Chinese Journal of Quantum Electronics ›› 2023, Vol. 40 ›› Issue (6): 983-991.doi: 10.3969/j.issn.1007-5461.2023.06.018

• Fiber and Waveguide Optics • Previous Articles    

Design of multichannel filter based on surface plasmon polaritons

ZHANG Xingjiao 1* , ZENG Lili 2 , WEN Ruquan 1 , LIAO Jianbo 1 , LI Xinwei 1   

  1. ( 1 School of Mechanical and Electronic Engineering, Pingxiang University, Pingxiang 337055, China; 2 School of New Energy, Hunan Vocational Institute of Technology, Xiangtan 411104, China )
  • Received:2022-07-18 Revised:2022-08-30 Published:2023-11-28 Online:2023-11-28

Abstract: A metal-dielectric-metal (MDM) filter is designed which is composed of a slot cavity and two waveguides. The influence of main structure parameters on the transmission characteristics of the filter is analyzed in detail using the finite-difference time-domain (FDTD) method. It is found that the lateral displacement Ld has a significant impact on transmission properties of the filter,which will lead to the appearance of new resonance peaks. In addition, it is shown that the increase of the cavity width Wc will not only make the number of transmission peaks increase, but also make the transmission peaks distribute more uniformly in the range from 600 nm to 1500 nm within limits. Through parameter optimization, a multi-channel filter distributed near the 550, 730, 920 and 1330 nm wavelength windows in optical communication systems is designed. The design has the advantages of narrow transmission peak, good quality factor, simple structure, easy integration and easy fabrication, which can be well used in wavelength-division multiplexing system and optical communication.

Key words: optoelectronics, surface plasmon polaritons, metal-dielectric-metal structural waveguide, finite-difference time-domain, transmission characteristics

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