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
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.
. [J]. 中国物理快报, 2018, 35(6): 67801-.
Si Xiao, Hui Wang, Sheng Liu, Min Li, Ying-Wei Wang, Jia-Zhang Chen, Lu-Hua Guo, Jian-Bo Li, Jun He. Saturable Absorption Enchantment of Au Nanorods Based on Energy Transfer between Longitudinal and Transverse Energy Levels. Chin. Phys. Lett., 2018, 35(6): 67801-.
2018, Vol. 35 
