Design and simulation of concentrator plasmonic nanostructure optical antenna to improve the performance of Li-Fi communication technology

The use of Li-Fi for the next generations of Internet of Things (IoT) and 6G networks can be very effective. Optical antennas (OAs) can generate a greater optical gain and a wider field of view (FoV). Therefore, they are very efficient in visible light communication (VLC). In this paper, we have studied a concentrator plasmonic nanostructured optical antenna that works in the visible wavelength. For this purpose, the impact of the shape and size of the plasmonic nanostructure was explored to enhance gain and improve the focusing of the optical antenna toward the detector's small surface. To increase the gain and improve the performance of the antenna, periodic nanostructures of comb teeth with varying sharpness and slope have been employed. The plasmonic nanostructures near the luminescent dielectric layer have formed a powerful electromagnetic field resonator and have increased the power up to three times in the optimal state. Moreover, the newly implemented optimal design has demonstrated an expanded FoV range. Consequently, this optical antenna has created a high data transmission rate by increasing the light cocentration.