Abstract

Electromagnetic field absorbers with ultranarrow relative bandwidth (<1%) and extremely high peak absorbance (>90%) are a challenge in terahertz frequency. In this paper, we propose an insulator-metal-insulator-metal stacked structure with nearly unity peak absorbance (99%) and 0.77% relative bandwidth as an ultranarrowband perfect terahertz absorber. Even though the composite structure contains high reflective metal layers, however, thanks to the introduction of a top insulator, the terahertz field can tunnel through the upper gold film at some functional tunneling bands. As a result, the energy at the Fabry–Perot resonance of the metal-insulator-metal substructure is strongly absorbed due to an enhancement effect. The perfect absorption (>99%) and ultranarrowband width properties make the design promising in terahertz devices such as absorbers, filters, narrowband terahertz emitters, etc.

© 2016 Optical Society of America

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