Two-photon pumped spaser based on the CdS/ZnS core/shell quantum dot–mesoporous silica–metal structure
Zi-Jun Zhan,
Li Ma,
Jian-Fei Li,
Yu-Qin Zhang,
Chun-Xiang Liu,
Rui-Rui Zhang,
Xiang-Yu Zeng,
Chuan-Fu Cheng,
Chen Cheng
Affiliations
Zi-Jun Zhan
School of Physics and Electronics, Shandong Provincial Key Laboratory of Optics and Photonic Devices, Shandong Normal University, Jinan 250014, People’s Republic of China
Li Ma
School of Physics and Electronics, Shandong Provincial Key Laboratory of Optics and Photonic Devices, Shandong Normal University, Jinan 250014, People’s Republic of China
Jian-Fei Li
School of Electronic and Information Engineering (Department of Physics), Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, People’s Republic of China
Yu-Qin Zhang
School of Physics and Electronics, Shandong Provincial Key Laboratory of Optics and Photonic Devices, Shandong Normal University, Jinan 250014, People’s Republic of China
Chun-Xiang Liu
School of Physics and Electronics, Shandong Provincial Key Laboratory of Optics and Photonic Devices, Shandong Normal University, Jinan 250014, People’s Republic of China
Rui-Rui Zhang
School of Physics and Electronics, Shandong Provincial Key Laboratory of Optics and Photonic Devices, Shandong Normal University, Jinan 250014, People’s Republic of China
Xiang-Yu Zeng
School of Physics and Electronics, Shandong Provincial Key Laboratory of Optics and Photonic Devices, Shandong Normal University, Jinan 250014, People’s Republic of China
Chuan-Fu Cheng
School of Physics and Electronics, Shandong Provincial Key Laboratory of Optics and Photonic Devices, Shandong Normal University, Jinan 250014, People’s Republic of China
Chen Cheng
School of Physics and Electronics, Shandong Provincial Key Laboratory of Optics and Photonic Devices, Shandong Normal University, Jinan 250014, People’s Republic of China
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.
