Modeling of dispersion engineered chalcogenide rib waveguide for ultraflat mid-infrared supercontinuum generation in all-normal dispersion regime

Ahmad, Harith and Karim, Mohammad Rezaul and Rahman, B.M. Azizur (2018) Modeling of dispersion engineered chalcogenide rib waveguide for ultraflat mid-infrared supercontinuum generation in all-normal dispersion regime. Applied Physics B, 124 (3). p. 47. ISSN 0946-2171, DOI

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A rigorous numerical investigation has been carried out through dispersion engineering of chalcogenide rib waveguide for near-infrared to mid-infrared ultraflat broadband supercontinuum generation in all-normal group-velocity dispersion regime. We propose a novel design of a 1-cm-long air-clad rib waveguide which is made from Ge 11.5 As 24 Se 64.5 chalcogenide glass as the core with either silica or Ge 11.5 As 24 S 64.5 chalcogenide glass as a lower cladding separately. A broadband ultraflat supercontinuum spanning from 1300 to 1900 nm could be generated when pumped at 1.55 μ m with a low input peak power of 100 W. Shifting the pump to 2 μ m , the supercontinuum spectra extended in the mid-infrared region up to 3400 nm with a moderate-input peak power of 500 W. To achieve further extension in mid-infrared, we excite our optimized rib waveguide in both the anomalous and all-normal dispersion pumping regions at 3.1 μ m with a largest input peak power of 3 kW. In the case of anomalous dispersion region pumping, numerical analysis shows that supercontinuum spectrum can be extended in the mid-infrared up to 10 μ m , although this contains high spectral amplitude fluctuations over the entire bandwidth which limits the supercontinuum sources in the field of high precision measurement applications. On the other hand, by optimizing a rib waveguide geometry for pumping in all-normal dispersion region, we are able to generate a smooth and flat-top coherent supercontinuum spectrum with a moderate bandwidth spanning the wavelength range 2–5.5 μ m with less than 5 dB spectral fluctuation over the entire output bandwidth. Our proposed design is highly suitable for making on-chip SC light sources for a variety of applications such as biomedical imaging, and environmental and industrial sensing in the mid-infrared region.

Item Type: Article
Funders: Ministry of Higher Education (MOHE) under the Grants GA010-2014 (ULUNG), University of Malaya under the Grants RP029A-15 AFR, RP029B-15 AFR and RU001-2017
Uncontrolled Keywords: All normal dispersions; Chalcogenide rib waveguides; Dispersion engineering; High-precision measurement; Mid-infrared supercontinuum; Numerical investigations; Supercontinuum sources; Supercontinuum spectra
Subjects: Q Science > Q Science (General)
Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Deputy Vice Chancellor (Research & Innovation) Office > Photonics Research Centre
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 07 Oct 2019 01:06
Last Modified: 07 Oct 2019 01:06

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