Inverse design of coherent supercontinuum generation using free-form nanophotonic waveguides

Many key functionalities of optical frequency combs such as self-referencing and broad spectral access rely on coherent supercontinuum generation (SCG). While nanophotonic waveguides have emerged as a compact and power-efficient platform for SCG, their geometric degrees of freedom have not been full...

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Bibliographic Details
Published in:arXiv.org 2023-12
Main Authors: Chia-Yi, Lee, Liu, Yanwu, Cheng, Yinke, Cheng-Hao Lao, Gong, Qihuang, Qi-Fan, Yang
Format: Article
Language:English
Subjects:
Broadband
Coherence
Free form
Inverse design
Light sources
Optical frequency
Waveguides
Online Access:Get full text
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Summary:Many key functionalities of optical frequency combs such as self-referencing and broad spectral access rely on coherent supercontinuum generation (SCG). While nanophotonic waveguides have emerged as a compact and power-efficient platform for SCG, their geometric degrees of freedom have not been fully utilized due to the underlying nonlinear and stochastic physics. Here, we introduce inverse design to unlock free-form waveguides for coherent SCG. The efficacy of our design is numerically and experimentally demonstrated on Si3N4 waveguides, producing flat and coherent spectra from visible to mid-infrared wavelengths. Our work has direct applications in developing chip-based broadband light sources for spectroscopy, metrology, and sensing across multiple spectral regimes.
ISSN:2331-8422