Performance Evaluation of a Novel Plasmonic Butterfly-type Nanoantenna: Optical and Far-field Properties

In this paper, the design of a novel butterfly-shape antenna (patent pending) over the 0.1-10 THz frequency range is proposed. The antenna consists of two simmetric gold arms with a lenght of 46.48 μm, a width of 22.40 μm, and a thickness of 200 nm gold separated by a gap of 20 nm. The two-layer substrate is composed of 3 μm of silicon and 50 nm of gold. Simulation results, carried out by CST Studio Suite 2023, show three different resonant frequencies at 2.1 THz, 3.6 THz, and 5.1 THz, respectively, with a -10 dB S 11 lower than -18 dB for each resonant frequency and a directivity up to 11.04 dBi. Starting from the design of a single butterfly-nanoantenna, a 2x2 array is simulated and fabricated.