Enhanced Bragg Reflection in Non-Bravais Superlattice Formed by a Dislocated Teeth-Shaped Plasmonic Waveguide

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• 作者：Wanguo Liu ; Yang Shen ; Chongjun Jin
• 关键词：Plasmonic waveguide ; Enhanced Bragg reflection ; Non ; Bravais lattice ; Dislocation
• 刊名：Plasmonics
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：10
• 期：6
• 页码：1417-1426
• 全文大小：2,644 KB
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• 作者单位：Wanguo Liu (1)
  Yang Shen (1)
  Chongjun Jin (1)
  
  1. State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering, Sun Yat-sen University, Guangzhou, 510275, China
  
• 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

A periodically teeth-shaped surface plasmonic waveguide with dislocation is theoretically investigated. We propose an equivalent solvable model, a four-section non-Bravais lattice with infinite length to describe the dislocated structure. Based on the Bloch theorem, the band gap and Bragg condition of non-Bravais lattice are both derived, and the effect of dislocation on Bragg reflection is discussed. The analysis indicates that the dislocation has a remarkable effect on the distribution of band gaps and gap width and can cause an enhancement of odd-order or even-order Bragg reflection at different filling factors. In addition, the Bragg wavelength can be linearly adjusted by the dislocation. The transmission spectra of a finite-period plasmonic waveguide are studied via both transfer matrix method and numerical simulation at last. The calculation results present two cases for the enhancement of the first-order and the second-order Bragg reflections with different geometric parameters, respectively. The simulation results verify the enhanced Bragg reflection with the increase of dislocation and are well matched with our theoretical analysis. Keywords Plasmonic waveguide Enhanced Bragg reflection Non-Bravais lattice Dislocation