Title: Special Researcher
Tel: 86-10-68912634
Department: Physics
E-mail: stephen.chen@bit.edu.cn
Address: School of Physics, Beijing Institute of Technology, No.5 Zhongguancun South Street, Haidian District, Beijing

The research field is optics and condensed matter physics, and the research method is mainly experimental, but also involves theoretical modeling and numerical calculation in related fields. The main research directions are: (1) Quantum optics based on rare earth elements. In the system of rare earth doped solid materials, how to effectively manipulate atoms by optical or microwave means, and develop the application of this system in the field of quantum information. Specifically, it includes how to construct a quantum frequency converter of single microwave photon to single visible photon by using doped crystal, and how to construct a quantum memory at 1550 nm communication band by using doped crystal. (2) The interaction of light and matter in the resonator environment at sub-wavelength scale. The basic problem of the interaction between light and matter is studied by using ultra-low mode volume micro-nano optical cavity. By using small mode volume optical cavity, the interaction between light and matter can be expected to be realized at the level of single atom or single atom or single molecule.

His ancestral home is Wuchuan City, Guangdong Province. In 2008, he received his Bachelor's degree in Optics from the School of Physical Science and Engineering Technology, Sun Yat-sen University. In 2013, he received his Ph. D. degree from the Institute of Physics, Chinese Academy of Sciences. His research direction is micro-nano photonics.

In June 2013, he entered the University of Otago in New Zealand for postdoctoral research. In August 2017, he became a Research Fellow. In June 2018, he joined Beijing Institute of Technology as a pre-appointed associate professor.

Main academic achievements:
A total of 18 articles were published and cited 751 times. Among them, the first author or corresponding author of 9 articles, including 1 Physical Review Letters, 1 Light: Sciences & Applications, 1 Nano Letters, and 1 small letters. The details of the article (see: scholar. Google. Co. nz/citations? user="vIEvAE0AAAAJ&hl=en). International conference invited to report 2 times, reviewer of professional journals New" Journal of Physics, Europhysics Letters, Optics Communications.
Major academic Contributions:
1. For the first time in the world, the concept of optical holography is introduced into the wavefront design of surface plasmon system. It makes the research of using surface metal structure for wave front treatment more simple and effective since 2002. As one of the pioneering work in the field of metasurface, the relevant work has received extensive attention from international peers. Using this research method, the applicant investigates the age-old scientific problem of the behavior of light after passing through a small hole, showing that light can form any given distribution of light field after passing through a small subwavelength hole indicated by a metal. A series of papers based on this principle have been published, with representative papers including Optics Express 19, 23908 (2011), Light: Sciences & Applications 1, e26 (2012).
2. A series of work on constructing full quantum networks using erbium-doped crystals has been carried out earlier in the world. The construction of a quantum frequency converter from microwave to visible light is a key component of a networked quantum computer. We use optical resonators and microwave resonators to enhance light-matter interactions, and propose a frequency conversion method using erbium-doped crystals to achieve a single microwave photon to a single visible photon (Phys. Rev. Lett. 113, 203601 (2014)). Experimentally, we have achieved a maximum quantum efficiency of 10-5 conversion (arXiv:1712.07735).
3. Changes in the spatial pattern distribution of light field caused by the interaction between light and matter have been observed in the micro-nano optical cavity. In the surface plasmonic plasmon system, the strong interaction between plasmonic gap resonance and dye molecules is realized, and the spatial distribution of cavity modes in the presence of interaction is observed in the absence of interaction. Changes (Nano Letters 17, 3246 (2017)).
4. A series of experimental studies were carried out to compensate the ohm loss of surface plasmon by optical gain medium (Applied Physics Letters 98, 261912 (2011); small 8, 1355-1359 (2012); .
5. A series of precise measurements of the hyperfine ground state level of erbium 167 isotope were carried out, including Physical Review B 97, 024419(2018), Physical Review B 94, 075117(2016), etc.