中国物理B ›› 2018, Vol. 27 ›› Issue (5): 57802-057802.doi: 10.1088/1674-1056/27/5/057802

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Theoretical study on the lasing plasmon of a split ring for label-free detection of single molecules and single nanoparticles

Chunjie Zheng(郑春杰), Tianqing Jia(贾天卿), Hua Zhao(赵华), Yingjie Xia(夏英杰), Shian Zhang(张诗按), Zhenrong Sun(孙真荣)   

  1. State Key Laboratory of Precision Spectroscopy, College of Physics and Materials, East China Normal University, Shanghai 200062, China
  • 收稿日期:2017-11-27 修回日期:2018-03-01 出版日期:2018-05-05 发布日期:2018-05-05
  • 通讯作者: Tianqing Jia E-mail:tqjia@phy.ecnu.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos.11474097,11374099,and 11274116) and the Open Fund of the State Key Laboratory of High Field Laser Physics (Shanghai Institute of Optics and Fine Mechanics),China.

Theoretical study on the lasing plasmon of a split ring for label-free detection of single molecules and single nanoparticles

Chunjie Zheng(郑春杰), Tianqing Jia(贾天卿), Hua Zhao(赵华), Yingjie Xia(夏英杰), Shian Zhang(张诗按), Zhenrong Sun(孙真荣)   

  1. State Key Laboratory of Precision Spectroscopy, College of Physics and Materials, East China Normal University, Shanghai 200062, China
  • Received:2017-11-27 Revised:2018-03-01 Online:2018-05-05 Published:2018-05-05
  • Contact: Tianqing Jia E-mail:tqjia@phy.ecnu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos.11474097,11374099,and 11274116) and the Open Fund of the State Key Laboratory of High Field Laser Physics (Shanghai Institute of Optics and Fine Mechanics),China.

摘要: This paper reports the plasmonic lasing of a split ring filled with gain material in water. The lasing mode (1500 nm) is far from the pump mode (980 nm), which can depress the detection noise from the pump light. The laser intensities of the two modes simultaneously increase by more than 103 in amplitude, which can intensify the absorption efficiency of the pumping light and enhance the plasmonic lasing. The plasmonic lasing is a sensitive sensor. When a single protein nanoparticle (n=1.5, r=1.25 nm) is trapped in the gap of the split ring, the lasing spectrum moves by 0.031 nm, which is much larger than the detection limit of 10-5 nm. Moreover, the lasing intensity is also very sensitive to the trapped nanoparticle. It reduces to less than 1/600 when a protein nanoparticle (n=1.5, r=1.25 nm) is trapped in the gap.

关键词: label-free detection, split-ring resonators, plasmonic lasing, single molecules and single nanoparticles

Abstract: This paper reports the plasmonic lasing of a split ring filled with gain material in water. The lasing mode (1500 nm) is far from the pump mode (980 nm), which can depress the detection noise from the pump light. The laser intensities of the two modes simultaneously increase by more than 103 in amplitude, which can intensify the absorption efficiency of the pumping light and enhance the plasmonic lasing. The plasmonic lasing is a sensitive sensor. When a single protein nanoparticle (n=1.5, r=1.25 nm) is trapped in the gap of the split ring, the lasing spectrum moves by 0.031 nm, which is much larger than the detection limit of 10-5 nm. Moreover, the lasing intensity is also very sensitive to the trapped nanoparticle. It reduces to less than 1/600 when a protein nanoparticle (n=1.5, r=1.25 nm) is trapped in the gap.

Key words: label-free detection, split-ring resonators, plasmonic lasing, single molecules and single nanoparticles

中图分类号:  (Stimulated emission)

  • 78.45.+h
87.85.fk (Biosensors) 52.25.Os (Emission, absorption, and scattering of electromagnetic radiation ?)