High Bloch Surface Waves’ Biosensor Sensitivity Using All‐Dielectric Metasurface

IF 1.9 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Physica Status Solidi A-applications and Materials Science Pub Date : 2024-06-28 DOI:10.1002/pssa.202400259

Malika Chikhi, Louhadj Amina, Fouzia Boukabrine, Nadia Benseddik, Fouad Talbi

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Abstract

A theoretical study of a one‐dimensional photonic crystal (1D‐PhC) [TiO2/MgF2]2/TiO2/GaAs terminated by a dielectric metasurface consisting of periodically arranged TiO2 nanospheres for biosensing is proposed. The p polarized incident beam and the prism couplingtechnique are employed to excite Bloch surface waves considering a low biomolecular concentration sensing medium with refractive index changing from 1.33 to 1.34 RIU. The optical properties of the metasurface layer are calculated within the effective medium approximation. The findings reveal that integrating TiO2 nanosphere metasurfaces as the upper layer of a photonic structure allows simultaneous control of biosensor sensitivity and the reflectance curve's full width at half maximum by judiciously tuning its optical properties, relying on the filling fraction (f) and the size () of the TiO2 nanospheres. Moreover, The results show that the biosensor with the metasurface performs superior to the one without it.

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利用全介质金属表面实现高布洛赫表面波生物传感器灵敏度

本文提出了用于生物传感的一维光子晶体（1D-PhC）[TiO2/MgF2]2/TiO2/GaAs 的理论研究，该晶体由周期性排列的 TiO2 纳米球组成的介电元表面终止。考虑到低生物分子浓度传感介质的折射率在 1.33 到 1.34 RIU 之间变化，采用了 p 偏振入射光束和棱镜耦合技术来激发布洛赫表面波。在有效介质近似条件下计算了元表层的光学特性。研究结果表明，将二氧化钛纳米球元表层作为光子结构的上层，可以根据二氧化钛纳米球的填充分数（f）和尺寸（），通过明智地调整其光学特性，同时控制生物传感器的灵敏度和反射曲线的半最大全宽。此外，研究结果表明，有元表面的生物传感器比没有元表面的生物传感器性能更好。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Physica Status Solidi A-applications and Materials Science 工程技术-材料科学：综合

CiteScore

3.70

自引率

5.00%

发文量

393

审稿时长

2 months

期刊介绍： The physica status solidi (pss) journal group is devoted to the thorough peer review and the rapid publication of new and important results in all fields of solid state and materials physics, from basic science to applications and devices. Among the largest and most established international publications, the pss journals publish reviews, letters and original articles, as regular content as well as in special issues and topical sections.