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Terahertz modulator a using CsPbBr3 perovskite quantum dots heterostructure

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Abstract

A novel terahertz wave modulator based on CsPbBr3 perovskite quantum dots heterostructure is proposed. An external modulated 450 nm pumping laser is utilized to generate photoexcited free carriers at the CsPbBr3 perovskite quantum dots heterostructure medium. We measured an amplitude modulation of the terahertz transmission in the frequency range from 0.23 to 0.35 THz with various laser intensity irradiances. In addition, dynamic amplitude modulation at 0.27 THz carrier wave show that the modulator provides a modulation speed of 2.5 MHz at a external pump laser irradiance of 2.0 W/cm2. Our CsPbBr3 perovskite quantum dots heterostructure can high speed modulation and can be used for terahertz modulation in addition to photovoltaics application.

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Acknowledgements

The authors gratefully acknowledge the financial support from National Natural Science Foundation of China (Grant nos. 61871355, 61831012).

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  1. Centre for THz Research, China Jiliang University, Hangzhou, 310018, China

    Li Shao-he & Li Jiu-sheng

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  1. Li Shao-he
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Shao-he, L., Jiu-sheng, L. Terahertz modulator a using CsPbBr3 perovskite quantum dots heterostructure. Appl. Phys. B 124, 224 (2018). https://doi.org/10.1007/s00340-018-7094-7

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