Ultrafast all-optical switching in nonlinear 3R-MoS$_2$ van der Waals metasurfaces
| Title: | Ultrafast all-optical switching in nonlinear 3R-MoS$_2$ van der Waals metasurfaces |
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| Authors: | Seidt, Levin, Weber, Thomas, Seredin, Albert A., Possmayer, Thomas, Savelev, Roman, Petrov, Mihail A., Maier, Stefan A., Tittl, Andreas, Menezes, Leonardo de S., Sortino, Luca |
| Publication Year: | 2025 |
| Collection: | Condensed Matter Physics (Other) |
| Subject Terms: | Physics - Optics, Condensed Matter - Mesoscale and Nanoscale Physics |
| More Details: | Second-order nonlinear optical processes are fundamental to photonics, spectroscopy, and information technologies, with material platforms playing a pivotal role in advancing these applications. Here, we demonstrate the exceptional nonlinear optical properties of the van der Waals crystal 3R-MoS$_2$, a rhombohedral polymorph exhibiting high second-order optical susceptibility ($\chi^{(2)}$) and remarkable second-harmonic generation (SHG) capabilities. By designing high quality factor resonances in 3R-MoS$_2$ metasurfaces supporting quasi-bound states in the continuum (qBIC), we first demonstrate SHG efficiency enhancement exceeding 10$^2$. Additionally, by using degenerate pump-probe spectroscopy, we harness the C$_{3v}$ system's symmetry to realize ultrafast SHG polarization switching with near-unity modulation depth. The operation speeds are limited only by the excitation pulse duration, allowing its characterization via the nonlinear autocorrelation function. These findings establish 3R-MoS$_2$ as a transformative platform for nanoscale nonlinear optics, offering large conversion efficiencies and ultrafast response times for advanced pulse measurement devices, integrated photonics, and quantum technologies. Comment: 4 figures main text, 18 pages |
| Document Type: | Working Paper |
| Access URL: | http://arxiv.org/abs/2503.19590 |
| Accession Number: | edsarx.2503.19590 |
| Database: | arXiv |
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