Recrystallization-Driven High-Performance Optical Nonlinearity Recovery of Layered van der Waals NbOCl2 DOI
Jianlong Kang, Li Zhou, Yiduo Wang

et al.

The Journal of Physical Chemistry Letters, Journal Year: 2025, Volume and Issue: unknown, P. 4262 - 4269

Published: April 22, 2025

van der Waals crystal NbOCl2 has attracted considerable interest owing to its spontaneous parametric downconversion properties, but challenges remain due degradation and reduced optical nonlinearity under ambient conditions. Here, we show that high-temperature vacuum annealing can recover even enhance second harmonic generation (SHG) in degraded via recrystallization. During degradation, the second-order decreases, accompanied by changes structure of NbOCl2. However, after annealing, SHG is recovered improved as a result recrystallization nanosheets. This strategy enables realization tunable nonlinear responses, including absorption. By combining linear absorption spectroscopy, transient absorption, transmission electron microscopy, occurs specific temperatures, leading bandgap modulation altered electronic relaxation. study offers new approach achieving reversible for device applications.

Language: Английский

Recrystallization-Driven High-Performance Optical Nonlinearity Recovery of Layered van der Waals NbOCl2 DOI
Jianlong Kang, Li Zhou, Yiduo Wang

et al.

The Journal of Physical Chemistry Letters, Journal Year: 2025, Volume and Issue: unknown, P. 4262 - 4269

Published: April 22, 2025

van der Waals crystal NbOCl2 has attracted considerable interest owing to its spontaneous parametric downconversion properties, but challenges remain due degradation and reduced optical nonlinearity under ambient conditions. Here, we show that high-temperature vacuum annealing can recover even enhance second harmonic generation (SHG) in degraded via recrystallization. During degradation, the second-order decreases, accompanied by changes structure of NbOCl2. However, after annealing, SHG is recovered improved as a result recrystallization nanosheets. This strategy enables realization tunable nonlinear responses, including absorption. By combining linear absorption spectroscopy, transient absorption, transmission electron microscopy, occurs specific temperatures, leading bandgap modulation altered electronic relaxation. study offers new approach achieving reversible for device applications.

Language: Английский

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