Highly Sensitive Biochemical Sensor Based on Two-Layer Dielectric Loaded Plasmonic Microring Resonator

作者：Ma, Tao; Yuan, Jinhui^*; Sun, Lei; Li, Feng; Kang, Zhe; Yan, Binbin; Sang, Xinzhu; Wang, Kuiru; Wu, Qiang; Liu, Heng; Gao, Jinhui; Yu, Chongxiu

来源：Plasmonics, 2017, 12(5): 1417-1424.

DOI：10.1007/s11468-016-0401-4

• Surface plasmon resonant
• Opticalwaveguide
• Dielectric-loaded plasmonic waveguide

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.

• 单位
  北京邮电大学; 河南师范大学; 信息光子学与光通信国家重点实验室