arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2109.09460physics.opticscond-mat.mes-hall
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各向异性MoS $_2$纳米粒子超颖表面中的准陷阱模用于电信光范围内的吸收和偏振控制

Quasi-trapped modes in metasurfaces of anisotropic MoS$_2$ nanoparticles for absorption and polarization control in the telecom optical range

A. V. Prokhorov, A. V. Shesterikov, M. Yu. Gubin, V. S. Volkov, A. B. Evlyukhin

摘要:

我们研究了单材料各向异性纳米二硫化钼(MoS $_2$)及其二维阵列(超表面)在通讯光学范围内的平面波照射下的共振光学响应。被认为是在一个中心和移位孔盘的形式的纳米粒子。使用最近的实验测量的MoS $_2$介电常数和解析多极分析的数值计算,我们表明,材料的各向异性的纳米粒子可以导致特定的非局部贡献,在其磁和电偶极子响应,并影响有效的偶极子极化率。应用一个特殊的程序,我们确定的周期的MoS $_2$超颖表面支持准陷阱模式(QTM)谐振周围的tellecom波长为1550 nm。结果表明,无论单个纳米颗粒的吸收非常弱,QTM的激发导致超颖表面中的有效窄带吸收。研究了垂直入射波的线偏振方向对QTM实现及反射和透射谱的影响。首次发现并证明了由MoS $_2$圆盘组成的超颖表面具有连续双折射介质的性质,其各向异性与超颖表面平面相似。由于这些性质,垂直入射和线性偏振波可以转换为具有改变的偏振的透射和反射波。

英文摘要:

We investigate the resonant optical response of single material-anisotropic nanoparticles (NPs) of molybdenum disulfide (MoS$_2$) and their two-dimensional arrays (metasurfaces) irradiated by plane waves of the telecomunication optical range. Nanoparticles in the form of a disk with centered and shifted hole are considered. Using the recently experimental measured the MoS$_2$ dielectric permittivity and numerical calculations with analytical multipole analysis, we show that the material-anisotropy of NPs can lead to specific nonlocal contributions in their magnetic and electric dipole response and affect the effective dipole polarizabilities. Applying a special procedure we determine the period of the MoS$_2$ metasurfaces supporting the quasi-trapped mode (QTM) resonance around the tellecom wavelength of 1550 nm. It is shown that regardless extremely weak absorption of the single nanoparticles, the excitation of the QTM leads to effective narrowband absorption in the metasurfaces. Influences of the linear polarization direction of normally incident waves on the QTM implementation and the reflection and transmission spectra are studied. It is found and demonstrated, for the first time, that a metasurface, composed of the MoS$_2$ disks with their anisotropy perpendicularto the metasurface plane, has the properties of a continuous birefringent medium. Due to these properties, normally incident and linear-polarized waves can be transformed in the transmitted and reflected waves with changed polarizations.

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