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Efficient photoinduced second-harmonic generation in silicon nitride photonics

TitleEfficient photoinduced second-harmonic generation in silicon nitride photonics
Publication TypeJournal Article
Year of Publication2021
AuthorsX. Lu, G. Moille, A. Rao, D. A. Westly, and K. Srinivasan
JournalNat. Photonics
Volume15
Pagination131+
Date Publishedfeb
ISSN1749-4885
Abstract

Silicon photonics lacks a second-order nonlinear optical (chi((2))) response in general, because the typical constituent materials are centrosymmetric and lack inversion symmetry, which prohibits chi((2)) nonlinear processes such as second-harmonic generation (SHG). Here, we realize high SHG efficiency in silicon photonics by combining a photoinduced effective chi((2)) nonlinearity with resonant enhancement and perfect phase matching. We show a conversion efficiency of (2,500 +/- 100)% W-1 that is two to four orders of magnitude larger than previous field-induced SHG works. In particular, our devices realize milliwatt-level SHG output powers with up to (22 +/- 1)% power conversion efficiency. This demonstration is a breakthrough in realizing efficient chi((2)) processes in silicon photonics, and paves the way for further integration of self-referenced frequency combs and optical frequency references.

DOI10.1038/s41566-020-00708-4