Nanoantenna with electrically tunable radiation pattern

Abstract

In this article, an electrical approach is proposed for the purpose of tuning and beamforming of the radiation pattern of the nanoantenna. Interestingly, the main lobe direction of nanoantenna can be controlled and formed in a certain solid angle. The simulated results can be extremely useful in medical applications. In fact, we suggest a mechanism based on DC contacts as external sources, which are positioned around a nanostructure. On this basis, the main beam of the radiation pattern has the potential to turn with applying a DC voltage to each one of the contacts. In other words, the variation of DC voltage in contacts helps to rotate the radiation pattern of nanoantenna in a specific direction. The considered configuration as a nanoantenna is a core–shell spherical particle, which is composed of Silica and Gold. Moreover, the arrays of core–shell nanoantenna on the silver substrate and even without that are investigated. As a particular result, beamforming occurs by means of changing the DC voltage of contacts in the mentioned configuration of the core–shell nanoantenna. The operation frequency of all structures is equal to 550 THz (545 nm) as well.