Design and modelling of dispersion-engineered rib waveguide for ultra broadband mid-infrared supercontinuum generation |
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Authors: | Than Singh Saini Ravindra Kumar Sinha |
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Affiliation: | 1. Advanced Photonics Simulation Research Laboratory, Department of Applied Physics, Delhi Technological University (Formerly Delhi College of Engineering), Delhi, India;2. CSIR-Central Scientific Instruments Organization, Chandigarh, India |
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Abstract: | We report a dispersion-engineered As2Se3 chalcogenide glass rib waveguide structure for ultra broadband mid-infrared supercontinuum generation across molecular ‘fingerprint region’. The proposed rib waveguide structure offers non-linear coefficient as high as 18,250 W?1 km?1 at 2.5 μm. Supercontinuum spectrum spanning 2–15 μm, which not only covers the both atmospheric transparent windows (3–5 μm and 8–13 μm) in the mid-infrared domain but also covers the important molecular ‘fingerprint domain’, is obtained using only 4 mm-long rib waveguide structure. To the best of our knowledge, such broadband mid-infrared supercontinuum spectrum in As2Se3-based chalcogenide waveguide geometry is reported for the first time. The proposed design of rib waveguide has potential for robust, integrated and low-cost supercontinuum sources in various applications including frequency comb generation, chemical sensing, food quality control and early cancer diagnostics. |
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Keywords: | Non-linear optics highly non-linear rib waveguide mid-infrared supercontinuum generation |
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