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Optical Transient Relaxation of an Ag-BaO Composite Thin Film with Supercontinuum Probe |
| WANG Dan-Ling1;YANG Hong1;JIANG Hong-Bing1;GONG Qi-Huang1;ZHANG Qi-Feng2;WU Jin-Lei2 |
| 1Department of Physics and State Key Laboratory for Mesoscopic Physics, Peking University, Beijing 100871
2Department of Electronics, Peking University, Beijing 100871 |
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| Cite this article: |
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WANG Dan-Ling, YANG Hong, JIANG Hong-Bing et al 2002 Chin. Phys. Lett. 19 1115-1118 |
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Abstract The optical transient absorption spectra of an Ag-BaO thin film have been detected at a wavelength ranging from 400 nm to 1000 nm using the pump supercontinuum probe technique with resolution of 130 fs. We have observed the optical ultrafast relaxation, in which the electrons near the Fermi level of Ag nanoparticles were excited to a non-equilibrium state and then returned to an equilibrium state. The decay time was exponentially fitted and varied from 0.67 ps to 4 ps for different components of the supercontinuum probe. The peak of an unoccupied state for silver at level X'4 was estimated to be 1.47 eV above the Fermi level.
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| Keywords:
42.65.Re
68.55.-a
68.60.-p
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Published: 01 August 2002
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| PACS: |
42.65.Re
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(Ultrafast processes; optical pulse generation and pulse compression)
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68.55.-a
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(Thin film structure and morphology)
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68.60.-p
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(Physical properties of thin films, nonelectronic)
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