Simple fabrication of an antireflective hemispherical surface structure using a self-assembly method for the terahertz frequency range

Simple fabrication of an antireflective hemispherical surface structure using a self-assembly method for the terahertz frequency range

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...

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Veröffentlicht in:Optics letters 2012-07, Vol.37 (13), p.2742-2744
Hauptverfasser: Kim, Dae-Seon, Kim, Dong-Ju, Kim, Dong-Hyun, Hwang, Sehyun, Jang, Jae-Hyung
Format: Artikel
Sprache:eng
Schlagworte:
Antireflection coatings
Glass - chemistry
Optical Phenomena
Polycyclic Compounds - chemistry
Reflectance
Reflectivity
Refractive index
Self assembly
Spectra
Surface Properties
Surface structure
Terahertz frequencies
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Zusammenfassung: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.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.37.002742