Abstract
A split-cube-resonator-based metamaterial structure that can act as a polarization- and direction-selective perfect absorber for the infrared region is theoretically and experimentally demonstrated. The structure, fabricated by direct laser writing and electroless silver plating, is comprised of four layers of conductively-coupled split-cube magnetic resonators, appropriately rotated to each other to bestow the desired electromagnetic properties. We show narrowband polarization-selective perfect absorption when the structure is illuminated from one side; the situation is reversed when illuminating from the other side, with the orthogonal linear polarization being absorbed. The absorption peak can be tuned in a wide frequency range by a sparser or denser arrangement of the split cube resonators, allowing to cover the entire atmospheric transparency window. The proposed metamaterial structure can find applications in polarization-selective thermal emission at the IR atmospheric transparency window for radiative cooling, in cost-effective infrared sensing devices, and in narrowband filters and linear polarizers in reflection mode.
Highlights
A split-cube-resonator-based metamaterial structure that can act as a polarization- and directionselective perfect absorber for the infrared region is theoretically and experimentally demonstrated
The magnetic nature of the resonance is verified by the retrieved effective magnetic permeability; for the chosen dimensions, the resonant frequency for the single row/layer of split-cube resonators (SCRs) appears at 22 THz
In the experiment only the forward illumination direction is examined and comparison with the theoretical results calculated for the free-standing structure is performed on the co- and cross-polarized reflection components
Summary
A split-cube-resonator-based metamaterial structure that can act as a polarization- and directionselective perfect absorber for the infrared region is theoretically and experimentally demonstrated. The resulting component designs can be scaled to work in different parts of the electromagnetic spectrum (due to the invariability of Maxwell’s equations), especially from RF and microwave to mid-infrared frequencies where metals behave predominantly as perfect conductors Such artificial structured materials have been proposed for various applications, ranging from polarization resolved spectroscopy and nonlinear effects to light modulators and absorbers[1,2,3,4,5]. The metamaterial is comprised of four layers of conductively-coupled split-cube magnetic resonators appropriately rotated to each other to: (i) support a high-quality-factor magnetic resonance, (ii) create a geometric asymmetry with respect to the structure mid-plane along the propagation direction, essential for bestowing directional sensitivity, and (iii) suppress the generation of cross-polarized reflection and transmission components. Excellent agreement between theoretical predictions and measurements conducted by Fourier-Transform Infrared Spectroscopy is found, verifying the practical application perspective of our approach
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