Plasmonic gold nanoshell induced spectral effects and refractive index sensing properties of excessively tilted fiber grating

Binbin Luo; Huafeng Lu; Shenghui Shi; Mingfu Zhao; Jiao Lu; Yajie Wang; Xin Wang

doi:10.3788/COL201816.100603

Journals >Chinese Optics Letters >Volume 16 >Issue 10 >Page 100603 > Article

Chinese Optics Letters
Vol. 16, Issue 10, 100603 (2018)

Plasmonic gold nanoshell induced spectral effects and refractive index sensing properties of excessively tilted fiber grating

Binbin Luo^*, Huafeng Lu, Shenghui Shi^**, Mingfu Zhao, Jiao Lu, Yajie Wang, and Xin Wang

Author Affiliations

Chongqing Key Laboratory of Optical Fiber Sensor and Photoelectric Detection, Chongqing University of Technology, Chongqing 400054, China

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DOI: 10.3788/COL201816.100603 Cite this Article Set citation alerts

Binbin Luo, Huafeng Lu, Shenghui Shi, Mingfu Zhao, Jiao Lu, Yajie Wang, Xin Wang. Plasmonic gold nanoshell induced spectral effects and refractive index sensing properties of excessively tilted fiber grating[J]. Chinese Optics Letters, 2018, 16(10): 100603 Copy Citation Text

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Abstract

We demonstrate a fiber refractive index (RI) sensor based on an excessively tilted fiber grating (ExTFG) immobilized by large-size plasmonic gold nanoshells (GNSs). The GNSs are covalently linked on ExTFG surface. Experimental results demonstrate that both the intensity of the transverse magnetic (TM) and transverse electric (TE) modes of ExTFG are significantly modulated by the localized surface plasmon resonance (LSPR) of GNSs due to the wide-range absorption band. The wavelength RI sensitivities of the TM and TE modes in the low RI range of 1.333–1.379 are improved by ～25% and ～14% after GNSs immobilization, respectively, and the intensity RI sensitivities are ～599%/RIU and ～486%/RIU, respectively.