Sub-wavelength light localization in nanorod chain enhances second-harmonic generation.
We demonstrate that nonlinear dielectric nanorod chains enhance the second-harmonic generation by taking advantage of subwavelength light confinement. We report a conversion efficiency higher than 10% for only 200 W input pump peak power in a 20 nanorod chain possessing a nonlinear susceptibility chi(2) = 10 pm/V. This giant frequency conversion is shown to originate from a lateral squeezing of the fundamental guided mode and from the combination of slow light at both frequencies omega and 2 omega. These results open an interesting route for the design of highly integrated efficient nonlinear devices.
Ciracì
Cristian
C
GES UMR-CNRS 5650, Université Montpellier II, Place E. Bataillon, CC074, 34095 Montpellier, France. ciraci@ges.univ-montp2.fr
Centeno
Emmanuel
E