Realization of high-dimensions frequency crystals in electro-optic microcombs
Realization of high-dimensions frequency crystals in electro-optic microcombs
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DOI：
10.1364/optica.395114
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发表时间：
2020-09-20
期刊：
影响因子：
10.4
通讯作者：
Loncar, Marko
中科院分区：
文献类型：
--
作者：
Hu, Yaowen;Reimer, Christian;Loncar, Marko
晶体在自然界中无处不在，是材料研究、固态科学和量子物理学的核心。不幸的是，固态晶体的可控性受限于多体动力学的复杂性和缺陷的存在。相比之下，由光学晶格等实现的合成晶体结构，最近使得以可控的方式研究各种物理过程，甚至研究新现象成为可能。然而，过去合成光学晶体的实现在尺寸和维度上是有限的。在这里，我们从理论上提出并实验证明了任意尺寸的光学频率晶体，由片上电光频率梳内的数百个耦合光谱模式组成。我们展示了在一、二、三、四维中测量的光透射光谱与频率晶体态密度之间的直接联系，并且没有进一步扩展维度的限制。我们证明了经典电光频率梳的产生可以被描述为一个紧密结合模型中的随机游走过程，并通过测量光学稳态的相干分布验证了这一点。我们相信我们的平台是在频域探索拓扑和量子光子学的一个有前途的候选者。(C) 2020年美国光学学会根据OSA开放获取出版协议的条款
Crystals are ubiquitous in nature and are at the heart of material research, solid-state science, and quantum physics. Unfortunately, the controllability of solid-state crystals is limited by the complexity of many-body dynamics and the presence of defects. In contrast, synthetic crystal structures, realized by, e.g., optical lattices, have recently enabled the investigation of various physical processes in a controllable manner, and even the study of new phenomena. Past realizations of synthetic optical crystals were, however, limited in size and dimensionality. Here we theoretically propose and experimentally demonstrate optical frequency crystal of arbitrary dimensions, formed by hundreds of coupled spectral modes within an on-chip electro-optic frequency comb. We show a direct link between the measured optical transmission spectrum and the density of states of frequency crystals in one, two, three, and four dimensions, with no restrictions to further expanding the dimensionality. We demonstrate that the generation of classical electro-optic frequency comb can be modeled as a process described by random walks in a tight-binding model, and we have verified this by measuring the coherent distribution of optical steady states. We believe that our platform is a promising candidate for exploration of topological and quantum photonics in the frequency domain. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement