Reyihanguli Tudi, Shuhan Li, Minjie Zhou, Zhongxin Zhang, Bumaliya Abulimiti* and Mei Xiang*,
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All-Optical Broadband Terahertz Modulator Based on CsPbX3(X = Cl, Br) Perovskite Quantum Dots Heterostructure
All-optical THz heterojunction modulators have gained significant attention to meet the demanding requirements of next-generation wireless communication technologies. Self-powered heterojunction photodetectors have high separation and utilization of photoinduced charge carriers even without external power sources. This high efficiency separation is attributed to the built-in electric field between heterojunction layers, a crucial factor for all-optical THz heterojunction modulators. However, CsPbX3/Si heterojunctions exhibit excellent optical and electrical properties, positioning them as promising candidates for high-performance all-optical terahertz (THz) modulators. Here, the perovskite quantum dots CsPbCl3/Si and CsPbBr3/Si are studied to achieve broadband modulation (0.3–1.6THz) at low laser power based on all-optically controlled terahertz modulators, with modulation depths of 81% and 70%, respectively, and the bare silicon exceeds this by 8 times. The results suggest that self-powered photodetectors could serve as a promising source for high-performance terahertz modulators. Additionally, THz-TDS emerges as a sensitive and noncontact technique for evaluating the performance of photodetectors.
期刊介绍：
ACS Applied Optical Materials is an international and interdisciplinary forum to publish original experimental and theoretical including simulation and modeling research in optical materials complementing the ACS Applied Materials portfolio. With a focus on innovative applications ACS Applied Optical Materials also complements and expands the scope of existing ACS publications that focus on fundamental aspects of the interaction between light and matter in materials science including ACS Photonics Macromolecules Journal of Physical Chemistry C ACS Nano and Nano Letters.The scope of ACS Applied Optical Materials includes high quality research of an applied nature that integrates knowledge in materials science chemistry physics optical science and engineering.
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