AUTHOR=Xia Di , Huang Yufei , Zhang Bin , Yang Zelin , Zeng Pingyang , Shang Haiyan , Cheng Huanjie , Liu Linghao , Zhang Mingjie , Zhu Ying , Li Zhaohui 

TITLE=On-Chip Broadband Mid-Infrared Supercontinuum Generation Based on Highly Nonlinear Chalcogenide Glass Waveguides

JOURNAL=Frontiers in Physics

VOLUME=Volume 9 - 2021

YEAR=2021

URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2021.598091

DOI=10.3389/fphy.2021.598091

ISSN=2296-424X

ABSTRACT=On-chip mid-infrared (MIR) supercontinuum generation (SCG) covering the molecular functional spectral region (3-12 μm) offers the advantages of robustness, simplicity and compactness. Yet, the spectral range still can’t be expanded beyond 10 μm. In this paper, on-chip ultrabroadband MIR SCG in a high numerical aperture chalcogenide (ChG) waveguide is numerically investigated. The ChG waveguide consisting of a Ge-As-Se-Te core and a Ge-Se upper and lower cladding is designed to optimize the nonlinear coefficients and dispersion profile. By assisting with dispersive wave generation in both short and long-wavelength range, broadband SCG ranging from 2 to 13 µm is achieved. Besides, a fabrication scheme is proposed to realize the precise manipulation of dispersion design. Such results demonstrate that such sources are suitable for compact, chip-integrated molecular spectroscopy applications.