Shklyaev A A, Utkin D E, Tsarev A V, Kuznetsov S A, Anikin K V, Latyshev A V
Novosibirsk State University, 2 Pirogov Str., Novosibirsk, 630090, Russia.
Rzhanov Institute of Semiconductor Physics SB RAS, 13 Lavrentiev Aven., Novosibirsk, 630090, Russia.
Sci Rep. 2022 May 17;12(1):8123. doi: 10.1038/s41598-022-11867-5.
The light reflection properties of Ge disk lattices on Si substrates are studied as a function of the disk height and the gap width between disks. The interdisk spacing effect is observed even at such large gap widths as 500 nm. The gap width decrease leads to the appearance of the reflection minimum in the short wavelength region relative to one originated from the magnetic and electric dipole resonances in individual Ge disks, thereby essentially widening the antireflection properties. This minimum becomes significantly deeper at small gap widths. The observed behavior is associated with the features of the resonant fields around closely spaced disks according to numerical simulation data. The result shows the importance of using structures with geometrical parameters providing the short-wavelength minimum. This can essentially enhance their other resonant properties, which are widely used for applications, in particular, based on collective lattice resonances.
研究了硅衬底上锗盘晶格的光反射特性与盘高和盘间间隙宽度的关系。即使在间隙宽度高达500纳米的情况下，也观察到了盘间间距效应。间隙宽度的减小导致在短波长区域出现相对于单个锗盘中磁偶极子和电偶极子共振所产生的反射最小值，从而显著拓宽了抗反射特性。在小间隙宽度下，这个最小值变得更深。根据数值模拟数据，观察到的这种行为与紧密排列的盘周围的共振场特征有关。结果表明，使用具有提供短波长最小值的几何参数的结构非常重要。这可以显著增强它们的其他共振特性，这些特性广泛应用于特别是基于集体晶格共振的应用中。
