Research in Fang group focuses on study of light-matter interactions and light manipulation at micro- and nano-scales. Guided by exploratory theories, research emphasis is given to device demonstrations and multi-scale integrations for addressing challenges in chip-scale optical information processing and optical quantum technology. Current research topics include:

  • Quantum photonics
  • Optomechanics
  • Nanophotonics


  • 2019/12 Kejie wins NSF CAREER Award!
  • 2019/6 Our paper on anomalous quantum Hall effect of light in continuous-wave modulated photonic crystals is published in PRL! (link)
  • 2019/3 Our theoretical proposal on mechanical bound states in the continuum as a new (quantum) optomechanical platform is published in OE with Editor’s Pick! (link)

Representative publications:

K. Fang, J. Luo, A. Metelmann, M. H. Matheny, F. Marquardt, A. A. Clerk, and O. Painter, “Generalized nonreciprocity in an optomechanical circuit via synthetic magnetism and reservoir engineering”,  Nature Physics 13, 465–471 (2017). Link

K. Fang, M. H. Matheny, X. Luan, and O. Painter, “Optical transduction and routing of microwave phonons in cavity-optomechanical circuits”, Nature Photonics 10, 489 (2016). Link

K. Fang, Z. Yu, and S. Fan, “Realizing effective magnetic field for photons by controlling the phase of dynamic modulation”, Nature Photonics 6 782-787 (2012). Link

K. Fang, V. M. Acosta, C. Santori, Z. Huang, K. M. Itoh, H. Watanabi, S. Shikata, and R. G. Beausoleil, “High-sensitivity magnetometry based on quantum beats in diamond nitrogen-vacancy centers”, Physical Review Letters 110, 130802 (2013). Link

K. Fang, Z. Yu, and S. Fan, “Photonic Aharonov-Bohm effect based on dynamic modulation”, Physical Review Letters 108 153901 (2012). Link