Dynamically tunable perfect absorption based on quantum plasmonic metal-insulator-metal mirror

Achieving perfect absorption in nanostructures plays a crucial role in applications such as photovoltaics, photoluminescence, and sensing. In recent years, a large number of scholars have devoted themselves to the research of metamaterial absorbers from microwave to optical frequencies. However, almost these absorbers are based on the resonant absorption resulting from strong electromagnetic coupling. In this study, we propose a dynamically tunable perfect absorber based on quantum plasmonic tunneling effect with nonelectromagnetic coupling in a metal-insulator-metal mirror, which has never been demonstrated before as far as we know. With the manipulation of tunneling current and tunneling damping via altering the external bias on the tunneling electrodes, the absorptivity of proposed absorber can be modulated at the Er:YAG laser wavelength ( 2940 nm) ) with the modulation deep near 92%. Moreover, both the absorptivity and full width at half maximum of this absorber have strong robustness to the incidence angle. This ultra-thin perfect absorber, characterized by its rapid response, exceptional integration capabilities, robust tolerance to the incidence angle, and superior controllability, holds tremendous promise for a broad range of applications within the realm of infrared imaging and treatment.