Giant enhancement of second harmonic generation efficiency from MoS2 mono layers embedded in 1D photonic crystals

. In this paper an enhancement of second harmonic generation efficiency which radiated from MoS 2 monolayers embedded in one-dimensional photonic crystal structures is studied. The system contains air, SiO 2 and MoS 2 layers in periodic manner with the same thickness of air and SiO 2 layers. The tra...

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Bibliographic Details
Published in:European physical journal plus 2018-08, Vol.133 (8), p.338, Article 338
Main Authors: Khani, M., Khazaei Nezhad, M., Rastegar Moghaddam Rezaeiun, H.
Format: Article
Language:English
Subjects:
Applied and Technical Physics
Atomic
Chemical vapor deposition
Complex Systems
Condensed Matter Physics
Crystal structure
Crystals
Efficiency
Electric fields
Mathematical and Computational Physics
Matrix methods
Molecular
Molybdenum
Molybdenum disulfide
Monolayers
Optical and Plasma Physics
Phase matching
Photonic band gaps
Photonic crystals
Physics
Physics and Astronomy
Regular Article
Second harmonic generation
Silicon dioxide
Symmetry
Theoretical
Thickness
Transfer matrices
Wavelengths
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Summary:. In this paper an enhancement of second harmonic generation efficiency which radiated from MoS 2 monolayers embedded in one-dimensional photonic crystal structures is studied. The system contains air, SiO 2 and MoS 2 layers in periodic manner with the same thickness of air and SiO 2 layers. The transfer matrix method is used for calculating the forward and backward second harmonic generated wave efficiencies in undepleted pump approximation. Our results show the giant enhancement of second harmonic generation efficiencies up to seven orders of magnitude only with N = 40 MoS 2 monolayers in the system. The results are obtained by tunning the thickness of air and SiO 2 layers at about 1284 nm for fundamental wave of λ = 810 nm wavelength. Choosing the above thickness causes the second harmonic waves, generated in each MoS 2 monolayers, to interference constructively. Both of the fundamental and second harmonic wavelengths are located at the photonic band gap edges where the density of electromagnetic modes and the nonlinear interaction time are enhanced. These two mechanisms help us to improve the second harmonic generation efficiencies. Increasing the segments numbers enhanced the overall thickness of MoS 2 nonlinear layers which affect the phase matching conditions and decreased the SH efficiencies.
ISSN:2190-5444
2190-5444
DOI:10.1140/epjp/i2018-12154-3