Broadband Asymmetric Light Transmission at Metal/Dielectric Composite Grating.
Broadband Asymmetric Light Transmission at Metal/Dielectric Composite Grating.
复制标题
金属/介质复合光栅的宽带非对称光传输
DOI：
10.1038/s41598-018-19329-7
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发表时间：
2018-01-17
影响因子：
4.6
通讯作者：
Gao F
中科院分区：
文献类型：
--
作者：
Zhu R;Wu X;Hou Y;Zheng G;Zhu J;Gao F
类光学二极管效应由于其在集成光子系统中的潜在应用，近年来引起了人们越来越多的关注。本文提出并数值模拟了一种新型的半球基片上的易加工金属/介质圆柱复合光栅，该光栅可以实现非偏振光在整个可见光区所有衍射模式之和的高对比度非对称透射，并有效地将透射出基片的衍射光引导出去。在380 ~ 780 nm波长范围内，非对称光透射比大于2 dB，在特定波长处，非对称光透射比最大可达13 dB。理论研究表明，金属/介质柱复合光栅结构与衬底一起可以有效激发局域表面等离子体共振（LSPR）效应和波导模（WGM），扩大前后向传输空间的衍射级数和衍射效率差异，从而产生高对比度宽带ALT现象。特别地，降低光栅的对称性可以实现偏振相关ALT。这种易于加工的ALT器件对偏振光和非偏振光都有很高的性能，可以被认为是实际应用中的合适候选者。
Optical diode-like effect has sparked growing interest in recent years due to its potential applications in integrated photonic systems. In this paper, we propose and numerically demonstrate a new type of easy-processing metal/dielectric cylinder composite grating on semi-sphere substrate, which can achieve high-contrast asymmetric transmission of unpolarized light for the sum of all diffraction modes in the entire visible region, and effectively guide the diffraction light transmitting out the substrate. The asymmetric light transmission (ALT) ratio is larger than 2 dB in the waveband from 380 nm to 780 nm and the maximum ALT ratio can reach to 13 dB at specified wavelengths. The thorough theoretical research reveals that the proposed metal/dielectric pillar composite grating structure, together with the substrate, can effectively excite localized surface plasmonic resonance (LSPR) effect and waveguide mode (WGM), and enlarge the diffraction difference between forward and backward transmission spaces, including both number of diffraction orders and diffraction efficiency, thus resulting in high-contrast broadband ALT phenomenon. In particular, lowering the symmetry of the grating can achieve polarization-dependent ALT. Such a type of easy-processing ALT device with high performance for both polarized and unpolarized light can be regarded as suitable candidates in practical applications.
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