Diamond photonics platform enabled by femtosecond laser writing
  We demonstrate the first buried optical waveguides in diamond using focused femtosecond laser pulses. The properties of nitrogen vacancy centers are preserved in the waveguides, making them promising for diamond-based magnetometers or quantum information systems. 
Belen Sotillo, Vibhav Bharadwaj, J. P. Hadden, Masaaki Sakakura,   Andrea Chiappini, Toney Teddy Fernandez, Stefano Longhi, ...
physics.optics