Abstract
In this article, we present a design for a triple-band tunable metamaterial absorber with an Au nano-cuboids array, and undertake numerical research about its optical properties and local electromagnetic field enhancement. The proposed structure is investigated by the finite-difference time domain (FDTD) method, and we find that it has triple-band tunable perfect absorption peaks in the near infrared band (1000–2500 nm). We investigate some of structure parameters that influence the fields of surface plasmons (SP) resonances of the nano array structure. By adjusting the relevant structural parameters, we can accomplish the regulation of the surface plasmons resonance (SPR) peaks. In addition, the triple-band resonant wavelength of the absorber has good operational angle-polarization-tolerance. We believe that the excellent properties of our designed absorber have promising applications in plasma-enhanced photovoltaic, optical absorption switching and infrared modulator optical communication.
Highlights
There has been a great development of surface plasmons, which is an electromagnetic wave propagating along the interface between a medium and metal
Au nanoparticles have strong local electromagnetic field enhancement on the surface, which has been widely used in fields such as catalysis, photonics, sensing and surface enhanced Raman scattering (SERS) [20–25]
Under the action of incident plane waves, it can be seen from Figure 4g that the strong electromagnetic field is excited by the Au cube and SiO2 on both sides, while in Figure 4h, the excitation is mainly caused by the interaction between the Au cube, SiO2 and air
Summary
There has been a great development of surface plasmons, which is an electromagnetic wave propagating along the interface between a medium and metal. Due to the strong resonance of metal structures, the absorption rate is almost perfect.
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