Shen Su, Qiao Wen, Ye Yan, Zhou Yun, Chen Linsen
Opt Express. 2015 Jan 26;23(2):963-70. doi: 10.1364/OE.23.000963.
We propose nano-meanders that can achieve wide-angle band absorption in visible regime. The nano-meander consists of a subwavelength dielectric grating covered by continuous ultra-thin Aluminum film (less than one tenth of the incident wavelength). The excited photonic resonant modes, such as cavity mode, surface plasmonic mode and Rayleigh-Wood anomaly, are discussed in detail. Nearly total resonant absorption due to funneling mechanism in the air nano-groove is almost invariant with large incident angle in transverse magnetic polarization. From both the structural geometry and the nanofabrication point of view, the light absorber has a very simple geometrical structure and it is easy to be integrated into complex photonic devices. The highly efficient angle-robust light absorber can be potential candidate for a range of passive and active photonic applications, including solar-energy harvesting as well as producing artificial colors on a large scale substrate.
我们提出了一种能在可见光范围内实现广角波段吸收的纳米曲折结构。该纳米曲折结构由覆盖有连续超薄铝膜（小于入射波长的十分之一）的亚波长介质光栅组成。详细讨论了激发的光子共振模式，如腔模、表面等离子体模式和瑞利 - 伍德异常。在横向磁极化中，由于空气纳米槽中的漏斗效应机制导致的近乎完全的共振吸收在大入射角下几乎不变。从结构几何形状和纳米制造的角度来看，这种光吸收器具有非常简单的几何结构，并且易于集成到复杂的光子器件中。这种高效的角度鲁棒型光吸收器可能是一系列无源和有源光子应用的潜在候选者，包括太阳能收集以及在大面积基板上产生人造颜色。
