Unveiling the Origin of Third Harmonic Generation in Hybrid ITO–Plasmonic Crystals

A hybrid plasmonic crystal for reaching a higher nonlinear upconversion rate is proposed and the physical mechanism behind the enhancement is unveiled by demonstrating that the nonlinear signal contains a unique spectral fingerprint regarding its origin. This opens new opportunities for understanding and optimizing nonlinear light–matter interactions in complex nanoscale media. As a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials are peer reviewed and may be re-organized for online delivery, but are not copy-edited or typeset. Technical support issues arising from supporting information (other than missing files) should be addressed to the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.