Asymmetric light transmission (ALT) or optical diode-like nanodevices have attracted many research interests in recent years for its rosy potential application in all optical computing and information systems. In this work, we propose and numerically demonstrate a bidirectional edge asymmetric light transmission (BE-ALT) device, which is composed by the easy-processing metal/dielectric cylinders arranged periodically on glass substrate. The ALT effect in the proposed BE-ALT device shows a saltation at one critical wavelength, i.e., the asymmetric subtraction owns different signs for the wavelength larger and smaller than the critical wavelength. The asymmetric subtraction designed in this work changes dramatically from − 60% to + 80% at around 600 nm, which can be effectively manipulated by applying different structure parameters. The underlying physical mechanism has been investigated systematically, including the asymmetric diffraction effect, localized surface plasmonic resonance (LSPR), and the waveguide mode (WGM). Our designed BE-ALT device provides a new choice for the practical applications of ALT effect.

近年来，非对称光传输（ALT）或类似光学二极管的纳米器件吸引了许多研究兴趣，因为它在所有光学计算和信息系统中都有着广阔的应用前景。在这项工作中，我们提出并数值演示了双向边缘不对称光传输（BE-ALT）装置，该装置由易于加工的周期性周期性地排列在玻璃基板上的金属/介电圆柱体组成。所提出的BE-ALT器件中的ALT效应在一个临界波长处显示出盐分，即对于大于或小于临界波长的波长，不对称减法具有不同的符号。在这项工作中设计的不对称减法在600 nm左右从− 60％急剧变化为+ 80％，可以通过应用不同的结构参数有效地对其进行处理。已对潜在的物理机制进行了系统研究，包括不对称衍射效应，局部表面等离子体共振（LSPR）和波导模式（WGM）。我们设计的BE-ALT装置为ALT效应的实际应用提供了新的选择。