具有吸附纳米粒子阵列的双曲线超材料的光学响应,Nanoscale Horizons

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具有吸附纳米粒子阵列的双曲线超材料的光学响应
Nanoscale Horizons ( IF 8.0 ) Pub Date : 2022-08-15 , DOI: 10.1039/d2nh00015f
Cristian Zagar _{1,

2} , Ferdinand G P Krammer ₂ , John B Pendry ₁ , Alexei A Kornyshev ₂

Affiliation

最近进行了实验研究以确定金纳米粒子阵列、纳米粒子（直径 16 纳米或 40 纳米）吸附在反射基板上的光学效应（Ma et al. , ACS Photonics , 2018, 5 , 4604–4616; Ma et al. , ACS Nano , 2020, 14 , 328–336) 和透明界面 (Montelongo et al. , Nat. Mater. , 2017, 16, 1127–1135)。正如理论所预测的（Sikdar et al. , Phys. Chem. Chem. Phys. , 2016, 18, 20486-20498)，在以纳米粒子局部等离子体共振为中心的频域中，在反射基板上观察到反射猝灭效应。这些结果表明反射率有很大的下降，随着阵列密度的增加，反射率正在加深和红移。相比之下，第二个系统已经显示，也符合理论（Sikdar and Kornyshev, Sci. Rep. , 2016, 6, 1-16)，在同一频域中的宽反射率峰值，强度增加并随着阵列的致密化而变为红色。在本文中，我们开发了吸附在堆叠纳米片双曲线基底表面上的 NP 阵列的光学响应理论。响应在淬灭和增强反射率之间变化，取决于双曲线超材料中金属和介电成分的体积分数。我们在两个相反的极限情况下重现了早期工作的结果——纯金属和纯电介质基板，同时预测了中间成分的新共振。等。,纳特。母校。, 2017, 16 , 1127–1135; 马等人。, ACS 光子学, 2018, 5 , 4604–4616; 马等人。, ACS 纳米, 2020, 14 , 328–336)。因此，我们系统地研究了阵列密度对此类系统光学响应的影响，以后可以通过实验验证。我们还研究了这些发现在双曲线法布里珀罗细胞中的表现。

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Optical response of hyperbolic metamaterials with adsorbed nanoparticle arrays

Experimental studies of have been recently performed to determine the optical effect of adsorption of arrays of gold nanoparticles, NPs (16 nm or 40 nm in diameter) on reflective substrates (Ma et al., ACS Photonics, 2018, 5, 4604–4616; Ma et al., ACS Nano, 2020, 14, 328–336) and on transparent interfaces (Montelongo et al., Nat. Mater., 2017, 16, 1127–1135). As predicted by the theory (Sikdar et al., Phys. Chem. Chem. Phys., 2016, 18, 20486–20498), a reflection quenching effect was observed on the reflective substrates, in the frequency domain centred around the nanoparticle localised plasmon resonance. Those results showed a broad dip in reflectivity, which was deepening and red-shifting with increasing array densities. In contrast, the second system has shown, also in accordance with the theory (Sikdar and Kornyshev, Sci. Rep., 2016, 6, 1–16), a broad reflectivity peak in the same frequency domain, increasing in intensity and shifting to the red with densification of the array. In the present paper, we develop a theory of an optical response of NP arrays adsorbed on the surface of stacked nanosheet hyperbolic substrates. The response varies between quenched and enhanced reflectivity, depending on the volume fractions of the metallic and dielectric components in the hyperbolic metamaterial. We reproduce the results of the earlier works in the two opposite limiting cases – of a pure metal and a pure dielectric substrates, while predicting novel resonances for intermediate compositions. Whereas the metal/dielectric ratio in the hyperbolic substrate cannot be changed in time – for each experiment a new substrate should be fabricated – the density of the adsorbed nanoparticle arrays can be controlled in real time in electrochemical photonic cells (Montelongo et al., Nat. Mater., 2017, 16, 1127–1135; Ma et al., ACS Photonics, 2018, 5, 4604–4616; Ma et al., ACS Nano, 2020, 14, 328–336). Therefore, we systematically study the effect of the array density on the optical response of such systems, which could be later verified experimentally. We also investigate the manifestation of these findings in a hyperbolic-Fabry-Perot cell.

更新日期：2022-08-15

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