Ultra-low-loss on-chip zero-index materials

• 作者: Tian Dong Jiujiu Liang Sarah Camayd-Mu?oz Yueyang Liu Haoning Tang Shota Kita Peipei Chen Xiaojun Wu Weiguo Chu Eric Mazur Yang Li
• 来源期刊: 光：科学与应用（英文版）
• 年，卷（期）: 2021,（1）
• 所属期刊栏目: Articles
• 页码范围: 106-114
• 页数: 9页
• 语种: 英文

摘要

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.