Effects of substrate phonon absorption on the resonance behavior of metal-insulator-metal metamaterial terahertz absorbers
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Abstract We have investigated effects of substrate phonon absorption on the resonance behavior of metal-insulator-metal double layer metamaterial absorbers in the terahertz frequency range. A sharp resonant absorption dip is clearly observed for a metamaterial-on-ground-plane structure fabricated on a GaAs substrate when THz radiation is incident from the surface metamaterials side. However, when the THz is incident from the substrate side to the ground-plane-on-metamaterial structures fabricated on a GaAs substrate, the resonance dip is almost merged into the broad background of acoustic phonon absorption. The resonant absorption is recovered when the GaAs substrate is replaced with a high-resistivity Si substrate.
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2014 ◽
Vol 4
(2)
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pp. 110-121
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2021 ◽
Vol 4
(3)
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pp. 2470-2475
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