Impact of a Dielectric Layer on the Resonant Conditions of Nanograting Structures

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• 作者：Chao Niu (1)
  Tiffany Huang (1)
  Xin Zhang (2)
  Haitao Liu (2)
  Weihua Zhang (3)
  Jonathan Hu (1)
  
  1. Department of Electrical and Computer Engineering ; Baylor University ; Waco ; TX ; 76798 ; USA
  2. Key Laboratory of Optical Information Science and Technology ; Ministry of Education ; Institute of Modern Optics ; Nankai University ; Tianjin ; 300071 ; China
  3. College of Engineering and Applied Sciences ; Nanjing University ; Nanjing ; 210093 ; China
  
• 关键词：Nanostructures ; Metallic grating ; Surface plasmons ; Sensors
• 刊名：Plasmonics
• 出版年：2015
• 出版时间：April 2015
• 年：2015
• 卷：10
• 期：2
• 页码：419-427
• 全文大小：2,534 KB
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• 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

We study the resonant wavelength of nanograting structures covered by a dielectric medium. We find that the resonant wavelength oscillates as the thickness of the thin dielectric layer increases due to the cavity formed by the dielectric layer. The amplitude of this oscillation in the resonant wavelength is small when the minimum reflection occurs in the nanograting structure. For a plasmonic sensor covered by a dielectric medium, a small oscillation in the resonant wavelength as the thickness of the dielectric medium changes is preferred. We also study the impact of a rounded corner on the resonant wavelength and find that the rounded corners with a small radius of r effectively reduce the nanogroove depth by about 0.2 r. Results from the finite-difference time-domain (FDTD) method agree very well with the phase-matching condition, using parameters calculated from the rigorous coupled-wave analysis (RCWA) method. These results will lead to a better understanding of the accuracy of plasmonic sensors covered by dielectric media.