Photonic Sensors, Volume. 10, Issue 4, 375(2020)
Plasmonic Refractive Index Sensors Based on One- and Two-Dimensional Gold Grating on a Gold Film
In this paper, we propose two kinds of composite structures based on the one- and two-dimensional (1D&2D) gold grating on a gold film for plasmonic refractive index sensing. The resonance modes and sensing characteristics of the composite structures are numerically simulated by the finite-difference time-domain method. The composite structure of the 1D gold semi-cylinder grating and gold film is analyzed first, and the optimized parameters of the grating period are obtained. The sensitivity and figure of merit (FOM) can reach 660 RIU/nm and 169 RIU–1, respectively. Then, we replace the 1D grating with the 2D gold semi-sphere particles array and find that the 2D grating composite structure can excite strong surface plasmon resonance intensity in a wider period range. The sensitivity and FOM of the improved composite structure can reach 985 RIU/nm and 298 RIU–1, respectively. At last, the comparison results of the sensing performance of the two structures are discussed. The proposed structures can be used for bio-chemical refractive index sensing.
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Jiankai ZHU, Xiangxian WANG, Yuan WU, Yingwen SU, Tianxu JIA, Hua YANG, Liping ZHANG, Yunping QI, Xiaolei WEN. Plasmonic Refractive Index Sensors Based on One- and Two-Dimensional Gold Grating on a Gold Film[J]. Photonic Sensors, 2020, 10(4): 375
Category: Regular
Received: Feb. 12, 2020
Accepted: Jun. 28, 2020
Published Online: Nov. 25, 2020
The Author Email: WANG Xiangxian (wangxx869@lut.edu.cn)