光学诱导的金刚石光子腔调制与编程
Optically-Induced Modulation and Programming of Diamond Photonic Cavities
- Institute of Physics, Swiss Federal Institute of Technology Lausanne (EPFL)（洛桑联邦理工学院物理研究所）
- Center of Quantum Science and Engineering, Swiss Federal Institute of Technology Lausanne (EPFL)（洛桑联邦理工学院量子科学与工程中心）
- Photonics Research Group, Department of Information Technology (INTEC), Ghent University - IMEC（根特大学信息技朮系光子研究组（与IMEC联合））
- University of Stuttgart（斯图加特大学）
机构由 AI 辅助整理，请以论文原文为准。
中文总结 AI 辅助
本研究展示利用532纳米绿光对含氮-空位中心的金刚石纳米束腔实现全光调制与准永久蓝移调谐，结合热光与电荷效应，最大调谐3.15纳米，为单片金刚石光子平台提供可逆与持久重构能力。
中文摘要 AI 辅助
单晶金刚石结合了卓越的光学、热学和机械性能，同时拥有光学可寻址且自旋相干的色心，使其成为集成量子和非线性光子学的一个有前景的平台。然而，用于动态控制和调谐单片金刚石光子电路的实际后制造机制仍然有限。在此，我们展示了悬浮金刚石法布里-珀罗纳米束腔的全光调制和长寿命调谐，该腔包含氮-空位中心。在532纳米光照下，红外（1000至1100纳米）腔响应由两个竞争贡献主导：一个众所周知的 thermo-optic 红移，以及一个我们归因于自由载流子等离子体色散效应的新型电荷介导蓝移。使用10毫瓦的20千赫调制绿光，我们实现了约45%的可用反射对比度的红外调制深度。绿光照射还产生准永久的光折变共振蓝移，最大观测调谐为3.15纳米（0.87太赫兹），且腔线宽或对比度没有可测量的退化。在铌酸锂泡克尔斯调制器中实现相同的腔移需要跨5微米电极间隙施加200至500伏电压。这些结果建立了一个单片金刚石纳米光子平台，结合了敏捷且可逆的调制与长寿命的光学重构，这是光子技术中的两个关键要素。
英文摘要
Single-crystal diamond combines exceptional optical, thermal, and mechanical properties while hosting optically addressable and spin-coherent colour centres, making it a promising platform for integrated quantum and nonlinear photonics. However, practical post-fabrication mechanisms for dynamically controlling and tuning monolithic diamond photonic circuits remain limited. Here, we demonstrate all-optical modulation and long-lived tuning of suspended diamond Fabry--Perot nanobeam cavities containing nitrogen-vacancy centres. Under 532~nm illumination, the infrared (1000 to 1100~nm) cavity response is governed by two competing contributions: a well-understood thermo-optic red-shift, and a novel charge-mediated blue-shift that we attribute to the free-carrier plasma dispersion effect. With 10~mW of 20~kHz-modulated green light, we achieve an infrared modulation depth of approximately 45\% of the available reflection contrast. Green illumination also produces quasi-permanent photo-refractive resonance blue-shifts, with a maximum observed tuning of 3.15~nm (0.87~THz), without measurable degradation of the cavity linewidth or contrast. Achieving the same cavity shift in a lithium-niobate Pockels modulator would require 200 to 500~V across a \(5~μ\mathrm{m}\) electrode gap. These results establish a monolithic diamond nanophotonic platform combining agile and reversible modulation with long-lived optical reconfiguration, two key ingredients in photonic technologies.
