Near-field plasmonic coupling for enhanced nonlinear absorption by femtosecond pulses in bowtie nanoantenna arrays

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• 作者：Zhendong Yan (1)
  Xu Chen (1)
  Wei Du (1)
  Zhuo Chen (1)
  Peng Zhan (1)
  Hui-Tian Wang (1) (2)
  Zhenlin Wang (1)
  
• 刊名：Applied Physics A: Materials Science & Processing
• 出版年：2014
• 出版时间：December 2014
• 年：2014
• 卷：117
• 期：4
• 页码：1841-1848
• 全文大小：1,800 KB
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• 作者单位：Zhendong Yan (1)
  Xu Chen (1)
  Wei Du (1)
  Zhuo Chen (1)
  Peng Zhan (1)
  Hui-Tian Wang (1) (2)
  Zhenlin Wang (1)
  
  1. School of Physics and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, 210093, China
  2. School of Physics, Nankai University, Tianjin, 300071, China
  
• ISSN：1432-0630

文摘

Plasmonic bowtie nanoantennas (BNAs) can exhibit a strong enhancement of optical field, leading to large nonlinear effects. We investigated the nonlinear optical absorption of an array of BNA by femtosecond pulses, using the open-aperture Z-scan technique. The BNA array composed of paired gold nanotriangles was fabricated by nanosphere lithography. We experimentally demonstrated that upon decreasing the gap width, nonlinear absorption is enhanced due to both the enhancement of near-field coupling of nanoantennas and the minimum of the spectral detuning between the center wavelength of the laser for excitation and the localized surface plasmon resonances. The role of near-field resonant plasmonic coupling in BNA is analyzed theoretically and confirmed by our simulations.