title: Nonlinear optical properties of core-shell nanocavities for enhanced second-harmonic generation.
abstract: 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.
authors.affiliation: Optics Laboratory, School of Engineering, Ecole Polytechnique Fédérale de Lausanne, BM 4.107, Station 17, CH-1015 Lausanne, Switzerland. ye.pu@epfl.ch
authors.forename: Ye
authors.initials: Y
authors.lastname: Pu
authors.forename: Rachel
authors.initials: R
authors.lastname: Grange
authors.forename: Chia-Lung
authors.initials: CL
authors.lastname: Hsieh
authors.forename: Demetri
authors.initials: D
authors.lastname: Psaltis
mesh_terms: D017609:Barium Compounds / Q000737:chemistry; D006046:Gold / Q000737:chemistry; D049329:Nanostructures / Q000737:chemistry*; D017711:Nonlinear Dynamics; D055620:Optical Phenomena; D013057:Spectrum Analysis; D014025:Titanium / Q000737:chemistry
chemical_list: D017609:Barium Compounds; C024547:barium titanate(IV); D006046:Gold; D014025:Titanium