Nonlinear Optical Properties of Core-Shell Nanocavities for Enhanced Second-Harmonic Generation
A nonlinear optical plasmonic core-shell nanocavity is demonstrated as an efficient, subwavelength coherent light source through second-harmonic generation. The nonlinear optical plasmonic nanocavity incorporates a noncentrosymmetric medium, which utilizes the entire mode volume for even-order nonlinear optical processes. In previous plasmonic nanocavities, enhancement of such processes was only possible at the interface but symmetry prohibited in the body. We measured an enhancement of over 500 times in the second-harmonic radiation power. Calculations show that an enhancement of over 3500 times is achievable.
Additional Information© 2010 The American Physical Society. Received 7 January 2010; published 19 May 2010. This work was supported by Swiss National Center of Competence in Research (NCCR), Quantum Photonics. We thank Paul Bowen of the Powder Technology Laboratory at EPFL for kindly supplying BaTiO3 nanocrystals to us.
Published - Pu2010p10320Phys_Rev_Lett.pdf
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