Journal
PLASMONICS
Volume 12, Issue 5, Pages 1417-1424Publisher
SPRINGER
DOI: 10.1007/s11468-016-0401-4
Keywords
Surface plasmon resonant; Opticalwaveguide; Dielectric-loaded plasmonic waveguide
Funding
- National Natural Science Foundation of China [61307109, 61475023]
- Beijing Youth Top - notch Talent Support Program [2015000026833ZK08]
- Natural Science Foundation of Beijing [4152037]
- Fund of State Key Laboratory of Information Photonics and Optical Communications (BUPT) P.R. China [IPOC2016ZT05]
- Hong Kong Scholars Program [PolyU G-YZ45]
- Key scientific and technological project of Henan province [132102210043]
- Youth Scientific Funds of Henan Normal University [2011QK08, 2012QK08]
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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 similar to 126 mu m, 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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