Experimental demonstration of near-infrared epsilon-near-zero multilayer metamaterial slabs

Abstract

Near-infrared epsilon-near-zero (ENZ) metamaterial slabs based on silver-germanium (Ag-Ge) multilayers are experimentally demonstrated. Transmission, reflection and absorption spectra are characterized and used to determine the complex refractive indices and the effective permittivities of the ENZ metamaterial slabs, which match the results obtained from both the numerical simulations and the optical nonlocalities analysis. A rapid post-annealing process is used to reduce the collision frequency of silver and therefore decrease the optical absorption loss of multilayer metamaterial slabs. Furthermore, multilayer grating structures are studied to enhance the optical transmission and also tune the location of ENZ wavelength. The demonstrated near-infrared ENZ multilayer metamaterial slabs are important for realizing many exotic applications, such as phase front shaping and engineering of photonic density of states.

10 pages, 6 figures

References in corpus (6)

• Achieving transparency with plasmonic coatings
• Epsilon-Near-Zero (ENZ) Metamaterials and Electromagnetic Sources: Tailoring the Radiation Phase Pattern
• Topological Transitions in Metamaterials
• Theory of Supercoupling, Squeezing Wave Energy, and Field Confinement in Narrow Channels and Tight Bends Using Epsilon-Near-Zero Metamaterials
• Non-local effects in effective medium response of nano-layered meta-materials
• Experimental realization of epsilon-near-zero metamaterial slabs with metal-dielectric multilayers

Cited by in corpus (4)

• Enhanced Nonlinear Optical Responses of Layered Epsilon-Near-Zero Metamaterials at Visible Frequencies
• Topological phase transition in wire medium enables high Purcell factor at infrared frequencies
• Topological transition in a nanowire medium and its radiative implication
• Double resonant wideband Purcell effect in a polaritonic wire medium