Photonic Crystals for Enhanced Light Extraction from 2D Materials
Photonic Crystals for Enhanced Light Extraction from 2D Materials
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DOI：
10.1021/acsphotonics.6b00779
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发表时间：
2016-12-01
期刊：
影响因子：
7
通讯作者：
Young, Robert J.
中科院分区：
文献类型：
--
作者：
Noori, Yasir J.;Cao, Yameng;Young, Robert J.
近年来，人们对一系列二维过渡金属二硫族化合物（TMDs）进行了研究，并证明了它们具有显著的光学和电子特性。此外，弱层间范德华相互作用允许tmd适应一系列衬底。不幸的是，从这些TMD单层发射的光子很难有效地收集到简单的光学器件中，从而降低了这些材料的实用性。实现用于量子信息应用的片上光学器件需要最大化光提取效率同时最小化衬底损耗的结构。在这项工作中，我们提出了一个基于硅棒的光子晶体腔，它允许TMD单层和腔模式之间最大的空间和光谱耦合。时域有限差分模拟表明，与平面基底上的单层相比，与这种类型的腔相耦合的tmd具有向集合光学高度定向发射的特性，并且发光强度提高了400%。我们考虑了实际的制造公差，并讨论了与腔模场最大值可实现的空间对准的程度。
In recent years, a range of two-dimensional transition metal dichalcogenides (TMDs) have been studied, and remarkable optical and electronic characteristics have been demonstrated. Furthermore, the weak interlayer van der Waals interaction allows TMDs to adapt to a range of substrates. Unfortunately, the photons emitted from these TMD monolayers are difficult to efficiently collect into simple optics, reducing the practicality of these materials. The realization of on-chip optical devices for quantum information applications requires structures that maximize optical extraction efficiency while also minimizing substrate loss. In this work we propose a photonic crystal cavity based on silicon rods that allows maximal spatial and spectral coupling between TMD monolayers and the cavity mode. Finite difference time domain simulations revealed that TMDs coupled to this type of cavity have highly directional emission toward the collection optics, as well as up to 400% enhancement in luminescence intensity, compared to monolayers on flat substrates. We consider realistic fabrication tolerances and discuss the extent of the achievable spatial alignment with the cavity mode field maxima.