Abstract
We present a polarization-manipulated multispectral perfect absorber based on a 2D metal/insulator/metal nanocavity array, in which a periodic structure of stacked Au–Al2O3 elliptical nanodisk is deposited on a bulk flat Au substrate. Theoretical analysis of the electromagnetic property showed that both the dipolar plasmon resonance and the plasmon cavity mode are the physical origins of the near-perfect absorption. Owing to the azimuthally symmetry breaking, the reflectivity difference can reach up to 90% through an orthogonal rotation of the incident light polarization. In addition, the central wavelength of these absorption bands is highly sensitive to variation of the surrounding liquid sample’s refractive index. This proposed sub-wavelength plasmonic platform with both features of the polarized manipulation and the sensitive sensing may provide promising applications in multi-wavelength filtering and bio-sensing.
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