Estudo de Nanoantenas Ópticas e aplicações em nanoenlaces eficientes

Abstract

In this work, a theoretical study is presented on the application of plasmonic nanoantennas in wireless optical nanolinks. The transmitting unit is driven by a Gaussian-beam source with a wavelength of 1153 nm. The transmitting antennas used in the links include a dipole antenna, a Yagi–Uda antenna, and a Yagi–Uda–loop antenna. The base structure of the Yagi–Uda–loop array consists of a dipolar radiator, a director element, three reflector elements, and a loop surrounding the dipole. The antenna modeling was carried out using the integral–algebraic solution of the radiation equations by means of the linear Method of Moments (MoM). For the isolated transmitting nanoantennas, the input impedance, current distribution, radiation pattern and near-field electric field were investigated. In the nanolinks analysis, three transmitter/receiver configurations were considered: Yagi–Uda–loop/dipole, Yagi–Uda/dipole and dipole/dipole. For each configuration, the power delivered to a load connected to the receiving antenna was evaluated as a function of the distance between transmitter and receiver. A performance comparison was also carried out with a bifilar optical transmission line (OTL) used as a wired link reference. The results show that the Yagi–Uda–loop/dipole nanolink exhibits an improvement of approximately 5 dB in power transmission compared to the dipole/dipole nanolink and 3.2 dB compared to the Yagi–Uda/dipole configuration. Furthermore, wireless nanolinks based on Yagi–Uda–loop, Yagi–Uda, or dipole antennas demonstrate superior performance compared to the wired link for distances greater than approximately 30 µm. Finally, the nanolinks were optimized through conjugate impedance matching, aiming to maximize power transfer to the load. The optimized nanolinks showed an average increase of approximately 4.1 dB compared to the non-optimized cases, with the Yagi–Uda–loop/dipole nanolink remaining the most efficient configuration.