Optical Amplification in Hollow-Core Negative-Curvature Fibers Doped with Perovskite CsPbBr₃ Nanocrystals

• Main Authors: Juan Navarro-Arenas, Isaac Suárez, Juan P. Martínez-Pastor, Albert Ferrando, Andrés F. Gualdrón-Reyes, Iván Mora-Seró, Shou-Fei Gao, Ying-Ying Wang, Pu Wang, Zhipei Sun
• Format: Article
• Language: English
• Published: MDPI AG 2019-06-01
• Series: Nanomaterials
• Subjects: hollow core fibers; perovskite nanocrystals; signal regeneration/amplification; nonlinear optical properties
• Online Access: https://www.mdpi.com/2079-4991/9/6/868
• ISSN: 2079-4991

We report a hollow-core negative-curvature fiber (HC-NCF) optical signal amplifier fabricated by the filling of the air microchannels of the fiber with all-inorganic CsPbBr₃ perovskite nanocrystals (PNCs). The optimum fabrication conditions were found to enhance the optical gain, up to +3 dB in the best device. Experimental results were approximately reproduced by a gain assisted mechanism based on the nonlinear optical properties of the PNCs, indicating that signal regeneration can be achieved under low pump powers, much below the threshold of stimulated emission. The results can pave the road for new functionalities of the HC-NCF with PNCs, such as optical amplification, nonlinear frequency conversion and gas sensors.