Ultracompact Slow Surface Plasmon Polaritons Superlattice with Broad Bandwidth and Super-High Normalized Delay-Bandwidth Product

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• 作者：Weihua Lin ; Xiaosong Liu ; Zhiwen Kang ; Qian Wang ; Anhua Dong
• 关键词：Surface plasmon polaritons ; Slow light ; Optical superlattice ; Metal gap waveguide
• 刊名：Plasmonics
• 出版年：2014
• 出版时间：October 2014
• 年：2014
• 卷：9
• 期：5
• 页码：1001-1005
• 全文大小：454 KB
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• 作者单位：Weihua Lin (1)
  Xiaosong Liu (1)
  Zhiwen Kang (2)
  Qian Wang (1)
  Anhua Dong (1)
  
  1. Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education and School of Physics and Technology, Wuhan University, Wuhan, 430072, China
  2. Department of Electronic Engineering, The Chinese University of Hong Kong, Shatin, NT, Hong Kong SAR, China
  
• ISSN：1557-1963

文摘

In this paper, we propose an ultracompact low-loss plasmonic superlattice for slow surface plasmon polaritons. The superlattice consists of a two-dimensional metal gap waveguide (Ag-SiO2-Ag) inserted with thin metal films working as coupled reflectors. Theoretical calculations indicate that the device is working on a broad bandwidth of 37?THz including the two telecom wavelengths of 1,310 and 1,550?nm and with mean group refractive index of 3.5 and mean transmission of 60?%. As the total geometric thickness is only 1.6?μm, the normalized delay-bandwidth product of the superlattice is as high as 0.44. All the theoretical prediction based upon the transfer matrix method is validated by the finite-difference time-domain numerical simulation on surface plasmon polaritons propagating in the superlattice.