Efficient photo-induced second harmonic generation in silicon nitride photonics.
Nat Photonics
; 15(2)2021.
Article
em En
| MEDLINE
| ID: mdl-38496726
ABSTRACT
Silicon photonics lacks a second-order nonlinear optical (χ(2)) response in general because the typical constituent materials are centro-symmetric and lack inversion symmetry, which prohibits χ(2) nonlinear processes such as second harmonic generation (SHG). Here, we realize record-high SHG efficiency in silicon photonics by combining a photo-induced effective χ(2) nonlinearity with resonant enhancement and perfect-phase matching. We show a conversion efficiency of (2,500 ± 100) %/W, which is 2 to 4 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 major breakthrough in realizing efficient χ(2) processes in silicon photonics, and paves the way for further integration of self-referenced frequency combs and optical frequency references.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Idioma:
En
Revista:
Nat Photonics
Ano de publicação:
2021
Tipo de documento:
Article