Highly sensitive and stable probe refractometer based on configurable plasmonic resonance with nano-modified fiber core

A dispersion model is developed to provide a generic tool for configuring plasmonic resonance spectral characteristics. The customized design of the curve aiming at specific detection requirements can be achieved. According model, probe-type nano-modified fiber optic configurable (NMF-CPR) sensor with tip hot spot enhancement demonstrated measurement refractive index in range 1.3332–1.3432 corresponding low-concentration biomarker solution. new-type sensing structure avoids excessive broadening and redshift dip, which provides more possibilities surface modification other functional nanomaterials. spots nanogaps between Au layer nanostars (AuNSs), electric field AuNSs, high carrier mobility WSe2 synergistically significantly enhance sensitivity sensor. Experimental results show that figure merit enhanced NMF-CPR achieve up 2995.70 nm/RIU 25.04 RIU−1, respectively, are 1.68 times 1.29 higher than those conventional good agreements numerical simulations, demonstrate better level compared similar reported studies, verify correctness model. resolution reaches 2.00×10−5 RIU, obviously side-polished This indicates accuracy dense effectively prevents intermediate nanomaterials from shedding chemical degradation, enables stability. Furthermore, terminal reflective used as practical probe allow convenient operation.