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Ultrafast dynamics of BixSb1-x film studied by femtosecond pump-probe technique |
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| Authors: | Tengfei Wu Laixin Jiang Wei Jia |
| Affiliation: | a Information Optics Laboratory, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China b Key Laboratory of High Power Laser Materials, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China c High Density Optical Storage Laboratory, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China d Beijing GK Laser Technology Co, Ltd, Beijing 100085, China |
| Abstract: | The BixSb1-x film is an important phase change material. The ultrafast dynamics of BixSb1-x film is studied by the femtosecond pump-probe technique with an 80 fs pulsed laser. Experimental results show that the reflectivity change increases with the fluence of the pump laser. The fast increase of the reflectivity occurs between 100 and 800 fs. Subsequently, the slower recovery of the reflectivity on a time scale of 1.24-18.3 ps is detected. We also found that the reflectivity change can be greatly affected by the ratio between Bi and Sb composition in BixSb1-x materials with x = 0.2 and 0.88. These experimental results should be helpful for developing new devices with ultrafast dynamics of BixSb1-x film and ultrafast optical switching. |
| Keywords: | Femtosecond pump-probe technique Ultrafast dynamics BixSb1-x film |
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