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首页> 外文期刊>Plasmonics >Study of Light Extinction and Surface Plasmon Resonances of Metal Nanocluster: a Comparison Between Coated and Non-coated Nanogeometry
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Study of Light Extinction and Surface Plasmon Resonances of Metal Nanocluster: a Comparison Between Coated and Non-coated Nanogeometry

机译：金属纳米团簇的消光和表面等离子体共振研究：涂层和非涂层纳米几何的比较

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We suggest a noble design of coated and non-coated nanospheroids to study the tunable behaviour of surface plasmon resonances with different physical environments. Incorporation of coated nanospheroids into the various dielectric media exhibits double dipole plasmonic resonance spectra, which are highly tunable in the visible to infrared regions of the electromagnetic spectrum. The tunability of double dipole peaks and its spectral width depend upon the shape anisotropy of the chosen nanogeometry (especially prolate- and oblate-shaped coated silver and gold nanospheroids). By changing the major and minor axes radii of the inner ellipsoid, there is gradual blue and red shifting in the surface plasmon resonance (SPR) peak position. It was accounted that for the prolate-shaped coated gold nanospheroid with inner radii a (1) = 10 nm and c (1) = 3.8 nm and outer radii a (2) = 16 nm and c (2) = 6.08 nm, two SPR peaks are found at wavelengths 615 and 826 nm. In addition, the tunability of SPR peaks and full width at half maximum (FWHM) value have also been discussed with surrounding media and it was found that the magnitude of the peak extinction is maximum for refractive index N = 2. With the selection of various optical constants of embedding media, the wide tunability of plasmonic resonance spectra that lies in the range of 400-1100 nm has been observed. We have also discussed the advantage of coated nanospheroids over non-coated nanospheroids in the context of tunability of the SPR peak as well as the number of photons absorbed inside the thin-film wafer.
机译：我们建议对涂层和未涂层​​的纳米球体进行高贵的设计，以研究在不同物理环境下表面等离振子共振的可调行为。将涂覆的纳米球体并入各种介电介质中会显示出双偶极等离子体共振光谱，该光谱在电磁光谱的可见光至红外区域具有很高的可调谐性。双偶极子峰的可调谐性及其光谱宽度取决于所选纳米几何形状的形状各向异性（尤其是扁长形和扁形的涂银和金纳米球体）。通过更改内部椭圆体的长轴和短轴半径，表面等离振子共振（SPR）峰值位置将出现逐渐的蓝色和红色偏移。对于内半径为a（1）= 10 nm，c（1）= 3.8 nm，外半径a（2）= 16 nm和c（2）= 6.08 nm的扁长形涂层金纳米球体，有两个在波长615和826 nm处发现SPR峰。此外，还与周围介质讨论了SPR峰的可调性和半峰全宽（FWHM）值，发现对于折射率N = 2，峰消光的幅度最大。在包埋介质的光学常数方面，已经观察到等离子体共振光谱的宽可调性在400-1100 nm范围内。我们还讨论了在SPR峰的可调性以及薄膜晶片内部吸收的光子数的背景下，涂层纳米球体比未涂层纳米球体的优势。

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