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SU-8 based planar metamaterials with fourfold symmetry as selective terahertz absorbers

Grześkiewicz B., Sierakowski A., Marczewski J., Pałka N., Wolarz E.

Opto-Electronics Review

2018

Vol. 26, No. 4

329--337

We report on the absorption properties of polarization-insensitive transmissive and reflective metamaterial absorbers based on two planar aluminium periodic structures and SU-8 epoxy resist. These absorbers were investigated using numerical simulation and experimental methods in the terahertz range (below 2 THz). SU-8 is a very promising organic material for dielectric layers in planar metamaterials, because its application simplifies the process of fabricating these structures and significantly reduces the fabri-cation time. The experimental absorption of the metamaterial absorbers has narrowband characteristics that were consistent with the numerical simulations. Power flow analysis in the transmissive metama-terial unit cell shows that the absorption in the terahertz range occurs primarily in the SU-8 layer of the absorber.