Current Optics and Photonics

Optical Society of Korea (한국광학회)
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Strongly Enhanced Electric Field Outside a Pit from Combined Nanostructure of Inverted Pyramidal Pits and Nanoparticles

  • Meng Wang (Henan Province Engineering Research Center of Microcavity and Photoelectric Intelligent Sensing, School of Electronics and Electrical Engineering, Shangqiu Normal University) ;
  • Wudeng Wang (School of Mathematical and Physical Sciences, Dalian Polytechnic University)
  • Received : 2023.05.15
  • Accepted : 2023.07.17
  • Published : 2023.10.25
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Abstract

We designed a combined nanostructure of inverted pyramidal pits and nanoparticles, which can obtain much stronger field enhancement than traditional periodic pits or nanoparticles. The field enhancement |E|/|E0| is greater than 10 in a large area at 750-820 nm in incident wavelength. |Emax|/|E0| is greater than 60. Moreover, the hot spot is obtained outside the pits instead of localized inside them, which is beneficial for experiments such as surface-enhanced Raman scattering. The relations between resonant wavelength and structural parameters are investigated. The resonant wavelength shows a linear dependence on the structure's period, which provides a direct way to tune the resonant wavelength. The excitation of a propagating surface plasmon on the periodic structure's surface, a localized surface plasmon of nanoparticles, and a standing-wave effect contribute to the enhancement.

Keywords

Acknowledgement

Higher Education Key Program of Henan Province of China (No. 19A140014); National Natural Science Foundation of China (No. 11847162).

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