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Analytical model for transmission dips in self-assembled two-dimensional colloidal crystals

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Abstract

Self-assembled two-dimensional (2D) colloidal crystals (CCs) are utilized in various optical devices, lasers, biosensors, and light harvesting applications. Optical design tuning capabilities, in terms of sphere refractive index and diameter size, can influence the optical characteristics for the close-packed single-layer or multilayer structures. Often transmission dips in 2D CCs are observed, which cannot be explained by Bragg diffraction as it does for 3D photonic crystals. In this work, an analytical attempt to accurately model the transmission dips observed in the 2D CCs optical spectra is presented, aiming to explain the origin of these dips. The formation of a broad dip was studied experimentally as well. A less than 1% mismatching error was found between experiment and theory for the two blaze peak positions as well as for the transmission intensity ratio. Finally, the 2D CCs were integrated in mesostructured solar cells as light trapping structures.

© 2021 Optical Society of America

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Data Availability

Data underlying the results presented in this paper are available in Ref. [34].

34. S. O. Abdellatif, K. Kirah, and F. Marlow, “Analytical model for transmission dips in 2D CCs,” MATLAB Central File Exchange, 2021, https://www.mathworks.com/matlabcentral/fileexchange/100049-2d-ccs-model.

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Equations (14)

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