Cavity-enhanced linear dichroism in a van der Waals antiferromagnet
Cavity-enhanced linear dichroism in a van der Waals antiferromagnet
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DOI：
10.1038/s41566-022-00970-8
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发表时间：
2022-02
期刊：
影响因子：
35
通讯作者：
Huiqin Zhang;Z. Ni;C. Stevens;Aofeng Bai;F. Peiris;J. Hendrickson;Liang Wu;D. Jariwala
中科院分区：
文献类型：
--
作者：
Huiqin Zhang;Z. Ni;C. Stevens;Aofeng Bai;F. Peiris;J. Hendrickson;Liang Wu;D. Jariwala
光学双折射是广泛用于光子的过滤和分束的晶体的基本光学性质。双折射晶体同时具有线性二向色性（LD）的性质，其允许具有两种不同偏振的光的不对称传播或衰减。LD的这种性质已经从小分子到聚合物和晶体进行了广泛的研究，但很少按需设计。在这里，我们使用新发现的自旋-电荷耦合在货车范德华反铁磁绝缘体FePS 3诱导大的面内光学各向异性，从而LD。我们报告说，在这个反铁磁绝缘体的LD是可调谐的光谱和其幅度作为腔耦合的函数。我们证明了在可见光-近红外范围内，在腔耦合FePS 3晶体的近单位LD，并推导出其色散作为腔长和FePS 3厚度的函数。我们的研究结果具有广泛的意义，使用腔调谐LD作为强相关量子材料的诊断探针，并提供了新的机会，小型化，片上分束器和可调谐滤波器。
Optical birefringence is a fundamental optical property of crystals widely used for filtering and beam splitting of photons. Birefringent crystals concurrently possess the property of linear dichroism (LD), which allows asymmetric propagation or attenuation of light with two different polarizations. This property of LD has been widely studied from small molecules to polymers and crystals but has rarely been engineered on demand. Here we use the newly discovered spin-charge coupling in the van der Waals antiferromagnetic insulator FePS3to induce large in-plane optical anisotropy and consequently LD. We report that the LD in this antiferromagnetic insulator is tunable both spectrally and in terms of its magnitude as a function of the cavity coupling. We demonstrate near-unity LD in the visible–near-infrared range in cavity-coupled FePS3crystals and derive its dispersion as a function of the cavity length and FePS3thickness. Our results hold wide implications for the use of cavity-tuned LD as a diagnostic probe for strongly correlated quantum materials and offer new opportunities for miniaturized, on-chip beamsplitters and tunable filters.