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We report, for the first time, a full experimental and computationalinvestigation of all possible light matter interactions on the surface of aninfrared metamaterial absorber (MMA). Two channels of energy dissipation -diffuse scattering and generation of surface electromagnetic waves - arequantified in terms of their impact on specular absorption. The diffusescattering is found to play a negligible roll in the absorption process, atleast for wavelengths greater than the periodicity of unit cell. In contrast,surface electromagnetic waves are found to be generated for transverse magnetic(TM) polarized light at the operational wavelength of the MMA, i.e. \lambda_0,and shorter wavelengths. Our computational results indicate that the highlylossy surface electromagnetic wave generated at \lambda_0 is responsible forthe good angular dependence of absorption in TM polarization. Experimentalresults are supported by full wave three dimensional electromagnetic andeigenmode simulations.

Characterization of Surface Electromagnetic Waves and Scattering on Infrared Metamaterial Absorbers