光子集成电路中的超快可编程布拉格反射
Ultrafast programmable Bragg reflection in photonic integrated circuits
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中文总结 AI 辅助
研究基于光子芯片的电信波长可编程分布式布拉格反射器，通过电光诱导折射率对比度形成，实现电压控制布拉格反射及千兆赫兹速度反射率调制，为多领域带来新机遇并建立纳米光子器件新设计策略。
中文摘要 AI 辅助
分布式布拉格反射器（DBR）是经典和量子光子技术的基础构建模块。但其光学响应在制造时通常是固定的，限制了电路在从高速通信到量子计算等应用中的鲁棒性、可重构性和功能性。本文展示了基于光子芯片的电信波长可编程DBR，通过电光诱导薄膜铌酸锂波导中周期性铁电畴之间的折射率对比度形成。实现了从零到近单位的电压控制布拉格反射以及千兆赫兹速度的反射率调制。结果使DBR进入超快可编程领域，为拓扑光子学、腔量子电动力学、集成激光器和光互连带来新机遇。纳米级铁电畴工程与强电光非线性之间的相互作用为纳米光子器件建立了一种新的设计策略，这在体介质中是无法实现的。
英文摘要
Distributed Bragg reflectors (DBRs) are foundational building blocks of classical and quantum photonic technologies. However, their optical responses are typically fixed upon fabrication, limiting circuit robustness, reconfigurability, and functionality in applications from high-speed communications to quantum computing. Here, we demonstrate photonic chip-based programmable DBRs at telecommunications wavelengths, which are formed by electro-optically inducing refractive index contrast between periodic ferroelectric domains in thin-film lithium niobate waveguides. We achieve voltage-controlled Bragg reflection from zero to near-unity, and gigahertz-speed reflectivity modulation. Our results bring DBRs into the ultrafast programmable regime, opening new opportunities in topological photonics, cavity quantum electrodynamics, integrated lasers, and optical interconnects. The interplay between nanoscale ferroelectric domain engineering and strong electro-optic nonlinearity establishes a new design strategy for nanophotonic devices, otherwise inaccessible in bulk media.
