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Comparison of enhanced second harmonic generation in pyramid-like in-plane MoS2 flakes to vertically aligned MoS2 flakes.
- Source :
- Journal of Applied Physics; 2/14/2021, Vol. 129 Issue 6, p1-7, 7p
- Publication Year :
- 2021
-
Abstract
- Here, we report the comparative study of enhanced second harmonic generation using defect engineering in pyramid-like MoS<subscript>2</subscript> (P-MoS<subscript>2</subscript>) flakes to vertically aligned MoS<subscript>2</subscript> (VA-MoS<subscript>2</subscript>) flakes. P-MoS<subscript>2</subscript> and VA-MoS<subscript>2</subscript> is synthesized via the modified chemical vapor deposition technique. The second harmonic generation measurements on P-MoS<subscript>2</subscript> and VA-MoS<subscript>2</subscript> are performed by sweeping the excitation wavelength from 1200 nm to 1310 nm in identical conditions. The P-MoS<subscript>2</subscript> flakes show a high SHG signal. The high SHG signal in pyramid-like MoS<subscript>2</subscript> is attributed to the broken inversion symmetry and high thickness of grown MoS<subscript>2</subscript> flakes. VA-MoS<subscript>2</subscript> flakes under the identical conditions show a 34% enhanced SHG signal in comparison to P-MoS<subscript>2</subscript>. The midgap states generated due to defects in the form of S vacancies in VA-MoS<subscript>2</subscript> are responsible for this enhancement. These midgap states confine the photons and result in enhanced SHG properties. Our study will pave a new path to understand the role of 2D material morphology in fabricating versatile optical and photonics devices. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00218979
- Volume :
- 129
- Issue :
- 6
- Database :
- Complementary Index
- Journal :
- Journal of Applied Physics
- Publication Type :
- Academic Journal
- Accession number :
- 148717467
- Full Text :
- https://doi.org/10.1063/5.0035738