In the past two decades, index-near-zero (INZ) modes and materials, with their spatial phase invariance and super coupling, gained increasing attention for applications in all-optical/quantum computing and communication. However, the modulation of INZ modes is typically complex and discontinuous, often achieved through intricate experimental methods, thereby hindering their widespread application. Here, we propose two deep-subwavelength magneto-optical one-way waveguides and discover three broadband tunable INZ modes, exhibiting predictable behavior dependent on the external magnetic field (EMF). By utilizing these INZ modes, we design broadband tunable all-optical phase modulators through straightforward EMF control. The tunable and predictable nature of INZ modes, combined with deep-subwavelength phase modulators, may advance miniaturized all-optical communication and computation.

中文翻译：

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跨连续和宽带的精确可调和可预测的指数接近零模式

在过去的二十年中，近零折射率（INZ）模式和材料以其空间相位不变性和超耦合性，在全光/量子计算和通信中的应用受到越来越多的关注。然而，INZ模式的调制通常是复杂且不连续的，通常通过复杂的实验方法来实现，从而阻碍了其广泛应用。在这里，我们提出了两种深亚波长磁光单向波导，并发现了三种宽带可调谐 INZ 模式，表现出依赖于外部磁场 (EMF) 的可预测行为。通过利用这些 INZ 模式，我们通过简单的 EMF 控制设计了宽带可调谐全光相位调制器。 INZ 模式的可调谐和可预测特性与深亚波长相位调制器相结合，可能会推进小型化全光通信和计算。