Subwavelength focusing inside an open disordered medium by time reversal   at a single point antenna
  We study theoretically light focusing at subwavelength scale inside a disordered strongly scattering open medium. We show that broadband time reversal at a single point antenna, in conjunction with near-field interactions and multiple scattering, produces spatial focusing with a quality comparable to that obtained in an ideal closed cavity. This gives new perspectives for super-resolved optical imaging and coherent control of single nanosources or absorbers in complex media. 
Romain Pierrat and C\'edric Vandenbem and Mathias Fink and R\'emi   Carminati
physics.optics