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Title: Optical Dispersions of Bloch Surface Waves and Surface Plasmon Polaritons: Towards Advanced Biosensors
Authors: Balevičius, Zigmas
Baškys, Algirdas
Keywords: bloch surface waves
surface plasmon polariton
optical biosensors
photonic crystals
silicon oxide
titanium oxide
Issue Date: 2019
Publisher: MDPI
Citation: Balevicius, Z.; Baskys, A. Optical Dispersions of Bloch Surface Waves and Surface Plasmon Polaritons: Towards Advanced Biosensors. Materials 2019, 12, 3147.
Series/Report no.: 12;19
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 ΔSPP=7.14×10−6RIU , ΨSPP=1.7×10−5RIU for the SPP and ΔBSW=8.7×10−6RIU , ΨBSW=2.7×10−5RIU for the BSW. The capabilities of both surface excitations are discussed from the sensitivity point of view in the design of these advanced biosensors.
Description: This article belongs to the Special Issue Multifunctional Nanostructured Silicon Composites
URI: http://dspace.vgtu.lt/handle/1/3904
ISSN: 1996-1944
Appears in Collections:Moksliniai straipsniai / Research articles

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