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首页> 外文期刊>Plasmonics >The Effect of Metal Type on the Separate Dielectric Layer-Dependent Plasmon Coupling in Al-Au Bimetallic Metal-Dielectric-Metal Nanoshells
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The Effect of Metal Type on the Separate Dielectric Layer-Dependent Plasmon Coupling in Al-Au Bimetallic Metal-Dielectric-Metal Nanoshells

机译：金属类型对Al-Au双金属金属-介电金属纳米壳中介电层依赖的等离子体耦合的影响

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摘要

Metal type-dependent plasmonic absorption properties of Al-Au bimetallic metal-dielectric-metal nanoshells have been investigated theoretically by using the quasi-static theory of classical electrodynamics. It has been found that the three-layered nanoshells present different surface plasmon resonance (SPR) properties when the metal type of the inner core and outer shell is exchanged. For Al-dielectric-Au nanoshell, the |omega(-)(-)> band takes the major role of the absorption spectrum. Whereas for Au-dielectric-Al nanoshell, the |omega(+)(-)> mode has the highest intensity. The corresponding physical origin has been attributed to the different optical parameters of Au and Al, which results in different local field enhancement and plasmon energy at each plasmon hybridization mode. The plasmonic absorption properties also depend on the thickness of the separate layer and are further affected by the metal type of the inner core and outer shell. For Al-dielectric-Au nanoshell, the increasing separate layer thickness results in distinct red shift of |omega(+)(-)> peak but slight blue shift of the |omega(-)(+)> peak. For Au-dielectric-Al nanoshell, the |omega(-)(+)> and |omega(+)(-)> modes fade down and blue shifts, whereas the major peak corresponding to the |omega(-)(-)> mode blue shifts and gets intense firstly and then red shifts and decreases as the thickness is increased. These results indicate that different plasmon hybridization modes of the multilayered nanoshell could be enhanced selectively by choosing different type of metal as the outer shell.
机译：利用经典电动力学的准静态理论，对Al-Au双金属金属-介电金属纳米壳的金属依赖性等离子体吸收性能进行了理论研究。已经发现，当交换内芯和外壳的金属类型时，三层纳米壳具有不同的表面等离子体共振（SPR）特性。对于Al-dielectric-Au纳米壳，|ω（-）（-）>谱带在吸收光谱中起主要作用。对于Au-dielectric-Al纳米壳，|ω（+）（-）>模式具有最高强度。相应的物理起源归因于Au和Al的不同光学参数，这导致在每个等离激元杂交模式下不同的局部场增强和等离激元能量。等离子体吸收特性还取决于分离层的厚度，并且进一步受到内芯和外壳的金属类型的影响。对于Al-dielectric-Au纳米壳，增加的独立层厚度会导致| omega（+）（-）>峰出现明显的红移，但| omega（-）（+）>峰出现轻微的蓝移。对于Au-dielectric-Al纳米壳，| omega（-）（+）>和| omega（+）（-）>模式逐渐减弱并发生蓝移，而对应于| omega（-）（-）的主峰>模式下，蓝色先移动并变强，然后红色随厚度增加而移动并减小。这些结果表明，通过选择不同类型的金属作为外壳，可以选择性地增强多层纳米壳的不同等离激元杂交模式。

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