the way to achieve good modulation intensity in terms of extinction ratio of about 3.5 dB. Further, the tolerance analysis reveals that the performance of the suggested intensity-modulation lens is almost unchangeable with ± 15 nm variation in the nano-scale golden rods dimensions. Additionally, the proposed lens has been examined using different noble metals such as silver (Ag) and Aluminum (Al). In comparison with other reported lenses, the proposed lenses based Ag, Al and Au have relatively smaller dimensions, maximum intensity amplification factors of about 10.4, 16.6 and 12.5; respectively. The proposed lens may render itself as an efficient unit in the ultra-high nano scale integrated optical systems.
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