Nanostructures And Nanosensors Based On NV Centers In Bulk Diamond

In recent years, as people mastering on the technology of synthetic single-crystal bulk diamond, the research of optical engineering in diamond has been increasing,mostly on the diamond-based nano-technology. And the study of NV centers in dia-mond is widely regarded by academia in the field of quantum information and the high precision quantum sensor.With stable photon emission and long decoherence time at room temperature, NV centers have been applied as an important candidate for practical quantum information techniques. The electronic spin state in the NV center can provide one of promising solid qubits for quantum computation. Moreover, the quantum state of such an elec-tronic spin is very sensitive to the outer environment, which can act as a nanosensor for electromagnetic field, temperature and pressure. And it has been well applied in biology applications.This paper mainly contains the following four achievments, according to the actual work:1. With using both semiconductor technology and finite element simulation as the main methods, for studying the process of single-photon source devices based on NV centers in bulk diamond, several kinds of micro-nano devices, including nanowires,solid immersion lenses, circular bullseye grating, micro-disks and self-supporting films are successfully fabricated. Also the artificial preparations of single NV center in both bulk diamond and nanowires are realized. The experience of these micro-nano process based on bulk diamond is acquired.2. The experimental results of single-photon source from NV centers in diamond nanowires, show that the conical nanowires can improve the single photon collection efficiency of the confocal experiment system with the increase of 7 times, compared with that in bulk diamond. And the detected single-photon rate can be at 564kcps.This nanowire single-photon device with high photon flux can be used to improve the performance of quantum information processing. More importantly, it can also provide an effective solution for nanoscale sensing and measurement.3. By optical far-field microscope technique based on NV centers ensemble in bulk diamond, the super-resolution imaging of micro-nano structures on diamond surface is obtained. This technique uses arrays of high density NV centers as near-field optical probes, which are artificially prepared in bulk diamond. The local optical field, which transmits through the nanostructures on the diamond surface, is measured by detecting the charge state conversion of the NV center. Locating the NV center with a spatial resolution of 6.1 nm is realized with charge state depletion nanoscopy. The nanostruc-tures on the surface of the diamond are then imaged with a resolution below the optical diffraction limit. The results offer an approach to build a general-purpose optical super-resolution microscopy technique and a convenient platform for high spatial resolution quantum sensing with NV centers.4. By the study of simulation, optimization, processing and packaging of the mi-crowave devices, a nanosensor with integrated high-quality microwave antenna is real-ized, which is used for the optical far-field super-resolution microscopy based on quan-turn sensing with NV centers. In addition, this paper also introduced the application of computer vision and other artificial intelligence technology in the experimental detec-tion and sample preparation. And these related procedures are open-source for other similar research, providing some reference and technical accumulation.These four achievments above are all closely towards the goal of NV nano-sensing from many aspects of multi-angle research. In this the research on both nano-size sensor and nano imaging has achieved initial results. The future, the advanced technology of quantum sensor combined with optical super-resolution imaging based on NV centers in diamond and the application of this technology in interdisciplinary research like biology and materials science can be continued to work on.