Digital phase conjugation of second harmonic radiation emitted by nanoparticles in turbid media

Opt Express. 2010 Jun 7;18(12):12283-90. doi: 10.1364/OE.18.012283.


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.

Publication types

  • Research Support, Non-U.S. Gov't