Experimental demonstration of tunable graphene hyperbolic metamaterial

Abstract

Tuning the macroscopic dielectric response on demand holds potential for actively tunable metaphotonics and optical devices. In recent years, graphene has been extensively investigated as a tunable element in nanophotonics. Significant theoretical work has been devoted on the tuning the hyperbolic properties of graphene/dielectric heterostructures, however, until now, such a motif has not been demonstrated experimentally. Here we focus on a graphene/polaritonic dielectric metamaterial, with strong optical resonances arising from the polar response of the dielectric, which are, in general, difficult to actively control. By controlling the doping level of graphene via external bias we experimentally demonstrate a wide range of tunability from a Fermi level of EF = 0 eV to EF = 0.5 eV, which yields an effective epsilon-near-zero crossing and tunable dielectric properties, verified through spectroscopic ellipsometry and transmission measurements.

References in corpus (8)

• Dielectric function, screening, and plasmons in 2D graphene
• Realization of a High Mobility Dual-gated Graphene Field Effect Transistor with Al2O3 Dielectric
• Novel hyperbolic metamaterials based on multilayer graphene structures
• The Role of Electron-electron Interactions in Graphene ARPES Spectra
• Strong coupling in the far-infrared between graphene plasmons and the surface optical phonons of silicon dioxide
• Retrieval of material parameters for uniaxial metamaterials
• Hyperbolic-metamaterial waveguides for long-range propagation
• Ground-state cooling enabled by critical coupling and dark entangled states

Cited by in corpus (5)

• Dynamic modulation of thermal emission -- a Tutorial
• Ultrafast Topological Engineering in Metamaterials
• Multiple Tunable Hyperbolic Resonances in Broadband Infrared Carbon-Nanotube Metamaterials
• Electrically Driven Hyperbolic Nanophotonic Resonators as High Speed, Spectrally Selective Thermal Radiators
• Giant and Broadband THz and IR Emission in Drift-biased Graphene-Based Hyperbolic Nanostructures