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Author: search.filters.author.Jaturaphagorn, Pawaphat

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    Investigation on optical integration between LED Mid-IR light sources and Si-based waveguides for sensing applications
    (2022-01-07)
    Jaturaphagorn, Pawaphat
    ;
    Chaisakul, Papichaya
    ;
    Chattham, Nattaporn
    ;
    Limsuwan, Pichet
    Research on mid-IR silicon-based waveguides has recently received strong interest. Particularly, this paper focuses on one of the critical issues in micron-scale photonic integrated circuits, which is to efficiently couple a mid-IR LED (light emitting diode) light source to an external micron-scale waveguide. The optical coupling scheme is crucial for the exploitation of LED light sources in waveguide-based spectroscopic sensing applications. This paper reports optical coupling scheme between an LED mid-IR light source and a silicon rich silicon nitride (SiN) waveguide that could enable the use of LED-based light sources. Finally, the detection limit of the investigated device for carbon dioxide gas detection is calculated.
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    Optimization of end-fire coupling between an LED mid-IR light source and SiNx optical waveguides for spectroscopic sensing
    (2021-12-01)
    Jaturaphagorn, Pawaphat
    ;
    Chattham, Nattaporn
    ;
    Limsuwan, Pichet
    ;
    Chaisakul, Papichaya
    We design and optimize an optical coupling structure between a superluminescent light emitting diodes (SLED) and SiN<inf>x</inf> waveguides for the optical sensing, in which an efficient coupling between these waveguides is challenging due to significant cross-sectional difference. From FDTD investigation, we identify the coupling scheme that is suitable to directly couple light from a SLED into a relatively-thin SiN<inf>x</inf> waveguide suitable for optical sensing based on the evanescent field absorption. The coupling structure is systematically investigated and optimized in terms of refractive indices, coupler's geometrical parameters, and fabrication variations with corresponding detection performance. The coupling scheme could be instrumental in enabling the use of SLED technology in Si-based photonic integrated circuits for sensing applications.
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