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Copper Functionalized SnSe Nanoflakes Enabling Nonlinear Optical Features for Ultrafast Photonics
Ke Ren1, Hualei Yuan2, Zhongben Pan1
1School of Information Science and Engineering, and Key Laboratory of Laser and Infrared System of Ministry of Education, Shandong University, Qingdao, 266237, China.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|July 24, 2024
Summary
Copper functionalization of tin selenide (SnSe) nanoflakes improves their conductivity and near-infrared absorption for ultrafast photonics. This enhancement leads to superior nonlinear optical properties and shorter laser pulse durations.
Area of Science:
- Materials Science
- Optoelectronics
- Nanotechnology
Background:
- Tin selenide (SnSe) nanoflakes show promise for ultrafast photonics but suffer from low conductivity and weak near-infrared (NIR) absorption.
- Functionalization is key to overcoming these limitations and enhancing material properties.
Purpose of the Study:
- To enhance the ultrafast photonics applications of SnSe nanoflakes through copper (Cu) functionalization.
- To investigate the effects of Cu functionalization on SnSe's conductivity, NIR absorption, and nonlinear optical properties.
Main Methods:
- Density functional theory (DFT) calculations.
- Experimental analyses including Z-scan measurements and femtosecond transient absorption spectroscopy.
- Integration of functionalized SnSe into an erbium-doped fiber laser.
Main Results:
- Cu functionalization enhances SnSe concentration, induces strain, and reduces the bandgap via Sn substitution and Cu ion filling of Sn vacancies.
- Cu-functionalized SnSe exhibits improved NIR optical absorption and superior third-order nonlinear optical properties compared to pristine SnSe.
- Integration into a fiber laser resulted in shorter pulse durations (798 fs), broader spectral bandwidth (3.44 nm), and stable harmonic mode-locking of bound-state solitons.
Conclusions:
- Cu functionalization significantly enhances the nonlinear optical properties and ultrafast photonics performance of SnSe nanoflakes.
- This approach offers a new strategy for improving wide bandgap 2D materials for advanced photonic applications.
- Cu-functionalized SnSe demonstrates considerable potential for use in ultrafast laser systems.
