1. Two-photon pumped spaser based on the CdS/ZnS core/shell quantum dot–mesoporous silica–metal structure.
- Author
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Zhan, Zi-Jun, Ma, Li, Li, Jian-Fei, Zhang, Yu-Qin, Liu, Chun-Xiang, Zhang, Rui-Rui, Zeng, Xiang-Yu, Cheng, Chuan-Fu, and Cheng, Chen
- Subjects
ZINC sulfide ,MESOPOROUS silica ,SILICA films ,FEMTOSECOND pulses ,LIGHT sources ,QUANTUM dots ,LUMINESCENCE - Abstract
The spaser (a plasmonic nanolaser) has rapidly advanced as a subwavelength light source candidate. Herein, we introduce a spaser based on a quantum-dot, mesoporous-oxide, and metal structure from top to bottom consisting of CdS/ZnS core/shell quantum dots, a mesoporous silica film (MSF), and an Au film, respectively. Two-photon pumping using femtosecond laser pulses at 800 nm creates amplified spontaneous emission at approximately 451 nm. The advantages of MSF as a dielectric gap layer are examined through numerical simulations. Measuring the dependence of the luminescence intensity on the average pump power confirms the occurrence of two-photon up-conversion luminescence. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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