We propose a sub-wavelength structure on vanadium oxide film as an extra
absorption layer (i.e. absorber) based on surface plasmon resonance effects, enhancing
dual-band absorption in both middle wavelength infrared (MWIR) and long wavelength
infrared (LWIR) region. Simulation results show that the absorber with disk structure has two
absorption peaks at wavelengths λ=4.8μm and λ=9μm with the absorption magnitudes more
than 0.98 and 0.94 in MWIR and LWIR region, respectively. Similarly, simulation results
show that the absorber with square structure has two absorption peaks at wavelengths
λ=4.8μm and λ=9.2μm with the absorption magnitudes more than 0.99 and 0.99 in MWIR
and LWIR region, respectively.
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