High-Efficient Generation of Nonlinear Optical Effects in Semiconductor Nanowaveguides

Nonlinear optical effects, including second- and third-harmonic generation, and multi-photon luminescence, are found to be excited much more efficiently via evanescent wave coupling. Taking this advantage, we establish a microfiber-based compact device to extract the magnitude and phase information of ultrafast pulse laser. The sensitivity of this configuration can be down to femto-joule level.