Extraordinary optical transmission based on subwavelength metallic grating with ellipse walls
Extraordinary optical transmission based on subwavelength metallic grating with ellipse walls
复制标题
基于椭圆壁亚波长金属光栅的非凡光传输
DOI：
10.1364/oe.21.006139
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发表时间：
2013-03-11
期刊：
影响因子：
3.8
通讯作者：
Zou, Helin
中科院分区：
文献类型：
--
作者：
Liang, Yuzhang;Peng, Wei;Zou, Helin
本文提出了一种纳米尺寸的金属薄膜，周期性地被狭窄的狭缝刺穿，其椭圆壁沉积在基底上，展示了宽带非凡光传输（BEOT）的特殊光学特性。与直壁狭缝相比，具有非线性锥形椭圆壁的金属狭缝可以在上表面收集更多的光，这些光耦合成沿着椭圆壁传播的间隙等离子体激元，然后将光从较小的出射狭缝开口处传送。在可见光谱区，TM偏振光的BEOT在共振时具有高达80%的透射率，这是由于基底的存在所激发的零级狭缝共振和高阶狭缝共振同时增强的结果。 BEOT 的光谱范围受到伍德瑞利异常和表面等离子极化激元共振 (SPP) 的限制。还给出了小入射角斜入射的 BEOT 光谱，该光谱分为两个独立的波段，并进行了理论上的分析。这种金属光栅克服了可见光和近红外区域波长尺寸光栅周期结构的低光传输限制。它可用于设计纳米结构BEOT偏振片，它是新型仿生光电系统尤其是天光偏振环境中的重要组成部分。 (c) 2013 年美国光学学会
This paper presents a nanometer-sized metallic film periodically pierced by narrow slits with ellipse walls deposited on a substrate that demonstrates special optical properties of broadband extraordinary optical transmission (BEOT). Compared to slits with straight walls, the metal slits with nonlinearly tapered ellipse walls can collect more light on the upper surface, which is coupled into a gap plasmon polariton propagating along the ellipse walls, then delivers the light at the smaller exit slit opening. In the visible spectral region, BEOT of TM-polarized light is achieved with up to 80% transmission at resonance, which is resulted from the simultaneous enhancement of zero-order slit resonance and higher-order slit resonances excited due to the existence of the substrate. The spectral range of BEOT is limited by Wood-Rayleigh anomalies and surface plasmon polariton resonances (SPPs). The BEOT spectrum of oblique incidence with small incident angle that is divided into two separate bands are also presented and analyzed theoretically. This metallic grating overcomes the low optical transmission limit of the structures with wavelength-sized grating period in visible and near-IR regions. It can be used to design nanostructured BEOT polarizer, which is an important component in novel biomimetic-based optoelectronic systems especially those in skylight polarized environment. (c) 2013 Optical Society of America