Surface plasmon resonance

Physics

Infrared

Nanotechnology

Plasmon

Optics

Absorption (acoustics)

Metamaterial

Tunable metamaterials

Surface plasmon

Physical chemistry

Nanoparticle

Composite material

Finite-difference time-domain method

Chemistry

Materials science

Polarization (electrochemistry)

Metamaterial absorber

Optoelectronics

Wavelength

Nanomaterials

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.

A Tunable Triple-Band Near-Infrared Metamaterial Absorber Based on Au Nano-Cuboids Array