Highly Sensitive Biochemical Sensor Based on Two-Layer Dielectric Loaded Plasmonic Microring Resonator |
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| Authors: | Tao Ma Jinhui Yuan Lei Sun Feng Li Zhe Kang Binbin Yan Xinzhu Sang Kuiru Wang Qiang Wu Heng Liu Jinhui Gao Chongxiu Yu |
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| Institution: | 1.State Key Laboratory of Information Photonics and Optical Communications,Beijing University of Posts and Telecommunications (BUPT),Beijing,China;2.College of Electronic and Electrical Engineering,Henan Normal University,Xinxiang,China;3.Photonics Research Center, Department of Electronic and Information Engineering,The Hong Kong Polytechnic University,Kowloon,Hong Kong, China;4.Photonics Research Center, School of Electronic and Communications Engineering,Dublin Institute of Technology,Dublin,Ireland;5.Department of Physics and Electrical Engineering,Northumbria University,Newcastle Upon Tyne,UK |
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| Abstract: | In this paper, we propose and design a highly sensitive optical biochemical sensor based on two-layer dielectric loaded surface plasmon polariton waveguide (TDLSPPW)-based microring resonator (MRR). By optimizing the structure parameters, the propagation length of the proposed waveguide is ~126 μm, which is about 3 times of that of the polymer dielectric loaded surface plasmon polariton waveguide (DLSPPW) reported. It is demonstrated that the TDLSPPW-based MRR is operated at the under-coupling state, along with the quality factor (Q) of 541.2 and extinction ratio (ER) of 12.2 dB. Moreover, the Q and ER are much more sensitive to the structure parameters of the waveguide, including the waveguide width w, total thickness t, and coupling gap W gap, compared to the low refractive index (RI) layer thickness t 2. The simulation results on the biochemical RI sensing show that the sensitivities of 408.7 and 276.4 nm/RIU for glucose concentration in urine and chemical gases can be achieved, respectively. It is believed that the proposed sensor has potential applications in photonic-integrated biochemical sensing. |
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