Mao Yu, Wang JunQiao, Sun Shuai, He Mengyue, Tian Shuo, Liang Erjun
Opt Express. 2022 Jun 20;30(13):22353-22363. doi: 10.1364/OE.457014.
Metamaterial with hyperbolic dispersion properties can effectively manipulate plasmonic resonances. Here, we designed a hyperbolic metamaterial (HMM) substrate with a near-zero dielectric constant in the near-infrared region to manipulate the plasmon resonance of the nano-antenna (NA). For NA arrays, tuning the equivalent permittivity of HMM substrate by modifying the thickness of Au/diamond, the wavelength range of plasmon resonance can be manipulated. When the size of the NA changes within a certain range, the spectral position of the plasmon resonance will be fixed in a narrow band close to the epsilon-near-zero (ENZ) wavelength and produce a phenomenon similar to "pinning effect." In addition, since the volume plasmon polaritons (VPP) mode is excited, it will couple with the localized surface plasmon (LSP) mode to generate a spectrum splitting. Therefore, the plasmon resonance is significantly affected and can be precisely controlled by designing the HMM substrate.
具有双曲线色散特性的超材料能够有效操控等离子体共振。在此，我们设计了一种在近红外区域具有近零介电常数的双曲线超材料（HMM）衬底，以操控纳米天线（NA）的等离子体共振。对于NA阵列，通过改变Au/金刚石的厚度来调节HMM衬底的等效介电常数，可操控等离子体共振的波长范围。当NA的尺寸在一定范围内变化时，等离子体共振的光谱位置将固定在靠近介电常数近零（ENZ）波长的窄带内，并产生类似于“钉扎效应”的现象。此外，由于体等离子体激元（VPP）模式被激发，它将与局域表面等离子体（LSP）模式耦合产生光谱分裂。因此，通过设计HMM衬底，等离子体共振会受到显著影响并能得到精确控制。
