[论文解读] MoOCl$_2$ as a Hyperbolic Planar Platform for Nanooptics at Telecom Frequencies

Haozhe Tong, Clara Clemente-Marcuello+3 more|arXiv (Cornell University)|Feb 9, 2026

Strong Light-Matter Interactions被引用 0

一句话总结

论文预测 MoOCl2 在电信窗口直接工作的双曲极化子，概述其在片上纳米光子学和器件概念方面的潜力。

ABSTRACT

On-chip optoelectronics is fundamental to modern telecommunication, yet the diffraction limit of light remains a major obstacle to the extreme miniaturization of photonic integrated circuits (PICs). Hyperbolic polaritons (HPs) $-$ hybrid light-matter excitations in materials with opposite-signed dielectric permittivity tensor components $-$ offer a solution through their ability to support deep sub-wavelength confinement and unique optical phenomena such as canalization and negative refraction. To date, however, the most widely studied hyperbolic van der Waals (vdW) crystals, including hBN and $α$-MoO$_3$, operate mainly in the mid-infrared, leaving the telecommunication bands (1260$-$1675 nm) largely uncovered. Here, we predict HPs operating directly in the telecommunication window in the vdW crystal molybdenum oxychloride (MoOCl$_2$). Building on recent evidence that MoOCl$_2$ can support plasmon polaritons in the visible, we theoretically investigate its optical response at telecom wavelengths and identify the conditions under which strongly confined, canalized HPs modes emerge. Beyond establishing a telecom platform, we outline device-level opportunities enabled by these modes, including diffraction-free waveguides based on canalization, tunable polaritonic crystals, and high-efficiency spontaneous emission-enhancement platforms. These paradigms cover the essential pillars of on-chip information processing: emission, propagation, modulation and detection. Our results establish MoOCl$_2$ as a potentially transformative material that bridges physics of hyperbolic PPs with potential practical implementations, opening avenues for ultra-compact, high-density, and low-power photonic components.

研究动机与目标

• 通过克服光子集成电路的衍射极限来推动片上光电子学。
• 在 MoOCl2 的电信频率窗口（1260–1675 nm）内识别双曲极化子模式。
• Demonstrate strong sub-wavelength confinement and canalization in MoOCl2 for nanooptics.
• Outline device-level opportunities enabled by these modes for emission, propagation, modulation, and detection.

提出的方法

• 理论研究 MoOCl2 在电信波长的光学响应。
• 确定出现强约束、可管道化的双曲极化子的条件。
• 利用之前关于 MoOCl2 在可见波段支持等离子子极化子的证据扩展到电信波段。

实验结果

研究问题

• RQ1 在电信频率下，MoOCl2 何种条件下会出现双曲极化子？
• RQ2 MoOCl2 能否在电信窗口实现管道化、无衍射的波导？
• RQ3 在 MoOCl2 的电信双曲极化子下，哪些器件概念（发射增强、可调极化子晶体）变得可行？

主要发现

• MoOCl2 可以直接在电信窗口承载双曲极化子。
• 在电信波长预测出现强约束的管道化极化子模。
• 潜在的器件概念包括无衍射波导、可调极化子晶体，以及高效发射增强。