| Autor: |
Dmitrii Belogolovskii, Nikola Alic, Andrew Grieco, Yeshaiahu Fainman |
| Jazyk: |
angličtina |
| Rok vydání: |
2024 |
| Předmět: |
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| Zdroj: |
Advanced Photonics Research, Vol 5, Iss 10, Pp n/a-n/a (2024) |
| Druh dokumentu: |
article |
| ISSN: |
2699-9293 |
| DOI: |
10.1002/adpr.202400017 |
| Popis: |
Silicon nitride is widely used in integrated photonics for optical nonlinear wave mixing due to its low optical losses combined with relatively high nonlinear optical properties and a wide‐range transparency window. It is known that a higher concentration of Si in silicon‐rich nitride (SRN) magnifies both the nonlinear response and optical losses, including nonlinear losses. To address the trade‐off, four‐wave mixing (FWM) is implemented in over a hundred SRN waveguides prepared by plasma‐enhanced chemical vapor deposition in a wide range of SRN refractive indices varying between 2.5 and 3.2 (measured in the C‐band). It is determined that SRN with a refractive index of about 3 maximizes the FWM efficiency for continuous‐wave operation, indicating that the refractive index of SRN is indeed a crucial optimization parameter for nonlinear optics applications. The FWM efficiency is limited by large nonlinear optical losses observed in SRN waveguides with indices larger than 2.7, which are not related to two‐photon absorption. Finally, the third‐order susceptibility χ3 and the nonlinear refractive index n2 are estimated for multiple SRN refractive indices, and, specifically, the nonlinearities as large as χ3=(12.6±1.4)×10−19 m2 V−2 and n2=(7.6±0.8)×10−17 m2 W−1 are estimated in a waveguide with an SRN refractive index of 3.2. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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