City Research Online

Abstract

A promising design of Ge11.5As24Se64.5 nanowires for supercontinuum generation is proposed through numerical simulations. It can be used for generating a supercontinuum with 1300-nm bandwidth. The dispersion parameters upto eighth-order are obtained by calculating the effective mode index with the finite-element method. We have investigated dispersion curves for a number of nanowire geometries. Through dispersion engineering and by varying dimensions of the nanowires we have identified a promising structure that shows possibility of realizing a wideband supercontinuum. We have found significant variations in its bandwidth with the inclusion of higher-order dispersion coefficients and indicated the possibility of obtaining spurious results if the adequate number of dispersion coefficients is not considered. To confirm the accuracy of dispersion coefficients obtained through numerical computations, we have shown that a data-fitting procedure based on the Taylor series expansion provides good agreement with the actual group velocity dispersion curve obtained by using a full-vectorial finite-element mode-solver.

Publication Type:	Article
Additional Information:	© 2014 Optical Society of America. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited. Doi: http://dx.doi.org/10.1364/OE.22.031029. M. R. Karim, B. M. A. Rahman, and G. P. Agrawal, "Dispersion engineered Ge11.5As24Se64.5 nanowire for supercontinuum generation: A parametric study," Opt. Express 22, 31029-31040 (2014)
Publisher Keywords:	Numerical approximation and analysis; Nonlinear optics, integrated optics; Dispersion; Supercontinuum generation; Glass waveguides.
Subjects:	Q Science > QC Physics T Technology > TK Electrical engineering. Electronics Nuclear engineering
Departments:	School of Science & Technology > Engineering
SWORD Depositor:	Symplectic Administrator

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