Realizing PIT-like transparency via the coupling of plasmonic dipole and ENZ modes

Abstract

Plasmon induced transparency (PIT), known as the coupling of plasmon modes in metamaterials, has attracted intensive research interests in photonic applications. In this work, a PIT-like transparency is realized via the strong coupling of plasmonic dipole and epsilon-near-zero (ENZ) mode. Two types of metasurfaces, namely the gold nanoantenna and dolmen-like metasurface, are designed with an integrated ENZ material aluminum doped zinc oxide (AZO) film. Simulations with the finite element method (FEM) demonstrate that single and double transparent windows are achieved respectively. The adjustments of the peak position and transmittance of transparent windows via the structure parameters and the AZO film thickness are further investigated. This work provides an alternative coupling scheme of realizing PIT-like transparency with simple metasurface design, and offers great potential for future metamaterial applications.

Epsilon-near-zero material-based bi-layer metamaterials for selective mid-infrared radiation

“…Previous research has shown that the planar ENZ film exhibits typical angular dependence. 37 Oblique incidence and insensitive polarization are frequently necessary in the application of MIR radiation materials. As shown in figures 4(c) and (d), for TM polarization, as the incident angle reaching 20°, the resonant peak of another ENZ mode is excited due to the effective permittivity crossing zero at the wavelength of 10.8 mm (figure 4(b)).…”

“…In addition to the aforementioned ENZ materials for near infrared applications, several ENZ materials have been discovered for emission applications over mid-infrared [33,34] and far-infrared wavelength [35,36]. Aluminum doped zinc oxide (AZO) has plasmonic response in the near and mid-infrared region [33,37] and tunability by adjusting the density of free electrons [34,38,39]. Rensberg et al [39] demonstrated that the wavelength at which the permittivity of AZO is equal to zero can be arbitrarily controlled from 3.7 to 9.2 mm by varying the freecarrier concentrations.…”

Anapole Manipulation in Tailored Si Nanocubes for Near-Field Enhancement and High Q-Factor Resonance

“…By exciting the anapole, tailored dielectric nanomaterials can provide similar opportunities to their metallic counterparts. Such a novel dielectric photonic state provides potential applications in local near-field enhancement, , nonlinear optical effect, − photocatalysis, − and refractive index sensors. , …”