| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Saturable Absorption Enchantment of Au Nanorods Based on Energy Transfer between Longitudinal and Transverse Energy Levels |
| Si Xiao**, Hui Wang, Sheng Liu, Min Li, Ying-Wei Wang, Jia-Zhang Chen, Lu-Hua Guo, Jian-Bo Li, Jun He** |
1Hunan Key Laboratory of Super-microstructure and Ultrafast Process, School of Physics and Electronics, Central South University, Changsha 410083
2School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116
3Institute of Mathematics and Physics, Central South University of Forestry and Technology, Changsha 410004
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| Cite this article: |
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Si Xiao, Hui Wang, Sheng Liu et al 2018 Chin. Phys. Lett. 35 067801 |
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Abstract Four kinds of Au nanorods (NRs) with different aspect ratios are designed to adjust the relationship between resonance energy level of longitudinal (L) and transverse (T) modes. During the femto-second $Z$-scan experiments, huge saturable absorption phenomena are observed while the energy level T is located between one to two times of the energy level L. This means that the energy may transfer between longitudinal and transverse energy levels in the same and/or different Au NRs. It effectively depresses the production of revised saturated absorption and increases the saturable absorption efficiency. This method is significant for the preparation of high-efficiency saturable absorption devices.
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Received: 31 January 2018
Published: 19 May 2018
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| PACS: |
78.67.-n
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(Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures)
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78.67.Qa
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(Nanorods)
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78.67.Bf
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(Nanocrystals, nanoparticles, and nanoclusters)
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| Fund: Supported by the National Natural Science Foundation of China under Grant Nos 11404410 and 11504105, and the Hunan Provincial Natural Science Foundation under Grant No 2016JJ3140. |
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