title: Digital phase conjugation of second harmonic radiation emitted by nanoparticles in turbid media.
abstract: We demonstrate focusing coherent light on a nanoparticle through turbid media based on digital optical phase conjugation of second harmonic generation (SHG) field from the nanoparticle. A SHG active nanoparticle inside a turbid medium was excited at the fundamental frequency and emitted SHG field as a point source. The SHG emission was scattered by the turbid medium, and the scattered field was recorded by off-axis digital holography. A phase-conjugated beam was then generated by using a phase-only spatial light modulator and sent back through the turbid medium, which formed a nearly ideal focus on the nanoparticle.
authors.affiliation: School of Engineering, EPFL, Station 17, 1015 Lausanne, Switzerland. chia-lung.hsieh@epfl.ch
authors.forename: Chia-Lung
authors.initials: CL
authors.lastname: Hsieh
authors.forename: Ye
authors.initials: Y
authors.lastname: Pu
authors.forename: Rachel
authors.initials: R
authors.lastname: Grange
authors.forename: Demetri
authors.initials: D
authors.lastname: Psaltis