title: Simple fabrication of an antireflective hemispherical surface structure using a self-assembly method for the terahertz frequency range.
abstract: A hemispherical surface structure was fabricated on a sapphire substrate by utilizing a self-assembly and spin-coating process for a terahertz (THz) antireflection coating. The self-assembled glass spheres and spin-coated material led to a gradual change in the effective refractive index. The aspect ratio of the hemispherical surface structure was controlled easily by adjusting the thickness of the B-staged bisbenzocyclobutene used as a coating. The reflectance of the fabricated hemispherical surface structure, having a period of 140 μm, exhibited low reflectance and low Fabry-Perot resonance in a THz spectral range from 0.1 to 1.9 THz.
authors: School of Information and Communications, Gwangju Institute of Science and Technology, 1 Oryongdong, Buk-gu, Gwangju 500-712, South Korea.
authors: Dae-Seon
authors: DS
authors: Kim
authors: Dong-Ju
authors: DJ
authors: Kim
authors: Dong-Hyun
authors: DH
authors: Kim
authors: Sehyun
authors: S
authors: Hwang
authors: Jae-Hyung
authors: JH
authors: Jang
mesh_terms: D005898:Glass / Q000737:chemistry; D055620:Optical Phenomena; D011083:Polycyclic Compounds / Q000737:chemistry; D013499:Surface Properties
chemical_list: D011083:Polycyclic Compounds; C079040:benzocyclobutene