Abstract
Dispersion engineering of photonic crystal waveguides is attractive due to their potential applications in linear and nonlinear phenomena. Here, we present a comprehensive and systematic study to achieve the increased control over the dispersion curve of the waveguide, operating at telecom wavelengths. The effect of the radius of air cylinders, and their lattice position on the dispersion features is studied chiefly in a line-defect photonic crystal waveguide. For this purpose, perturbations were introduced in the radius and position of the air cylinders. With the help of MIT Photonic Bands software, group index and dispersion coefficients were calculated to characterize the features of the waveguide. Ring like structures were introduced in the innermost rows to increase the impact to further level. With this systematic study, one can tune the waveguide with desired range of group index and bandwidth with controlled dispersion properties. Present study resulted with a constant group index in the range of 31.42 to 7.64 over a bandwidth of 7.97 nm to 30.41 nm with very low dispersion. The developed structures may find applications in optical delays, optical buffers and nonlinear applications.
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Acknowledgements
Authors sincerely thank Department of Science and Technology, Government of India for funding this work through INSPIRE fellowship program (IF160435).
Funding
This work is funded by Department of Science and Technology, Government of India (DST-GoI) under the INSPIRE fellowship with fellowship number IF160435. Authors sincerely thank DST-GoI for the same.
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VDRP has performed the simulations, collected the raw data, did the primary analysis and prepared the manuscript. SR has analyzed the results, drawn the conclusions and finalized the contents of the manuscript.
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Pavan, V.D.R., Roy, S. Analyzing dispersion properties of photonic crystal waveguides with hole and ring like lattice by introducing systematic shift and twist. Opt Quant Electron 53, 711 (2021). https://doi.org/10.1007/s11082-021-03333-9
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DOI: https://doi.org/10.1007/s11082-021-03333-9