Time: 9 March 2023, 2 p.m.
Sites: Multi-function Hall 502, New Optoelectronics Building, Shanghai Institute of Technology (East side of the building)
Title: Micro- and nano-quantum sensing based on diamond NV colour cores
Abstract: Diamond nitrogen-vacancy (NV) colour centers, because of their excellent optical and spin properties, have become quantum probes that can simultaneously achieve high spatial resolution and high measurement sensitivity, and are widely used in measurements of electromagnetic fields, temperature, pressure, and other physical quantities at the micro- and nanoscale. In this presentation, we will introduce charge state depletion (CSD) nano-imaging based on charge state manipulation and its application to micro- and nano-scale quantum sensing. We propose and develop CSD nano-imaging for nanoscale spatially resolved electron spin quantum state manipulation and detection. Combined with micro-nano optical field and quantum state modulation techniques, it enables versatile high spatial resolution and high sensitivity non-destructive measurements of physical quantities, such as optical field intensity, local field energy density, current, and magnetic field. We have recently discovered a new phenomenon of ultrasmall local field of electromagnetic field by using this CSD nano-imaging and highly sensitive quantum sensing technology. Based on this ultra-small local field, combined with an optical antenna, we have improved the strength of electromagnetic field-matter interaction by four orders of magnitude, and applied it to the study of microwave positioning, achieving micrometre-level positioning accuracy.
Rapporteur's profile
Fangwen Sun is a professor at the School of Physics, University of Science and Technology of China (USTC), where he received his B.S. and Ph.D. degrees in 2001 and 2007, respectively. He was awarded the National 100 Outstanding Doctoral Dissertation Award and the Optics Award of the Optical Society of China for young and middle-aged scientists and technicians by Wang Daheng, and is a recipient of the National Outstanding Youth Fund and the Young Changjiang Scholars of the Ministry of Education of China. He has been engaged in research on the theory and experiment of quantum optics and quantum information. He has published more than 100 articles as the main author in journals such as Nature subjournals. He has presided over scientific research projects of the Ministry of Science and Technology and the China Foundation for Science and Technology.
