Dr. Tetsuo Sato Profile

Dr. Tetsuo Sato

at Nissan Chemical Corp

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Publications (3)

Proceedings Article | 18 January 2011 Paper

Novel organic-inorganic hybrid materials for optical interconnects

Tetsuo Sato

Proceedings Volume 7944, 79440M (2011) https://doi.org/10.1117/12.873672

KEYWORDS: Waveguides, Ultraviolet radiation, Optical interconnects, Absorption, Signal attenuation, Optical printed circuit boards, Organic hybrid materials, Optical communications, Refractive index, Glasses

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Proceedings Article | 27 March 2009 Paper

An approach for automatic selecting of optimal data acquisition window for magnetic resonance coronary angiography

Tetsuo Sato, Tomohisa Okada, Shigehide Kuhara, Kaori Togashi, Kotaro Minato

Proceedings Volume 7259, 72592A (2009) https://doi.org/10.1117/12.810223

KEYWORDS: Heart, Arteries, Data acquisition, Angiography, Magnetism, Magnetic resonance imaging, Visualization, Image processing, Statistical analysis, Time metrology

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Proceedings Article | 12 February 2009 Paper

Nano-scale optical circuits and self-organized lightwave network (SOLNET) fabricated using sol-gel materials with photo-induced refractive index increase

Shigeru Ono, Tetsuzo Yoshimura, Tetsuo Sato, Juro Oshima

Proceedings Volume 7221, 722109 (2009) https://doi.org/10.1117/12.807603

KEYWORDS: Sol-gels, Waveguides, Refractive index, Optical circuits, Ultraviolet radiation, Thin films, Polarization, Silicon, Wave propagation, Beam propagation method

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Recently, Nissan Chemical Industries, LTD, developed the photo-induced refractive index variation sol-gel materials, in which the refractive index increases from 1.65 to 1.85 by ultra-violet (UV) light exposure and baking. The materials enable us to fabricate high-index-contract waveguides without developing/etching processes and strong-lightconfinement self-organized lightwave network (SOLNET). Therefore, the materials are expected promising for nanoscale optical circuits with self-alignment capability. Nano-scale optical circuits with core thickness of ~230 nm and core width of ~1 μm were fabricated. Propagation loss was 1.86 dB/cm for TE mode and 1.89 dB/cm for TM mode at 633 nm in wavelength, indicating that there were small polarization dependences. Spot sizes of guided beams along core width direction and along core thickness direction were respectively 0.6 μm and 0.3 μm for both TE and TM mode. Bending loss of S-bending waveguides was reduced from 0.44 dB to 0.24 dB for TE mode with increasing the bending curvature radius from 5 μm to 60 μm. Difference in bending loss between TM and TE mode was less than 10%. Branching loss of Y-branching waveguides was reduced from 1.33 dB to 0.08 dB for TE mode, and from 1.34 dB to 0.12 dB for TM mode with decreasing the branching angle from 80° to 20°. These results indicate that the photoinduced refractive index variation sol-gel materials can realize miniaturized optical circuits with sizes of several tens μm and guided beam confinement within a cross-section area less than 1.0 μm² with small polarization dependences, suggesting potential applications to intra-chip optical interconnects. In addtion, we fabricated self-organized lightwave network (SOLNET) using the photo-induced refractive index variation sol-gel materials. When write beams of 405 nm in wavelength were introduced into the sol-gel thin film under baking at 200°C, self-focusing was induced, and SOLNET was formed. SOLNET fabricated by low write beam intensity exhibited strong light confinement. Furthermore, SOLNET was found to be drawn automatically to reflective portion such as a defect and a silver paste droplet in the sol-gel thin film during SOLNET formation, indicating that reflective SOLNET is formed. The results suggest that the photo-induced refractive index variation sol-gel materials can provide self-alignment capability to the nano-scale optical circuits.

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