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首页> 外文期刊>Biomedical Engineering: Applications, Basis and Communications >Excitation coupling of Au/ZnO band-gap energy for enhancing the performance of surface plasmon resonance biosensor
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Excitation coupling of Au/ZnO band-gap energy for enhancing the performance of surface plasmon resonance biosensor

机译：Au / ZnO带隙能量的激发耦合以增强表面等离子体共振生物传感器的性能

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摘要

This paper reports a novel design of a surface plasmon resonance (SPR) device that can be developed into a high-performance biosensor. The design utilizes wurtzite crystal structure semiconductor (zinc oxide, ZnO) layers to enhance the SPR signal quality and to improve the full width at half maximum (FWHM) of the SPR reflectivity curve. There exists a new mechanism when the excitation in the plasmon energy is in resonance with the ZnO band-gap (BG) energy transfer process. The excitation energy between Au and ZnO causes an interactive, coupled phenomenon with the ZnO BG (λ_(BG) = 360-430 nm, 3.1-3.4 eV) when it matches the ZnO-Au interface surface plasmon (400 nm). We have optimized the design of the ZnO and Au thin films thicknesses through analytical comparisons with conventional SPR structures. Upon exposure to ethanol, the ZnO-Au device showed a 2-times decrease in the FWHM and a 4.5-times larger shift in intensity interrogation. The ZnO-Au device exhibits a wider linearity range and very higher sensitivity. This characteristic of the ZnO-Au device is the basis for realizing accurate and specific biomolecular detection.
机译：本文报道了一种表面等离子体激元共振（SPR）装置的新颖设计，该装置可以发展为高性能生物传感器。该设计利用纤锌矿晶体结构半导体（氧化锌，ZnO）层来增强SPR信号质量，并改善SPR反射率曲线的半峰全宽（FWHM）。当等离激元能量的激发与ZnO带隙（BG）能量转移过程共振时，存在一种新的机制。当Au和ZnO之间的激发能与ZnO-Au界面等离激元（400 nm）匹配时，会与ZnO BG发生相互作用的耦合现象（λ_（BG）= 360-430 nm，3.1-3.4 eV）。通过与常规SPR结构的分析比较，我们优化了ZnO和Au薄膜厚度的设计。暴露于乙醇中后，ZnO-Au器件的FWHM降低了2倍，强度询问的位移提高了4.5倍。 ZnO-Au器件具有更宽的线性范围和非常高的灵敏度。 ZnO-Au器件的这一特性是实现精确而特异性的生物分子检测的基础。

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