Design of a highly sensitive surface plasmon resonance sensor using aluminum-based diffraction grating |
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| Authors: | Wei Su Gaige Zheng Xiangyin Li |
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| Institution: | 1. Department of Physics, Nanjing University of Science and Technology, Nanjing, China;2. School of Physics and Optoelectronic Engineering, Nanjing University of Information Science and Technology, Nanjing, China;1. Institute of Photonics, University of Eastern Finland (Joensuu Campus), PO Box 111, FI-80101 Joensuu, Finland;2. School of Optoelectronics, Beijing Institute of Technology University, Beijing 100081, China;3. Paul Scherrer Institute, 5232 Villigen PSI, Switzerland;1. Department of Photonics, Lviv Polytechnic National University, S. Bandera Str. 12, Lviv, 79013, Ukraine;2. Faculty of Mathematics and Natural Sciences, University of Rzeszow, T. Rejtana Str. 16b, Rzeszow, 35959, Poland;1. Post-doctor Station of Electronics Science and Technology, Heilongjiang University, Harbin 150080, China;2. School of Applied Sciences, Harbin University of Science and Technology, Harbin 150080, China;3. Key Laboratory of Electronics Engineering, College of Heilongjiang Province, Heilongjiang University, Harbin 150080, China;1. Department of Molecular and Cell Biology, University of Connecticut, 91 North Eagleville Road, Storrs, CT 06269-3125, United States;2. Ciencia Inc., East Hartford, CT, United States |
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| Abstract: | A highly-sensitive grating-based surface plasmon resonance (SPR) sensor is proposed. The angular interrogation method has been used to study the performance of the sensor, and high sensitivity is obtained if the ?1st diffraction order is used to excite surface plasmon (SP). The sensitivity as well as the width of the SPR curves and reflective amplitude is considered for designing the sensor. Compared with the conventional gold (Au)-based or silver (Ag)-based SPR sensor, it is found that the aluminum (Al)-based sensor has the best performance. The oxidation problem of an Al-based SPR sensor has been addressed by coating it with an ultrathin gold film on the surface. Numerical simulations based on rigorous coupled wave analysis (RCWA) show that the sensitivity of the optimized sensor is 245°/RIU (degree per refractive index unit). |
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