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Title: Highly sensitive biochemical sensor based on two-layer dielectric loaded plasmonic microring resonator
Authors: Ma, T
Yuan, JH 
Sun, L
Li, F 
Kang, Z 
Yan, BB
Sang, XZ
Wang, KR
Wu, Q
Liu, H
Gao, JH
Yu, CX
Keywords: Surface plasmon resonant
Dielectric-loaded plasmonic waveguide
Issue Date: 2017
Publisher: Springer
Source: Plasmonics, 2017, v. 12, no. 5, p. 1417-1424 How to cite?
Journal: Plasmonics 
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 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.
ISSN: 1557-1955
EISSN: 1557-1963
DOI: 10.1007/s11468-016-0401-4
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