Abstract
In this paper a refractive index sensor based on localized surface plasmon resonance (LSPR) in a Plastic Optical Fiber (POF), is presented and experimentally tested. LSPR is achieved exploiting five-branched gold nanostars (GNS) obtained using Triton X-100 in a seed-growth synthesis. They have the uncommon feature of three localized surface plasmon resonances. The strongest LSPRs fall in two ranges, one in the 600–900 nm range (LSPR 2) and the other one in the 1,100–1,600 nm range (LSPR 3), both sensible to refractive index changes. Anyway, due to the extremely strong attenuation (>102 dB/m) of the employed POF in the 1,100–1,600 nm range, only LSPR 2 will be exploited for refractive index change measurements, useful for bio-chemical sensing applications, as a proof of principle of the possibility of realizing a compact, low cost and easy-to-use GNS based device.
Highlights
localized surface plasmon resonance (LSPR), associated with noble metal nanostructures, creates a sharp spectral absorption and scattering peaks as well as strong electromagnetic near-field enhancements
Sensors based on LSPR in a plastic optical fiber, exploiting gold nanoparticles, present several advantages [2,3]
Among the maximum absorption ranges, we focus on LSPR 2 because it falls just in the spectral interval that can be investigated with the plastic optical fiber (POF) sensor
Summary
LSPR, associated with noble metal nanostructures, creates a sharp spectral absorption and scattering peaks as well as strong electromagnetic near-field enhancements. The Drude model is a purely classical model of electronic transport in conductors It describes the collisions between freely moving electrons and a lattice of heavy, stationary ionic cores; it provides a very good approximation of the conductivity of noble metals. For visible and near-infrared frequencies, the inequality γ
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