New publication on efficient photoinduced second-harmonic generation in silicon nitride photonics

Xiyuan's latest research on second harmonic generation (SHG) in silicon nitride ring resonators has been published in Nature Photonics. Using a combination of a weak intrinsic χ(2) to kickstart the SHG process, followed by a χ(3) process between the pump, the SHG signal, and a DC field (optically driven by the photogalvanic effect) to amplify the process, we were able to realize efficient SHG (in terms of normalized efficiency, absolute efficiency, and absolute output power) in a silicon-based platform for the first time.  Key to this performance is the ability to phase- and frequency-match widely separated optical modes, whose resonant enhancement enables efficient SHG despite the relatively small effective χ(2) produced in this system.   

Checkout the full article in the latest edition of Nature Photonics! More information can also be found in this JQI news story. 

Lu, X., G. Moille, A. Rao, D. A. Westly, and K. Srinivasan, "Efficient photoinduced second-harmonic generation in silicon nitride photonics", Nature Photonics, pp. 1–6, 2020