Design and fabrication of PbTe/BaF2 hydrophobic high-efficiency broad-band antireflection coating on Ge substrate in long-wave infrared region
| Autor: | A. Behranvand, M. Mahdavi, M. Davoudi Darareh, M. Jannesari |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Barium fluoride chemistry.chemical_element Germanium 02 engineering and technology Substrate (electronics) Surface finish engineering.material 01 natural sciences 010309 optics Contact angle chemistry.chemical_compound Coating 0103 physical sciences Surface roughness business.industry 021001 nanoscience & nanotechnology Condensed Matter Physics Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials chemistry engineering Optoelectronics 0210 nano-technology business Layer (electronics) |
| Zdroj: | Infrared Physics & Technology. 92:163-165 |
| ISSN: | 1350-4495 |
| Popis: | Hydrophobic high efficiency broad-band antireflection (BBAR) coating in long-wave infrared (LWIR) region (7.5–11 µm) was designed and fabricated on germanium substrate by PVD technique. The multi-layer coating materials used in the design were Lead Telluride (PbTe) as high index material and Barium Fluoride (BaF2) as low index material. Hydrophobic high-efficiency BBAR coating with an average water contact angle of 102° was obtained only by the intrinsic surface roughness of BaF2 layer and without any surface treatment. AFM and FTIR spectrophotometer were used to investigate the surface topography and average reflection of the multi-layer coating, respectively. The average roughness obtained about 13 nm. The average reflection of the hydrophobic high-efficiency BBAR coating was 0.72% in the wavelength range from 7.5 to 11 µm that leads to eliminate Narcissus effect. Infrared optical windows and domes, having hydrophobic BBAR coatings, can effectively be applicable to humid or marine environments. |
| Databáze: | OpenAIRE |
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