https://research.ibm.com/publications/high-gain-si-chip-optical-parametric-mixing-beyond-two-photon-absorption
High-gain Si-chip optical parametric mixing beyond two-photon absorption for PHOTINICS 2010 - IBM...
High-gain Si-chip optical parametric mixing beyond two-photon absorption for PHOTINICS 2010 by William M. J. Green et al.