薄膜铌酸锂光电探测器近期研究进展

摘要/Abstract

摘要： 铌酸锂晶体具有高电光、压电和非线性光学系数,宽光学透明范围、兼容速度匹配、相位匹配和色散工程,长期稳定性以及可低成本制备光学级晶圆等众多优势,作为构筑如电光调制器、光学频率梳、光波导等光电子器件的重要平台,在信息通信领域的光产生、光传输、光调制等领域大放异彩,被誉为“光子领域的硅”,具有巨大的集成应用潜力,受到学术界和产业界的广泛关注。然而,由于铌酸锂的绝缘体和弱光学吸收特性,基于铌酸锂平台的集成应用领域还面临光电转换效率低和探测难的问题,全光通信中光解调和光提取需要高性能探测器的支撑,因此研发基于铌酸锂的光电探测器具有重大的科学意义和应用价值。本文从铌酸锂的基本结构特性出发,详细介绍了铌酸锂的优异物性和光电转化机理,综述了国内外学者近期的一些研究成果,重点阐述了基于铌酸锂晶体的光波导集成型光电探测器和异质结型光电探测器的研究进展,探讨并比较了不同路线的优点和发展潜力,并对该领域提出展望。

关键词: 铌酸锂, 光电探测器, 光芯片, 光波导, 热释电

Abstract: Lithium niobate crystal has many advantages such as large electro-optical, piezoelectric and non-linear optical coefficients, wide optical transparency range, compatibility with speed matching, phase matching and dispersion engineering, long-term stability and low-cost preparation of optical-grade wafers. As an important platform for constructing optoelectronic devices such as electro-optic modulators, optical frequency combs and optical waveguides, lithium niobate holds grant promise in the fields of light generation, light transmission and light modulation in the field of information and communication. Lithium niobate is also well known as the “silicon of photonics” and has huge integration potential in both academia and industry. However, due to the insulator and weak optical absorption properties of lithium niobate, integrated application fields based on lithium niobate platforms also face the problems of low photo-to-electric conversion efficiency and thus arouse difficult in photodetection. Light demodulation and light extraction in all-optical communications require high-performance detectors, therefore, the development of photodetectors based on lithium niobate has great scientific significance and application value. Starting from the basic structural characteristics of lithium niobate, this article introduces in detail the excellent physical properties and photo-to-electric conversion mechanism of lithium niobate, reviews some recent research results of domestic and foreign scholars, and focuses on the optical waveguide integrated photodetectors and the heterogeneous type photodetectors based on lithium niobate crystals, the advantages and development potential of different routes are discussed and compared, and prospects for this field are proposed.

Key words: lithium niobate, photodetector, photonic chip, optical waveguide, pyroelectric

中图分类号:

TB34
O469

谢汉荣, 杨铁锋, 韦玉明, 关贺元, 卢惠辉. 薄膜铌酸锂光电探测器近期研究进展[J]. 人工晶体学报, 2024, 53(3): 410-425.

XIE Hanrong, YANG Tiefeng, WEI Yuming, GUAN Heyuan, LU Huihui. Recent Research Progress of Thin film Lithium Niobate Photodetector[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2024, 53(3): 410-425.

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