2012 Fiscal Year Final Research Report
Nonlinear optical responses and relaxation processes of photo-carriers in open-shell π-electronic systems
| Project/Area Number |
22340079
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Condensed matter physics I
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| Research Institution | Nagoya University |
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Principal Investigator |
KISHIDA Hideo 名古屋大学, 工学研究科, 教授 (40311633)
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| Co-Investigator(Renkei-kenkyūsha) |
UNUMA Takeya 名古屋大学, 工学研究科, 助教 (20456693)
KOYAMA Takeshi 名古屋大学, 工学研究科, 講師 (20509070)
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| Project Period (FY) |
2010 – 2012
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| Keywords | 光物性 |
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| Research Abstract |
We have investigated the nonlinear optical properties of two open-shell π-electronic systems: doped π-conjugated polymers and biradical molecular compounds. The chemical doping to the conjugated polymers give s rise to the formation of polarons. We performed pump-probe spectroscopy for the doped states of conjugated polymers and revealed that the doping drastically shortens the relaxation time. The pump-probe spectra clarified the interaction of the chemically induced polaron states and the photo-induced species. In the biradical molecular compounds, we revealed the enhanced third-order optical nonlinearity using the third-harmonic generation spectroscopy . Moreover, the experimental results by electromodulation spectroscopysuggest the enhancement mechanism of optical nonlinearity resulting from the degeneracy of the excited states.
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