Improving Plasmon Sensing Performance by Exploiting the Spatially Confined Field

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• 作者：Zhengqi Liu ; Guiqiang Liu ; Xiaoshan Liu ; Shan Huang ; Pingping Pan ; Yan Wang…
• 关键词：Surface plasmons ; Confined field ; Perfect absorber ; Sensor
• 刊名：Plasmonics
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：11
• 期：1
• 页码：29-36
• 全文大小：3,003 KB
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• 作者单位：Zhengqi Liu (1)
  Guiqiang Liu (1)
  Xiaoshan Liu (1)
  Shan Huang (1)
  Pingping Pan (1)
  Yan Wang (1)
  Chengwu Zou (1)
  Gang Gu (1)
  
  1. Provincial Key Laboratory of Nanomaterials and Sensors, Institute of Optoelectronic Materials and Technology, College of Physics and Communication Electronics, Key Laboratory of Optoelectronic and Telecommunication of Jiangxi, Jiangxi Normal University, Nanchang, 330022, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Biotechnology
  Nanotechnology
  Biophysics and Biomedical Physics
  Biochemistry
  
• 出版者：Springer US
• ISSN：1557-1963

文摘

A universal method for improving sensing performance has been computationally studied based on a common triple-layer metal-dielectric-metal (MDM) plasmonic perfect absorber (PA). Calculation results show that the originally idled resonant optical field in the middle dielectric spacer can be exploited to enhance the sensing capability via etching the dielectric spacer to open a channel for analyte. By comparing with the sensitivity (S) of the common PA-based sensor, an enhancement factor up to 5.0 can be achieved for an etched PA-based sensor. Moreover, in order to maintain the mechanical stability of the structure, a modified PA-based sensor platform with a solid support for the suspended plasmonic disks array was further employed to study the sensing properties. In comparison with the referenced sensor without suspension technique, all the three sensing factors of the S, the figure of merit (FOM), and the spectral intensity difference related figure of merit (FOM*) are noticeably improved with the enhancement factors up to 2.5, 3, and 57, respectively. In addition, since there is no special dealing with the structure except the need of hollowing the dielectric spacer to open the sensing channel for the analysis, the predicted method profiles itself as a simple and universal strategy to improve the sensing performance of a wide variety of nanoplasmonic sensors. Keywords Surface plasmons Confined field Perfect absorber Sensor