Abstract

We compare numerically the supercontinuum generation (SCG) phenomenon in the Mid-Infrared (MIR) region through AsSe₂/As₂S₅ chalcogenide based optical waveguides namely photonic crystal fiber (PCF) and rib-like structures. The same material combination is used in the two configurations for MIRSCG. Specifically, the studied PCF is composed of a core made of AsSe₂ glass and a surrounding cladding made of As₂S₅ glass while the AsSe₂/As₂S₅ chalcogenide rib waveguide (AsSe₂/As₂S₅-ChRW) is filled in its upper cladding by air while the lower one is constituted by the As₂S₅ glass. The comparison is conducted in the anomalous dispersion regime on a very short 1 mm-length of propagation for a 50 fs sechtype pulse in the HE₁₁ mode at 4 μm wavelength for each waveguide. Despite the ultra-broadband and coherent MIR-SCG spectrum of 18.75 μm in bandwidth obtained with the considered AsSe₂/As₂S₅-PCF, we found that an AsSe₂/As₂S₅-ChRW that has a height H = 1.98 μm and a width W = 5 μm allows a SCG spanning approximately from 1 beyond 20 μm with a very low energy as 0.4 nJ.

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