The aim of this research is to achieve precise detection of multiple physical quantities such as the location of micro-magnetic robots in precision medicine and environmental temperature. In a simulated vascular environment, utilizing the quantum microscope imaging device based on diamond nitrogen vacancy centers, the study successfully characterized the high-precision position of the magnetic robot and its ambient temperature. This achievement provides a technological exploration and foundation for information detection and visual targeting guidance of micro magnetic structures under complex testing conditions, holding potential application value in fields such as micro-robotics, biomedicine, or wearable devices.
With the advancements in nanoscience and technology, the characterization of information regarding micro-magnetic targets and their surrounding environments has seen a sharp rise in demand in fields such as intelligent manufacturing, materials science, and precision instruments. The aforementioned application scenarios not only require precise identification of the positions of micro-magnetic targets but also necessitate feedback on the ambient temperature in which these targets are located. However, achieving non-destructive high-precision detection of micro-magnetic object positions and rapid, non-invasive synchronous measurement characterization of environmental information still poses a significant challenge.
In comparison to electrical detection techniques, magnetic detection holds significant advantages in terms of penetrability and controllability, serving as a vital means for non-invasive testing. However, conventional magnetic field detection methods are constrained by the spatial resolution of the testing probes, failing to meet testing requirements. Novel magnetic sensors based on quantum effects, such as superconducting quantum interference devices, are often restricted by low-temperature conditions and device size.
In response to the current research status, Professor Jun Liu and Professor Jun Tang's team at North University of China proposed a method utilizing diamond nitrogen-vacancy center quantum microscope for synchronous measurements of micro-magnetic object positions and ambient temperature. In a simulated liquid environment, they achieved testing results with high positioning accuracy and temperature detection precision. The related achievements are published in Chinese Optics Letters, Vol. 22, Issue 10, 2024: Zhenrong Shi, Zhonghao Li, Huanfei Wen, Hao Guo, Zongmin Ma, Jun Tang, Jun Liu. Simultaneous detection of position and temperature of micromagnet using a quantum microscope [J]. Chinese Optics Letters, 2024, 22(10): 101202.
In this research endeavor, leveraging the exceptional capabilities of diamond nitrogen-vacancy color centers in magnetic field and temperature synchronous detection, alongside high spatial resolution imaging, and integrating wide-field microscopy imaging technology, a complex testing environment system was developed for the localization of micro-magnetic robots and the imaging characterization of the environmental temperature where these robots operate in applications such as biomedical engineering. This system exhibits high sensitivity in detecting magnetic fields and temperatures, enabling rapid characterization testing of both magnetic fields and temperatures simultaneously, as illustrated in Fig. 1.
In conclusion, the diamond nitrogen-vacancy color center, as a novel quantum sensing functional structure, exhibits unique advantages and application potential in the measurement of micro-magnetic target positions and environmental temperature characterization. The aforementioned research provides significant technical references for applications such as navigation of micro-magnetic robots, targeted medical imaging, and precision therapies.
Fig. 1. (a) Conceptual diagram of experimental principles and testing environment. (b) Schematic diagram of the experimental setup of the quantum microscope.
