Controlling collective effects in and positioning of nanocrystals, embedded in polymer waveguides for sensing applications

该项目将结合增材微结构的最新发展与发射体集成的量子光学控制，构建和应用新型的磁场集成传感装置。首先，该项目将开发工具，以确定嵌入纳米晶体，具体的纳米钻石，三维聚合物波导的特征尺寸在微米范围内。其次，该项目将观察、理解和控制氮空位中心的集体效应。具体地说，我们的目标是在基本量子光学水平上理解超辐射的出现及其短时间动力学。此外，我们将研究具有不同偶极子取向的子系间可能的串扰。我们将利用这些知识和自旋到电荷的转换来选择性地改善纳米金刚石中NV中心与聚合物波导模式的耦合。第三，我们将把这些知识与最近发明的金属结构直接激光书写结合起来，在光纤尖端提供真正集成的磁场传感器。它将能够测量生物或不透明介质（例如自旋交叉材料）中最小距离的磁场。因此，我们的项目将为局部和量子光学促进的磁场传感铺平道路。

The project will combine recent developments in additive microstructuring with quantum optical control of ensembles of emitters to construct and apply novel integrated sensing devices for magnetic fields. First, the project will develop tools to deterministically embed nanocrystals, concretely nanodiamonds, into three-dimensional polymer waveguides with feature sizes in the micrometer regime. Second, the project will observe, understand, and control the collective effects of nitrogen-vacancy centers. Specifically, we aim at understanding the emergence of superradiance and its short-time dynamics on a fundamental quantum-optical level. Also, we will study the possible cross-talk between sub-ensembles having different dipole-orientation. We will use this knowledge together with spin-to-charge conversion to selectively improve the coupling of NV centers in one nanodiamond to the mode of a polymer waveguide. Third, we will combine this knowledge with recently invented direct laser writing of metallic structures to provide a genuinely integrated magnetic field sensor on the tip of an optical fiber. It will enable the measuring of magnetic fields at the smallest distances in biological or opaque media such as spin-crossover materials, for example. Our project will thus pave the way for local and quantum-optically facilitated magnetic field sensing.