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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Acknowledgments
This work is supported in part by the National Natural Science Foundation of China (61307109 and 61475023), the Beijing Youth Top-notch Talent Support Program (2015000026833ZK08), the Natural Science Foundation of Beijing (4152037), the Fund of State Key Laboratory of Information Photonics and Optical Communications (BUPT) P. R. China (IPOC2016ZT05), the Hong Kong Scholars Program 2013 (PolyU G-YZ45), the Key scientific and technological project of Henan province (132102210043), and Youth Scientific Funds of Henan Normal University (2011QK08 and 2012QK08).
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Ma, T., Yuan, J., Sun, L. et al. Highly Sensitive Biochemical Sensor Based on Two-Layer Dielectric Loaded Plasmonic Microring Resonator. Plasmonics 12, 1417–1424 (2017). https://doi.org/10.1007/s11468-016-0401-4
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DOI: https://doi.org/10.1007/s11468-016-0401-4