Enhanced Nonlinear Optical Responses in MoS2 via Femtosecond Laser-Induced Defect-Engineering
No Thumbnail Available
Access rights
openAccess
publishedVersion
URL
Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
This publication is imported from Aalto University research portal.
View publication in the Research portal (opens in new window)
View/Open full text file from the Research portal (opens in new window)
Other link related to publication (opens in new window)
View publication in the Research portal (opens in new window)
View/Open full text file from the Research portal (opens in new window)
Other link related to publication (opens in new window)
Date
2024-11-12
Major/Subject
Mcode
Degree programme
Language
en
Pages
11
Series
Advanced Functional Materials, Volume 34, issue 46
Abstract
2D materials are a promising platform for applications in many fields as they possess a plethora of useful properties that can be further optimized by careful engineering, for example, by defect introduction. While reliable high-yield defect engineering methods are in demand, most current technologies are expensive, harsh, or non-deterministic. Optical modification methods offer a cost-effective and fast mechanism to engineer the properties of 2D materials at any step of the device fabrication process. In this paper, the nonlinear optical responses of mono-, bi-, and trilayer molybdenum disulfide (MoS2) flakes are enhanced by deterministic defect-engineering with a femtosecond laser. A 50-fold enhancement in the third harmonic generation (THG) and a 3.3-fold increase in the second harmonic generation (SHG) in the optically modified areas is observed. The enhancement is attributed to resonant SHG and THG processes arising from optically introduced mid-band gap defect states. These results demonstrate a highly controllable, sub-micrometer resolution tool for enhancing the nonlinear optical responses in 2D materials, paving the way for prospective future applications in optoelectronics, quantum technologies, and energy solutions.Description
| openaire: EC/H2020/872049/EU//IPN-Bio | openaire: EC/H2020/834742/EU//ATOP openaire: EC/HE/101082183/EU//A-Laser
Keywords
Defect engineering, Nonlinear Optics, femtosecond laser, optical modification, second harmonic generation, transition metal dichalcogenides, nonlinear optics, defect engineering
Other note
Citation
Akkanen, S-T, Arias Muñoz, J C, Emelianov, A V, Mentel, K K, Tammela, J, Partanen, M, Das, S, Pettersson, M & Sun, Z 2024, ' Enhanced Nonlinear Optical Responses in MoS2 via Femtosecond Laser-Induced Defect-Engineering ', Advanced Functional Materials, vol. 34, no. 46, 2406942 . https://doi.org/10.1002/adfm.202406942