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Plasmonic Filter Using Metal-Insulator-Metal Waveguide with Phase Shifts and its Transmission Characteristics

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Abstract

A plasmonic filter based on metal-insulator-metal (MIM) waveguide with phase shifts is proposed, and the corresponding transmission characteristics are investigated. Since the insulator layer in the MIM waveguide is structured by alternately stacking two insulators with different refractive indices, an inverse arrangement of the two insulators leads to the generation of a π phase shift, and multiple π phase shifts can be formed in the insulator layer in this way. Due to the introduction of π phase shifts into MIM waveguides, novel transmission characteristics can be obtained, like these in one-dimensional photonic crystals or fiber gratings. Such transmission responses of the plasmonic filter with phase shifts are then investigated using the finite-difference time-domain (FDTD) method. When a π phase shift is inserted into the insulator layer, a transmission channel in the plasmonic band gap is excited, owing to the resultant resonant defect mode. Next, multiple transmission channels can also be obtained by inserting multiple π phase shifts into the insulator layer, of which the wavelengths are associated with the distribution of these phase shifts. Further, when the spacing of multiple phase shifts is increased, the transmission channels converge together, and then a single narrow transmission channel is formed. On the other hand, as the spacing is reduced, the transmission channels move far from each other and the total loss of multiple channels can be reduced and flattened, leading to the generation of multiple high-uniformity transmission channels in the plasmonic band gap.

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Acknowledgements

The work was supported in part by the Program for New Century Excellent Talents in University of China (NCET-12-0940), the National Natural Science Foundation of China (91233119), the Chun-Hui Project of Ministry of Education of China (Z2011124), and the Science and Technology Project of Chengdu City (12DXYB287JH-005).

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Authors and Affiliations

  1. School of Information Science and Technology, Southwest Jiaotong University, Chengdu, 610031, China

    Xin Luo, Xihua Zou, Wei Pan, Bin Luo & Lianshan Yan

  2. Institute of Modern Optical Technologies, Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province and Key Lab of Modern Optical Technologies of Education Ministry of China, Soochow University, Suzhou, 215006, China

    Xiaofeng Li

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  1. Xin Luo
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  2. Xihua Zou
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  3. Xiaofeng Li
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  4. Wei Pan
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  5. Bin Luo
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  6. Lianshan Yan
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Correspondence to Xihua Zou.

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Luo, X., Zou, X., Li, X. et al. Plasmonic Filter Using Metal-Insulator-Metal Waveguide with Phase Shifts and its Transmission Characteristics. Plasmonics 9, 887–892 (2014). https://doi.org/10.1007/s11468-014-9693-4

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  • DOI: https://doi.org/10.1007/s11468-014-9693-4

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