Abstract
Two-dimensional transition metal dichalcogenides materials play a pivotal role in photonics. Their placement in photonic crystals was proved effective in enhancing the absorption for a wide range of applications. In this paper, we study the symmetric and asymmetric defective photonic crystals (DPC) whose defects are formed by DMD where M indicates the WS2 or WSe2 monolayer and D represents SiO2 layer. The present study investigates the effects of the position of the defect layer in DPC on the absorption, FWHM, quality factor, number, and wavelength of the defect modes in both symmetric and asymmetric structures. We show that the amount of the absorption of defect modes in the case of WSe2 and WS2 is above 93% and 80% in symmetric and asymmetric structures, respectively. Further, in symmetric structures, FWHM of WS2 is broader than that of WSe2; in asymmetric structures, on the other hand, FWHM of WSe2 is wider than that of WS2. Also, Photonic band gap does not depend on the thickness of the defect layer, the symmetry or asymmetry of the structure, periodicity of the top and bottom defect layer of DMD. The proposed structures are likely to attract the attentions to their applications in photoelectric detectors, absorbent filters, solar cells, and the like.
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Ansari, N., Mohebbi, E. & Nazari, E. The role of the defect in photonic crystals based on WS2 or WSe2 monolayers: a vision on how to achieve high quality factor and wavelength adjustability in defect modes. Opt Quant Electron 55, 319 (2023). https://doi.org/10.1007/s11082-022-04282-7
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DOI: https://doi.org/10.1007/s11082-022-04282-7