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首页> 外文期刊>Optics Letters >Tamm-plasmon and surface-plasmon hybrid-mode based refractometry in photonic bandgap structures
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Tamm-plasmon and surface-plasmon hybrid-mode based refractometry in photonic bandgap structures

机译：光子带隙结构中基于Tamm-等离子体激元和表面等离子体激元混合模式的折光法

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摘要

The transverse magnetic (TM) polarized hybrid modes formed as a consequence of coupling between Tamm plasmon polariton (TM-TPP) mode and surface plasmon polariton (SPP) mode exhibit interesting dispersive features for realizing a highly sensitive and accurate surface plasmon resonance (SPR) sensor. We found that the TM-TPP modes, formed at the interface of distributed Bragg reflector and metal, are strongly dispersive as compared to SPP modes at optical frequencies. This causes an appreciably narrow interaction bandwidth between TM-TPP and SPP modes, which leads to highly accurate sensing. In addition, appropriate tailoring of dispersion characteristics of TM-TPP as well as SPP modes could ensure high sensitivity of a novel SPR platform. By suitably designing the Au/TiO_2/SiO_2-based geometry, we propose a TM-TPP/SPP hybrid-mode sensor and achieve a sensitivity ≥900 nm/RIU with high detection accuracy (≥30 μm~(-1)) for analyte refractive indices varying between 1.330 and 1.345 in 600-700 nm wavelength range. The possibility to achieve desired dispersive behavior in any spectral band makes the sensing configuration an extremely attractive candidate to design sensors depending on the availability of optical sources.
机译：由于Tamm等离子体激元（TM-TPP）模式和表面等离子体激元（SPP）模式耦合而形成的横向磁（TM）极化混合模表现出有趣的色散特性，可实现高度灵敏且精确的表面等离子体激元共振（SPR）传感器。我们发现，在分布式布拉格反射器和金属的界面处形成的TM-TPP模式与光频率下的SPP模式相比具有很强的色散性。这会导致TM-TPP和SPP模式之间的交互带宽明显变窄，从而导致高度精确的感测。此外，适当调整TM-TPP的色散特性以及SPP模式可以确保新型SPR平台的高灵敏度。通过适当设计基于Au / TiO_2 / SiO_2的几何形状，我们提出了一种TM-TPP / SPP混合模式传感器，并实现了对分析物的高检测精度（≥30μm〜（-1））≥900nm / RIU。折射率在600-700 nm波长范围内在1.330和1.345之间变化。在任何光谱带中实现所需色散行为的可能性使传感配置成为根据光源的可用性设计传感器的极具吸引力的候选方案。

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