| Budget Amount *help |
¥46,800,000 (Direct Cost: ¥36,000,000、Indirect Cost: ¥10,800,000)
Fiscal Year 2015: ¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2014: ¥11,310,000 (Direct Cost: ¥8,700,000、Indirect Cost: ¥2,610,000)
Fiscal Year 2013: ¥13,390,000 (Direct Cost: ¥10,300,000、Indirect Cost: ¥3,090,000)
Fiscal Year 2012: ¥15,730,000 (Direct Cost: ¥12,100,000、Indirect Cost: ¥3,630,000)
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| Outline of Final Research Achievements |
This study has successfully demonstrated a thermal-free ultrafast optical response for thin films in a crossover thickness regime between nano- and bulk regimes, where the excitonic mode with a wide radiative width exhibits a radiative decay faster than the dephasing at room temperature. We have observed an ultrafast response with 10 fs order by the excitation covering a whole width of the ultra-wide mode, where the signal reduction at room temperature is minimized. Our newly developed theory of nonlinear response of the ultra-wide modes well explains the above results. Furthermore, we have developed a theory for the ultrafast photoluminescence of confined excitons in the crossover thickness regime, and it proposes up-conversion photoluminescence from the superposed states of energetically different excitonic states coupled each other via radiation. We have also observed similar effects in experiments, which show the possibility for developing a new type of up-conversion light source.
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