期刊
APPLIED SURFACE SCIENCE
卷 536, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2020.147869
关键词
Optical sensors; Ellipsometry; Bloch surface waves; Biomolecule detection; Plasmonics
类别
资金
- National Development Agency grants of OTKA [K131515, 2019-2.1.11-TET-2019-00004]
The study demonstrates the design of a Bragg mirror structure with an SiO2 top layer for resonance in the ultraviolet wavelength range, providing enhanced sensitivity for target material absorption. The potential to exceed the sensitivity of plasmon-enhanced measurements is discussed, along with the improvement of the current experimental detection limit.
We designed a Bragg mirror structure with an SiO2 top layer to create a resonance in the ultraviolet wavelength range, near the absorption peak position of various proteins. We demonstrate that the wavelength of enhanced sensitivity can be adjusted by proper design of the 1D photonic structure. The possibility to design the wavelength of enhanced sensitivity supports measurements of better selectivity, optimized for the absorption of the target material. Since the width of the resonant peak in the reflectance spectra can be sharper than those of plasmonics, and they can be positioned at more favourable regions of the instrument and material (e.g., in terms of intensity or selectivity), the sensitivity can exceed those of plasmon-enhanced measurements. In this study we demonstrate the main features of the concept at the example of in situ spectroscopic ellipsometry of fibrinogen adsorption in the Kretschmann-Raether configuration. We realized a resonant peak with a full width at half maximum of 3 nm near the wavelength of 280 nm, which coincides with the absorption maximum of fibrinogen. The influence of depolarization and surface roughness on the measurements, and the potential for improving the current experimental detection limit of 45 mu g/mm(2) is also discussed.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据