Improving the sensitivity of fiber-optic SPR sensor via radially polarized beam excitation |
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| Authors: | Jie Yan Yonghua Lu Pei Wang Chun Gu Rongsheng Zheng Yong Chen Hai Ming Qiwen Zhan |
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| Institution: | 1. Department of Physics,University of Science and Technology of China,Anhui Key Laboratory of Optoelectronic Science and Technology,Hefei 230026,China
2. Electro-Optics Graduate Program,University of Dayton,300 College Park,Dayton,Ohio 45469-0245,USA |
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| Abstract: | We study the sensing properties of an intensity-modulated fiber-optic surface plasmon resonance (SPR) sensor using radially polarized beam (RPB).Because of the rotational symmetry of fiber and RPB,surface plasmon can be excited more efficiently atthe sensor surface,which results in an obvious improvement of the sensitivity.Our experiments demonstrate that the sensitivity in the case of RPB illumination is three times higher than that of linearly polarized beam illumination. |
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