Origin of Nonlinear Optical Characteristics of Crystalline Ge–Sb–Te Thin Films for Possible Superresolution Effects
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概要
- 論文の詳細を見る
An experiment was conducted to investigate the origin of the nonlinear optical characteristics of crystalline Ge2Sb2Te5 and Ge-doped SbTe thin films which have been demonstrated to have the capability of a superresolution readout. By means of the real-time measurement of the electrical resistance combined with concurrent optical reflectance/transmittance measurement during pulsed laser irradiation of varying power, it was found that the absorption coefficients of these films decrease with increasing laser power, accompanied most probably by an increase in the carrier concentration. This finding may be understood in light of the saturable absorption due to band filling by thermally assisted photoexcited carriers. This has been previously proposed as an important cause of the superresolution effect of PbTe, which belongs to the chalcogenide degenerate semiconductors such as the GeSbTe materials under study.
- Japan Society of Applied Physicsの論文
- 2007-04-25
著者
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Kim Won
Thin Film Materials Research Center Korea Institute Of Science And Technology
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Cheong Byung-ki
Thin Film Materials Research Center Korea Institute Of Science And Technology
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Lee Taek
Thin Film Materials Research Center Korea Institute Of Science And Technology
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Lee Hyun
Thin Film Materials Research Center, Korea Institute of Science and Technology, 39-1 Hawolgok-dong, Sungbuk-ku, Seoul 136-791, Korea
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Kim Donghwan
Department of Material Science and Engineering, College of Engineering, Korea University, Seoul 136-713, Korea
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Kim Won
Thin Film Materials Research Center, Korea Institute of Science and Technology, 39-1 Hawolgok-dong, Sungbuk-ku, Seoul 136-791, Korea
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Jeong Jeung-hyun
Thin Film Materials Research Center, Korea Institute of Science and Technology, 39-1 Hawolgok-dong, Sungbuk-ku, Seoul 136-791, Korea
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Lee Suyoun
Thin Film Materials Research Center, Korea Institute of Science and Technology, 39-1 Hawolgok-dong, Sungbuk-ku, Seoul 136-791, Korea
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