| Budget Amount *help |
¥20,800,000 (Direct Cost: ¥16,000,000、Indirect Cost: ¥4,800,000)
Fiscal Year 2014: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2013: ¥6,630,000 (Direct Cost: ¥5,100,000、Indirect Cost: ¥1,530,000)
Fiscal Year 2012: ¥10,010,000 (Direct Cost: ¥7,700,000、Indirect Cost: ¥2,310,000)
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| Outline of Final Research Achievements |
We fabricated germanium photonic crystal (PhC) nanobeam cavities and observed enhanced photoluminescence at the cavity resonances at room temperature. We achieve the cavity Qs of 1,350 and 1,850 for a L3-type and a lattice-modulated PhC nanobeam cavities, respectively. We also numerically demonstrated that a strong uniaxial tensile strain in an air-suspended germanium PhC nanobem cavity by combining the effects of a strained SiN film deposited on the top and of the pad structures that support the nanobeam. The induced strain reduces the energy difference between the conduction band minima of germanium at the G and L points inside the cavity region, where strong light-matter interaction is expected to take place.
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