Chinese Optics Letters, 2018, 16 (10): 100603, Published Online: Oct. 12, 2018
Plasmonic gold nanoshell induced spectral effects and refractive index sensing properties of excessively tilted fiber grating Download: 680次
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.
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.