Epsilon-near-zero material integrated trapezoid gold nanoantenna with wideband high absorption

In this paper, a new structure of nanoantenna has been designed, which uses a kind of Epsilon-Near-Zero (ENZ) material film (Indium Tin Oxide, ITO) and trapezoid metal to achieve high absorption (above 90%) effect for the incident light between 1310 nm and 1550 nm of the wavelength. The results have been put to the proof with the method of Finite Difference Time Domain (FDTD) Solutions. The nanoantenna we design can be applied to single photon detectors of which operating wavelength are 1310 nm or 1550 nm. Meanwhile, by tuning the carrier concentration of ITO, the operating range of the nanoantenna can be changed, which further upgrades the practicability of the nanoantenna.