Polarization-insensitive Electro-tunable Broadband Plasmonic Metamaterial Absorber for Amplitude Modulation

We report an epsilon-near-zero (ENZ) material based polarization-insensitive electro-tunable metamaterial absorber, which comprises a patterned-metal–insulator–metal based nanostructure. The numerical simulations show that coupling of electrically-induced ENZ-mode to the gap-plasmon resonance-mode enables more than 80% average absorbance over 1500–1800 nm wavelength regime and ~10-dB modulation-depth at 1550 nm.