Metallo-dielectric Yagi-Uda nanoantennas based on rectangular shaped elements

Fatma E. Helmy; Mohamed Hussein; Mohamed Farhat O. Hameed; Ahmed Shaker; M. El-Adawy; S. S. A. Obayya

doi:10.1117/12.2509292

26 February 2019 Metallo-dielectric Yagi-Uda nanoantennas based on rectangular shaped elements

Fatma E. Helmy, Mohamed Hussein, Mohamed Farhat O. Hameed, Ahmed Shaker, M. El-Adawy, S. S. A. Obayya

Proceedings Volume 10912, Physics and Simulation of Optoelectronic Devices XXVII; 109121F (2019) https://doi.org/10.1117/12.2509292
Event: SPIE OPTO, 2019, San Francisco, California, United States

Abstract

In this paper, metallo-dielectric core-shell Yagi-Uda nanoantennas (NAs) are reported and optimized using 3D finite different time domain (FDTD) method and particle swarm optimization (PSO) technique to maximize the directivity. The suggested design has a silicon rectangular prism with spherical or rectangular silver core to improve the directivity and radiation efficiency. The proposed design with rectangular prism silver core achieves radiation efficiency of 77.23 % with a directivity of 18.41 at a wavelength of 500 nm. However, the directivity is increased to 21.22 with a radiation efficiency of 69.15 % with spherical-core based structure. The achieved enhancement is attributed to the elements shape in addition to the metallo-dielectric structure. Further, the silicon dielectric shell exhibits magnetic mode with high refractive index, as well as the surface plasmon mode supported by the silver core.

Citation Download Citation

Fatma E. Helmy, Mohamed Hussein, Mohamed Farhat O. Hameed, Ahmed Shaker, M. El-Adawy, and S. S. A. Obayya "Metallo-dielectric Yagi-Uda nanoantennas based on rectangular shaped elements", Proc. SPIE 10912, Physics and Simulation of Optoelectronic Devices XXVII, 109121F (26 February 2019); https://doi.org/10.1117/12.2509292

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