Optimising a nantenna array at 1550 nm band

Abstract

The theoretical analysis and simulated design of a plasmonic equilateral triangular dielectric resonator nantenna fed via a 1 × 2 corporate feed network are presented. Utilising full wave electromagnetic simulation software Computer Simulation Technology (CST) Microwave Studio (MWS) and verifying results via high-frequency structure simulator, the working of the proposed nantenna at optical C-band (1.55 μm) is demonstrated and confirmed. Numerical results prove that the proposed nantenna exhibits a directivity of 9.57 dB with an impedance bandwidth of 2.58% (189-194 THz) covering the standard optical C-band transmission window. Furthermore, by selecting the appropriate orientation of the triangular dielectric resonators, the proposed nantenna structure can be tuned to operate at the higher or lower optical bands offering a threshold value of directivity and bandwidth Δf. By tuning the nantenna they achieve an increase in bandwidth of 4.96% (185.1-194.7 THz) and directivity also improves to 9.7 dB. The wideband and directive properties make the proposed nantenna attractive for a wide range of applications including broadband nanophotonics, optical sensing, optical imaging and energy harvesting applications.