Dynamic near-field nanofocusing by V-shaped metal groove via a femtosecond laser excitation

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• 作者：Guangqing Du ; Qing Yang ; Feng Chen ; Yu Lu ; Yan Ou ; Jiale Yong ; Xun Hou
• 刊名：Applied Physics A: Materials Science & Processing
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：122
• 期：3
• 全文大小：915 KB
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• 作者单位：Guangqing Du (1)
  Qing Yang (1)
  Feng Chen (1)
  Yu Lu (1)
  Yan Ou (1)
  Jiale Yong (1)
  Xun Hou (1)
  
  1. State Key Laboratory for Manufacturing Systems Engineering and Key Laboratory of Photonics Technology for Information, School of Electronics and Information Engineering, Xi’an Jiaotong University, Xi’an, 710049, China
  
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Condensed Matter
  Optical and Electronic Materials
  Nanotechnology
  Characterization and Evaluation Materials
  Surfaces and Interfaces and Thin Films
  Operating Procedures and Materials Treatment
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-0630

文摘

The ultrafast dynamics of plasmonic near-field nanofocusing by a V-shaped groove milled on Au film via a femtosecond laser excitation is theoretically studied based on finite element method. The spatiotemporal evolution of the focused e-fields around the V-groove geometry is obtained. It is revealed that the strong nanofocusing at the V-shaped groove occurs at the moderate electron temperature of 3000 K in the electron–phonon uncoupled state via a femtosecond laser pulse excitation. The phenomenon is explained as the electron thermal dynamics manipulation of plasmon resonances due to femtosecond laser fluence modifications. This study provides basic understanding of ultrafast dynamics of near-field nanofocusing in V-shaped geometry for wide applications in the fields such as super-resolution imaging, SERS, and photothermal therapy.