Fluorescent diamond microparticles doped glass fiber for magnetic field sensing

Near-field energy transfer between a luminescent 2D material and color centers in diamond

Energy transfer between fluorescent probes lies at the heart of many applications ranging from bio-sensing and -imaging to enhanced photo-detection and light harvesting. In this work, we study Förster resonance energy transfer (FRET) between shallow defects in diamond --- nitrogen-vacancy (NV) centers --- and atomically-thin, two-dimensional materials --- tungsten diselenide (WSe$_2$). By means of fluorescence lifetime imaging, we demonstrate the occurrence of FRET in the WSe$_2$/NV system. Further, we show that in the coupled system, NV centers provide an additional excitation pathway for WSe…

Magnetic Field Fingerprinting of Integrated Circuit Activity with a Quantum Diamond Microscope

Current density distributions in active integrated circuits (ICs) result in patterns of magnetic fields that contain structural and functional information about the IC. Magnetic fields pass through standard materials used by the semiconductor industry and provide a powerful means to fingerprint IC activity for security and failure analysis applications. Here, we demonstrate high spatial resolution, wide field-of-view, vector magnetic field imaging of static (DC) magnetic field emanations from an IC in different active states using a Quantum Diamond Microscope (QDM). The QDM employs a dense lay…

利用掺杂富NV亚微米金刚石的光纤和零场共振定位宏观磁场源

Localization of macroscopic sources of magnetic field using optical fibers doped with NV-rich sub-micron diamonds and zero-field resonance

本文提出掺杂随机取向富NV亚微米金刚石的光纤零场共振方法，无需射频场、机械扫描或特定NV取向即可遥感并定位宏观磁场源及其空间分布。

Microscopic-scale recording of brain neuronal electrical activity using a diamond quantum sensor

An important tool in the investigation of the early stages of neurodegenerative disease is the study of dissected living tissue from the brain of an animal model. Such investigations allow the physical structure of individual neurons and neural circuits to be probed alongside neuronal electrical activity, disruption of which can shed light on the mechanisms of emergence of disease. Existing techniques for recording activity rely on potentially damaging direct interaction with the sample, either mechanically as point electrical probes or via intense focused laser light combined with highly spec…

Ion sensors with crown ether-functionalized nanodiamonds

Alkali metal ions such as sodium and potassium cations play fundamental roles in biology. Developing highly sensitive and selective methods to both detect and quantify these ions is of considerable importance for medical diagnostics and bioimaging. Fluorescent nanoparticles have emerged as powerful tools for nanoscale imaging, but their optical properties need to be supplemented with specificity to particular chemical and biological signals in order to provide further information about biological processes. Nitrogen-vacancy (NV) centers in diamond are particularly attractive as fluorescence ma…

金纳米颗粒悬浮液中的电-热-等离子体流动：非线性流速对聚集体浓度的依赖性

Electro-Thermo-Plasmonic Flow in Gold Nanoparticle Suspensions: Nonlinear Flow Velocity Dependence with Aggregates Concentration

本研究结合模拟与实验，发现金纳米颗粒悬浮液在激光和电场作用下产生的电热等离子体流动速度与颗粒浓度呈非线性关系，源于多重散射吸收增强，并可用于实现高速流动。