Optical Dispersions of Bloch Surface Waves and Surface Plasmon Polaritons: Towards Advanced Biosensors

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ID: 115966
2019
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Ranked #119 of 812 articles by views in Materials (Basel, Switzerland)

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Abstract
The total internal reflection ellipsometry (TIRE) method was used for the excitation and study of the sensitivity features of surface plasmon polariton (SPP) and Bloch surface waves (BSWs) resonances. For the BSWs generation distributed Bragg gratings were formed on the tops of the substrates (BK7 glass substrate), which had six bilayers of ~120 nm SiO2 and ~40 nm TiO2 and 40 nm of TiO2 on the top. The SPP sample consisted of the BK7 glass prism and a gold layer (45 nm). Numerical calculations of the optical dispersions and the experimental TIRE data have shown that SPP resonance overtake the BSWs in wavelength scanning by a factor of about 17. However, for the ellipsometric parameters Ψ and Δ in the vicinity of excitations, the BSW sensitivity is comparable with SPP. The obtained resolutions were Δ S P P = 7.14 × 10 − 6 R I U , Ψ S P P = 1.7 × 10 − 5 R I U for the SPP and Δ B S W = 8.7 × 10 − 6 R I U , Ψ B S W = 2.7 × 10 − 5 R I U for the BSW. The capabilities of both surface excitations are discussed from the sensitivity point of view in the design of these advanced biosensors.
Reference Key
balevicius2019materialsoptical Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Zigmas Balevicius;Algirdas Baskys;Balevicius, Zigmas;Baskys, Algirdas;
Journal Materials (Basel, Switzerland)
Year 2019
DOI
10.3390/ma12193147
URL
https://www.mdpi.com/1996-1944/12/19/3147/htm
Keywords
surface plasmon polariton silicon oxide optical biosensors bloch surface waves photonic crystals titanium oxide

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