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Perfect Broadband Terahertz Antireflection by Deep-Subwavelength, Thin, Lamellar Metallic Gratings

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Abstract

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Perfect broadband terahertz antireflection coatings are demonstrated by deep-subwavelength, thin, lamellar metallic gratings both in theory and experiment. Abrupt phase changes introduced by grating to terahertz wave traversing the coated surface can be tuned from 0 to π as a function of grating parameters. At π/2, the impedance difference between two dielectrics is matched and perfect antireflection occurs.

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