Highly sensitive biosensor based on two-layer dielectric-loaded plasmonic microring

Liu Heng; Ma Tao; Yu Chongxiu; Gao Jinhui

In order to realize long propagation length, a two-layer dielectric-loaded surface plasmon polaritions(TDL-SPPs) waveguide was proposed． The mode field distributions and propagation properties of the TDL-SPPs waveguide were studied by using finite element method(FEM). The waveguide sensitivity was also studied. The results show that the propagation length of the proposed TDL-SPPs waveguide is 2.4 times as much as that of the conventional dielectric-loaded surface plasmon polaritons(DL-SPPs) waveguide. The TDL-SPPs microring resonator based highly sensitive biosensor was demonstrated. The results show that the sensitivity is more than 411 nm/RIU and the detection limit is less than 1.210-5 RIU. The design and research on the biosensor based on TDL-SPP microring resonator is a valuable exploration in biosensing application with high sensitivity.

1. College of Electronic and Electrical Engineering,Henan Normal University,Xinxiang 453007,China;

2. Henan Key Discipline Open Laboratory of Electromagnetic Wave Detecting,Xinxiang 453007,China;

3. State Key Laboratory of Information Photonics and Optical Communications,Beijing University of Posts and Telecommunications,Beijing 100876,China

Received Date: 2016-07-05

Rev Recd Date: 2016-08-03

Publish Date: 2017-03-25

Key words:

Abstract: In order to realize long propagation length, a two-layer dielectric-loaded surface plasmon polaritions(TDL-SPPs) waveguide was proposed． The mode field distributions and propagation properties of the TDL-SPPs waveguide were studied by using finite element method(FEM). The waveguide sensitivity was also studied. The results show that the propagation length of the proposed TDL-SPPs waveguide is 2.4 times as much as that of the conventional dielectric-loaded surface plasmon polaritons(DL-SPPs) waveguide. The TDL-SPPs microring resonator based highly sensitive biosensor was demonstrated. The results show that the sensitivity is more than 411 nm/RIU and the detection limit is less than 1.210-5 RIU. The design and research on the biosensor based on TDL-SPP microring resonator is a valuable exploration in biosensing application with high sensitivity.

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Highly sensitive biosensor based on two-layer dielectric-loaded plasmonic microring

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