期刊
IEEE ACCESS
卷 9, 期 -, 页码 2924-2933出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/ACCESS.2020.3047509
关键词
Sensitivity; Gold; Metals; Silicon compounds; Refractive index; Optical surface waves; Lattices; Broad sensing range; low analyte refractive index; plasmonic oscillations; wavelength sensitivity
资金
- National Research Foundation of Korea - Korean Government (Ministry of Science) [ICT-NRF-2020R1A2B5B02002478]
The proposed SPR-based PCF sensor demonstrates good functionality with high wavelength and amplitude sensitivity, as well as a broad range of analyte detection and high detection accuracy. Numerical investigations show that the sensor is capable of effectively detecting low refractive index analytes.
A surface plasmon resonance (SPR) based photonic crystal fiber (PCF) sensor having a milled microchannel, and an open D-channel has been proposed in this paper. The sensor shows good functionality in the wide sensing range of 1.14-1.36 Refractive Index Units (RIU) of the analyte, having the capability to detect low refractive index (RI). The Finite Element Method (FEM) based numerical investigations dictate that the proposed sensor has been able to gain a maximum wavelength sensitivity of 53,800 nm/RIU according to the wavelength interrogation technique. The amplitude interrogations show that the sensor has the highest amplitude sensitivity of 328 RIU-1. The highest FOM (Figure of Merit) has been found to be 105 RIU-1. The sensor evinces a minimum wavelength resolution of 1.86 x 10(-6) RIU, which secures high detection accuracy. A circular perfectly matched layer (PML) is implemented in the sensor's outermost layer as a boundary condition to absorb surface radiations. Gold is the plasmonic metal, while TiO2 acts as the adhesive layer for gold attachment on silica. Due to the high sensitivity with a broad range of analyte detection, the sensor is well suited for practical biochemical detection purposes.
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