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A highly sensitive fibre-optic nano-displacement sensor based on surface plasmon resonance (SPR) is proposed. The displacement sensing head consists of a single-mode fibre (SMF) with a plasmonic facet and a cladding partly removed single-mode fibre (CPR-SMF) with an air gap. The gold film is deposited on the end of the SMF instead of the flat of the CPR-SMF. The simulation results show that the SPR...
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