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AIST, Waseda University to enhance photonic crystals

Posted: 04 Feb 2003 ?? ?Print Version ?Bookmark and Share

Keywords:national institute of advanced industrial science and technology? aist? waseda university? photonic crystal? optical communications?

The Photonics Research Institute of the National Institute of Advanced Industrial Science and Technology (AIST) and Waseda University have jointly developed a technique to create photonic crystals made of titanium dioxide with higher light transmission in the optical communications waveband than semiconductors such as silicon. According to the researchers, the technology also interfaces well with optical fiber because its refraction factor is close to that of the fiber.

The technology uses x-ray lithography to form submicron-order molds in a polymethylmethacrylate film, applies liquid phase deposition to fill up molds with titanium dioxide, and selectively removes the film to create photonic crystal pillars, 640nm in diameter and 25m in height, which are aligned hexagonally.

AIST explains that one possible photonic crystal application may be ultra-small optical mixing and branching filters, which could significantly reduce filter size compared to similar filters based on arrayed waveguide grating, an NTT technology.

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