Nanomaterials (Apr 2020)

The Interference Pattern of Plasmonic and Photonic Modes Manipulated by Slit Width

  • Xing Li,
  • Jing Tang,
  • Xuelian Zhang,
  • Ruirui Zhang,
  • Xiangyu Zeng,
  • Zijun Zhan,
  • Chunxiang Liu,
  • Chuanfu Cheng

DOI
https://doi.org/10.3390/nano10040730
Journal volume & issue
Vol. 10, no. 4
p. 730

Abstract

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We demonstrate that the interference pattern of the plasmonic and photonic modes can be controlled by changing the slit width of a square slit structure. Based on the analyses of the plasmonic and photonic modes of slits with different widths, we theoretically derived the expressions of wavefield generated by a square slit. A far-field scattered imaging system is utilized to collect the intensity distribution experimentally. Various interference patterns, including stripes, square-like lattice array, and diamond-like lattice array, have been observed by adjusting the slit widths. In addition, the results were validated by performing finite-difference time-domain simulations, which are consistent with the theoretical and experimental results.

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