Design and modelling of dispersion-engineered rib waveguide for ultra broadband mid-infrared supercontinuum generation. Issue 2 (19th January 2017)

• Record Type: Journal Article
• Authors: Saini, Than Singh; Kumar, Ajeet; Sinha, Ravindra Kumar
• Is Part Of: Journal of modern optics. Volume 64:Issue 2(2017)
• Page Start: 143
• Page End: 149
• Publication Date: 2017-01-19
• Subjects: Non-linear optics -- highly non-linear rib waveguide -- mid-infrared supercontinuum generation; Optics -- Periodicals; 535
• DOI: 10.1080/09500340.2016.1216190
• Languages: English
• ISSNs: 0950-0340

Abstract

Abstract: We report a dispersion-engineered As2 Se3 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 As2 Se3 -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.