过渡金属二硫属化物纳米颗粒超颖表面准陷阱模的多共振
Multiresonances of quasi-trapped modes in metasurfaces based on nanoparticles of transition metal dichalcogenides
摘要：
研究了含孔MoS $_2$圆盘中双各向异性偶极响应同步激发的准陷阱模多重多共振的偏振控制特性。使用解析多极分析的数值计算，我们表明，存在一个强大的光学各向异性的MoS $_2$纳米粒子提供了一个额外的自由度，并允许观察几个共振的电和磁偶极子一次在一个狭窄的光谱范围。基于模拟结果，我们得到了具有孔洞的MoS $_2$圆盘的偶极极化率随频率的变化关系，这使得人们能够区分非局域和双各向异性偶极响应的贡献，并在近红外范围内具有几个特征。利用单个纳米粒子的极化率谱和应用调谐策略，设计了在窄光谱范围内同时支持三个准陷阱模式共振的MoS $_2$超颖表面。这些共振之一对应于1550 nm的电信波长。MoS $_2$超颖表面的光反射光谱的特征在于对应于准陷阱模式的波长的三个窄带凹陷。结果表明，在正交的超颖表面上正常入射的波的偏振的变化导致在每个MoS $_2$磁盘中激发的双各向异性响应的类型的变化，并在接近初始值的波长处的超颖表面的反射光谱中的其他三个功能的激发。
英文摘要：
The features of polarization control of multiple multiresonances for quasi-trapped modes excited by synchronization of bianisotropic dipole responses in MoS$_2$ disks with a hole are considered. Using the numerical calculations with analytical multipole analysis, we showed that the presence of a strong optical anisotropy of MoS$_2$ nanoparticles provides an additional degree of freedom and allows to observe several resonances of electric and magnetic dipoles at once in a narrow spectral range. Based on the simulation results, we obtained the frequency dependences for the dipole polarizabilities of the MoS$_2$ disk with a hole, which allow one to distinguish the contributions of the nonlocal and bianisotropic dipole responses and possessing several features in the near infrared range. Using the polarizability spectra of single nanoparticles and applying the tuning strategy, the design of the MoS$_2$ metasurface supporting three resonances of quasi-trapped modes at once in a narrow spectral range was developed. One of these resonances corresponds to the telecom wavelength of 1550 nm. The spectrum of light reflection for MoS$_2$ metasurface is characterized by three narrowband dips corresponding to the wavelengths of the quasi-trapped modes. It was shown that a change in the polarization of a wave normally incident on the metasurface to orthogonal one leads to a change in the type of bianisotropic response excited in each MoS$_2$ disk and to the excitation of three other features in the reflection spectra of the metasurface at wavelengths close to the initial values.
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