Design And Verification Of Radiation Antenna For Wide Field NV Imaging

In recent years,the research focused on the new solid-state quantum spin system is gradually forming a very practical precision sensing and measurement platform.In particular,nitrogen vacancy（NV）,an inherent point defect in diamond,is favored by researchers as a sensitive sensing unit.In room temperature environment,NV color center has the advantages of stable structure,long coherence duration,optical initialization and readout,quantum state control with specific frequency microwave,good biocompatibility and no toxicity,which makes it widely recognized in the fields of nuclear magnetic resonance,semiconductor physics,biomedical and Life Sciences,military and other precision sensing and measurement.If diamond NV color center wants to complete optical detection magnetic resonance,it must manipulate its quantum spin state.At this time,it needs the resonance effect of microwave.Therefore,it is very important to detect the relevant performance of devices or equipment that produce microwave effect,and the radiation antenna in NV color center quantum sensing and precision measurement platform produces microwave effect,so it is very necessary to design and test the radiation antenna.The main research content of this paper is to meet the design and test requirements of microwave uniform radiation characteristics under the wide field NV color center imaging platform.The simulated microwave field with 2.87 GHz resonance and 94%uniformity is simulated by high-frequency simulation software,and the radiation antenna is tested and characterized by the wide field NV imaging platform.Firstly,this paper briefly introduces the performance improvement methods of different parameters in the process of antenna development,and introduces some research results of domestic and foreign researchers on NV color center quantum measurement technology through radiation antenna.Then it explains the substantive research progress of NV color center wide field imaging technology,and reveals that this technology has played a certain role in the detection of a series of microwave devices such as radiation antenna.Then,the basic design theory of radiation antenna and the detection principle of radiation antenna based on wide field NV imaging are described.According to the importance of the radiation antenna to the wide field imaging technology,we designed and built the diamond NV color center imaging measurement platform.In the optical path platform and microwave platform,we carried out the quantum state control of the diamond NV color center,added the external magnetic field bias system to complete its Zeeman splitting,and obtained the corresponding ODMR spectrum through the synchronous timing sequence and processing system.In addition,we also calculate 1μm/pixel imaging system spatial resolution and 35μT/Hz^1/2detection sensitivity of imaging system.Finally,we test the radiation antenna designed by ourselves.Compared with the radiation antenna previously used in the laboratory,the bandwidth is increased by 11.82 times and the radiation efficiency is increased by 71.8%.In addition,in the area of 4.4×4.4 mm²,the uniform area also reached94%.Based on the research contents and conclusions of this paper,it shows that the design and test of radiation antenna is very necessary for wide field NV imaging.At the same time,it also guides the research ideas of quantum nondestructive detection technology for near-field distribution detection and chip diagnosis analysis of other microwave devices.