| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2013: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2012: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2011: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Research Abstract |
We have investigated elastic waves in three-dimensional(3D) phononic crystals which achieve no-phonon environment and edge modes in a wedge-type waveguide whose thickness is varying as a power function of the distance from the top of the wedge. The 3D phononic crystals are composed of arrays of silica spheres with face-centered cubic and hexagonal close-packed structure which are called 'synthetic opals' and we used an FDTD method to calculate the dispersion relations of elastic waves. As a result, we found band gaps in both the structures. However, the gaps disappear with the increase in sintering parameter which represents the overlap of the adjacent spheres. In wedge-type waveguides, we found that, the increase in the power makes the elastic waves localize to the edge part of the wedge strongly and the dwell time of the edge modes increases. Our results will give valuable information for the realization of high-performance waveguide mode.
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