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首页> 外文期刊>Plasmonics >Substrate-Mediated Broadband Tunability in Plasmonic Resonances of Metal Nanoantennas on Finite High-Permittivity Dielectric Substrate
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Substrate-Mediated Broadband Tunability in Plasmonic Resonances of Metal Nanoantennas on Finite High-Permittivity Dielectric Substrate

机译：有限高介电常数介电基板上金属纳米天线的等离子体共振中基板介导的宽带可调谐性

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摘要

We investigate the optical response of a gold nanocube antenna supported by a high-permittivity dielectric nanocuboid substrate and propose schemes for broadband tailoring of its plasmonic resonances via alteration in image-charge screening. Based on finite-element-method (FEM) simulations-in agreement with filtered-coupled-dipole-approximations (FCDA)-we explore the tunability and spectral evolution of the substrate-supported nanocube's hybridized plasmon modes as functions of the relative permittivity and dimensions of the dielectric substrate. Besides numerical calculations, we also derive simple analytical expressions using image-charge theory to readily estimate the resonance spectral shift-gauging the intense particle-substrate interaction-for a substrate-supported nanocube. Strong localized electric field, around the nanocube's vertices and edges near the substrate, is observed due to the image charges induced in the substrate by the coupled bonding mode arising from hybridization of the primitive dipolar and quadrupolar modes of the nanocube. By introducing slots on the dielectric substrate in the areas around the nanocube's edges where electric field is highly concentrated, we achieve substrate's surface-mediated wideband tunability of plasmonic resonance as functions of the geometric parameters of the slots while maintaining the overall dimensions and material of the nanocuboid substrate. These slots enable dynamic tunability of plasmon resonance by placing graphene flakes on them, which facilitates electrical tailoring of nanocube's plasmon resonance over visible and near-infrared regions. Thus, these proposed schemes would allow one to widely tune the optical responses of any plasmonic nanoantennas using a slotted finite high-permittivity-dielectric substrate for numerous applications in nanophotonic integrated circuits and plasmonic devices.
机译：我们研究了高介电常数纳米立方衬底支撑的金纳米立方体天线的光学响应，并提出了通过改变图像电荷筛选来对其等离子共振进行宽带定制的方案。基于有限元方法（FEM）模拟（与滤波耦合偶极子近似（FCDA）一致），我们研究了衬底支撑的纳米立方体的混合等离子体激元模式作为相对介电常数和尺寸的函数的可调谐性和光谱演化电介质基板的厚度。除数值计算外，我们还使用图像电荷理论导出简单的解析表达式，以轻松估算共振光谱位移，从而衡量了基质支撑的纳米立方体的强烈颗粒与基质之间的相互作用。由于纳米立方体的原始偶极和四极模式的杂交产生的耦合键合模式在基板中感应出的图像电荷，在纳米立方体的顶点和靠近基板的边缘周围观察到了强烈的局部电场。通过在纳米立方体边缘周围电场高度集中的区域中的介电基片上引入狭缝，我们实现了基体的表面介导的等离子共振宽带宽带可调谐性，它是狭缝几何参数的函数，同时保持了晶体的整体尺寸和材料纳米立方基质。这些狭缝通过在其上放置石墨烯薄片，实现了等离子体共振的动态可调性，从而有助于在可见光和近红外区域对纳米立方体的等离子体共振进行电调整。因此，这些提议的方案将允许人们使用带缝隙的有限高介电常数电介质衬底广泛调谐任何等离激元纳米天线的光学响应，以用于纳米光子集成电路和等离激元器件中的许多应用。

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