Digital phase conjugation of second harmonic radiation emitted by nanoparticles in turbid media
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.
Additional Information© 2010 Optical Society of America. Received 19 Apr 2010; revised 19 May 2010; accepted 23 May 2010; published 25 May 2010. The authors thank Dr. Paul Bowen at EPFL for providing the BaTiO3 nanocrystals. This project is supported by the National Center of Competence in Research (NCCR), Quantum Photonics.
Published - Hsieh2010p10535Opt_Express.pdf