期刊
IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS
卷 30, 期 4, 页码 383-386出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LMWC.2020.2979708
关键词
Critical coupling; Dirac cone metasurfaces; electromagnetic metamaterials; external coupling control; perfect absorbers
We propose an ultrathin perfect absorber for normal incident waves using a Dirac cone metasurface with the thickness of 1/38 free-space wavelength. First, we prepare Dirac cone metasurfaces consisting of periodic metallic chain patterns on a dielectric substrate having the $\Gamma $ -point frequencies of approximately 30 GHz. The perfect absorber is designed by adjusting the external coupling of the Dirac cone metasurfaces with their chain densities. Based on the one-port resonator model, we clarify that the perfect absorber is realized at the critical coupling condition with identical internal and external $Q$ -factors. We experimentally demonstrate a perfect absorption with the reflectance as small as -37 dB by the metasurface with the critical external coupling.
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