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Ultra-low-loss on-chip zero-index materials
Light: Science & Applications ( IF 19.4 ) Pub Date : 2021-01-07 , DOI: 10.1038/s41377-020-00436-y
Tian Dong , Jiujiu Liang , Sarah Camayd-Muñoz , Yueyang Liu , Haoning Tang , Shota Kita , Peipei Chen , Xiaojun Wu , Weiguo Chu , Eric Mazur , Yang Li

Light travels in a zero-index medium without accumulating a spatial phase, resulting in perfect spatial coherence. Such coherence brings several potential applications, including arbitrarily shaped waveguides, phase-mismatch-free nonlinear propagation, large-area single-mode lasers, and extended superradiance. A promising platform to achieve these applications is an integrated Dirac-cone material that features an impedance-matched zero index. Although an integrated Dirac-cone material eliminates ohmic losses via its purely dielectric structure, it still entails out-of-plane radiation loss, limiting its applications to a small scale. We design an ultra-low-loss integrated Dirac cone material by achieving destructive interference above and below the material. The material consists of a square array of low-aspect-ratio silicon pillars embedded in silicon dioxide, featuring easy fabrication using a standard planar process. This design paves the way for leveraging the perfect spatial coherence of large-area zero-index materials in linear, nonlinear, and quantum optics.



中文翻译:

超低损耗的片上零折射率材料

光在零折射率介质中传播而不会累积空间相位,从而实现了完美的空间相干性。这种相干性带来了几种潜在的应用,包括任意形状的波导,无相位不匹配的非线性传播,大面积单模激光器和超辐射扩展。实现这些应用的一个有前途的平台是集成的狄拉克锥材料,该材料具有阻抗匹配的零折射率。尽管集成的狄拉克锥材料通过其纯介电结构消除了欧姆损耗,但它仍然带来面外辐射损耗,从而将其应用限制在小范围内。我们通过在材料上方和下方实现相消干涉,设计了一种超低损耗的集成Dirac锥面材料。该材料由嵌入在二氧化硅中的低纵横比的硅柱的方形阵列组成,可使用标准的平面工艺轻松制造。该设计为利用线性,非线性和量子光学中的大面积零折射率材料的完美空间相干性铺平了道路。

更新日期:2021-01-07
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