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

 

Lu Ding Qing Yang Steve Wu Jun Feng Song^,Kazunori Serita Masayoshi Tonouchi, Jing Hua Teng
http://onlinelibrary.wiley.com/doi/10.1002/adom.201300321/abstract
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.