Design of photonic waveguides at Mid-infrared wavelengths on a SOI platform

Madhurima, Vankdavat and Emani, Naresh Kumar (2019) Design of photonic waveguides at Mid-infrared wavelengths on a SOI platform. Masters thesis, Indian institute of technology Hyderabad.

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Abstract

The need of designing the waveguide from near infrared region and extending the work to midinfrared region is discussed. A rib waveguide is designed to work at telecommunication wavelength 1.55 µm in the regime of silicon photonics and the modes are reviewed. By optimising geometric parameters of the waveguide design on SOI (Silicon-on-insulator) platform, the mode profiles have been obtained up to 10 µm range of wavelength. The commercial Lumerical FDE mode solver has been used throughout the simulations of the waveguide design, exploring the spectral and geometric parametric sweep. We have discussed the optimised widths and heights with higher effective index of SOI rib waveguide for mid-IR wavelengths - 3.6 µm, 4.74 µm and 9.14 µm. The results of the modes of the rib waveguide for mid-IR range are discussed around the phononic absorption peak of SiO2 with the help of its dispersion curve. Our future interest is to fabricate waveguides for the above mentioned wavelengths and characterize using MIRcat 2400-QT, Daylight Solutions Inc. available in lab.

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