| Budget Amount *help |
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2015: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2014: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2013: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
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| Outline of Final Research Achievements |
First, new waveguide structures with a scattering layer and distorted shape were proposed as a light concentrator. The transmission efficiency corresponding to the ratio of the received light to input light power through side-surface of the waveguide was improved, but large loss occurs due to excess scatterings along waveguide. To suppress the scattering, fiber-optic concentrator was proposed. The efficiency of more than 1%-10% was successfully obtained along a ~5 meter-long fiber. Also, omnidirectional photodetectors based on this idea were designed. In addition to above mentioned simple concentrators, optical probes were proposed as one of applications. The light probe of 5-10 cm length, in which both light source and photodetector embedded, enabled to detect the objects around the fiber through the side-face interface. Finally, nanosized applications of optical waveguides were also studied. Waveguide structures and materials were designed to optimize the transmission efficiency.
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