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人工晶体学报 ›› 2025, Vol. 54 ›› Issue (9): 1547-1557.DOI: 10.16553/j.cnki.issn1000-985x.2025.0078

• 研究论文 • 上一篇    下一篇

YPO4双折射率增益机制和晶格工程调控策略研究

韩懿博(), 吉旭(), 井群(), 朱宣恺, 艾孜再姆·吾布力塔依尔, 赵文豪, 曹鑫佳   

  1. 新疆大学物理科学与技术学院,乌鲁木齐 830017
  • 收稿日期:2025-04-14 出版日期:2025-09-20 发布日期:2025-09-23
  • 通信作者: 吉旭,井群
  • 作者简介:韩懿博(2004—),男,河南省人。E-mail:18736040762@163.com
  • 基金资助:
    国家级大学生创新训练计划项目(202310755096)

Birefringence Enhancement Mechanism and Lattice Engineering Controlling Strategy of YPO4

HAN Yibo(), JI Xu(), JING Qun(), ZHU Xuankai, AIZIZAIMU·WUBULITAYIER , ZHAO Wenhao, CAO Xinjia   

  1. School of Physics Science and Technology,Xinjiang University,Urumqi 830017,China
  • Received:2025-04-14 Online:2025-09-20 Published:2025-09-23
  • Contact: JI Xu, JING Qun

摘要: 稀土磷酸盐因具有较大的带隙和较好的光学特性,被认为是一种重要的紫外/深紫外光学材料。本文通过高通量筛选无机晶体结构数据库(ICSD),获得了磷酸钇(YPO4)晶体的两种相似结构Ⅰ(No.24514)、Ⅱ(No.133671)。运用第一性原理系统研究了Ⅰ和Ⅱ的电子结构和光学性质,利用计算机仿真研究了直接改变晶格常数来调控晶体YPO4带隙和双折射的可行性与可靠性。研究结果表明,晶格工程调控下晶体YPO4的双折射变化显著(在1 064 nm波长下,全维度压缩晶格至原来的70%,双折射改变高达0.052(Ⅰ)、0.057(Ⅱ);单轴(c轴)压缩晶格至70%,双折射改变达0.029(Ⅰ)、0.031(Ⅱ))。PO4和YO8基团均对晶体YPO4的双折射有突出贡献。P、O原子主导晶体YPO4双折射的走向,Y原子对双折射调控效率影响显著,在调控双折射的过程中发挥了非常关键的作用。晶格工程调控晶体双折射成效显著,此研究为新材料的设计研发和拓宽非线性光学材料应用场景提供新的思路。

关键词: 磷酸钇晶体; 密度泛函理论; 双折射; 晶格工程; 实空间原子切割; Born有效电荷

Abstract: Rare-earth phosphates are recognized as novel ultraviolet/deep-ultraviolet optical materials due to their wide bandgaps and excellent optical properties. In this work, two analogous structures (Ⅰ: ICSD No.24514 and Ⅱ: ICSD No.133671) of yttrium phosphate (YPO4) crystals were identified through high-throughput screening of the inorganic crystal structure database (ICSD). First-principles calculations were systematically employed to investigate the electronic structures and optical properties of these compounds. Computational simulations were conducted to verify the feasibility and reliability of regulating bandgap and birefringence in YPO4 crystals through direct lattice parameter manipulation. The results demonstrate remarkable birefringence modulation under lattice engineering: full-dimensional lattice compression to 70% of the original size induced birefringence changes of 0.052 (phase Ⅰ) and 0.057 (phase Ⅱ) at 1 064 nm wavelength, while uniaxial compression along the c-axis (70% strain) yielded 0.029 (phase Ⅰ) and 0.031 (phase Ⅱ). Both PO4 and YO8 groups were found to contribute significantly to the birefringence of YPO4. Atomic-level analysis reveals that P and O atoms predominantly determine the birefringence orientation, whereas Y atoms play a crucial role in modulating the birefringence efficiency through lattice distortion. This systematic investigation confirms the effectiveness of lattice engineering in birefringence regulation, providing novel insights for designing advanced optical materials and expanding application scenarios for nonlinear optical crystals.

Key words: YPO4 crystal; density functional theory; birefringence; lattice engineering; real-space atom cutting; Born effective charge

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