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Recent progress in terahertz modulation using photonic structures based on two-dimensional materials

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InfoMat 2021年第10期3卷 1110-1133页

作者： Ziming Wang Jie Qiao Shuqi Zhao Shilei Wang Chuan He xutang tao Shanpeng Wang State Key Laboratory of Crystal Materials Institute of Crystal MaterialsShandong UniversityJinanChina School of Materials Science&Engineering Beijing Institute of TechnologyBeijingChina

Terahertz(THz)technology has attracted great attention in the past few decades for its unique applications in various fields,including spectroscopy,noninvasive detection,wireless communications,and *** parallel to this,the practical,fast,and broadband modulation of THz waves is becoming ***-dimensional(2D)materials exhibit unusual optical and electrical properties,which has prompted tremendous interest and significant advances in THz *** review provides the recent progress in 2D materials-based THz modulators,outlining the operating principles,including all-optical,electro-optic,magneto-optic,and other exotic *** focus on the recent advances in THz modulation by the designed photonic structures,such as heterostructure,metamaterial,capacitor,optical cavity,and waveguide ***,we discussed the challenges and opportunities for 2D materials-based THz modulators and presented our prospects for the future development.

关键词： 2D material optoelectronic device photonic structure terahertz modulation

Investigation on the key factors in the hydrothermal synthesis of BN: The way of introducing sodium azide

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Chinese Science Bulletin 2007年第13期52卷 1785-1790页

作者： LI Kai JIANG HaiHui LIAN Gang WANG QiLong ZHAO Xian CUI DeLiang tao xutang State Key Laboratory of Crystal Materials Shandong University Jinan 250100 China School of Chemistry & Chemical Engineering Shandong University Jinan 250100 China Shandong Institute of Light Industry Jinan 250100 China

The way of introducing sodium azide (NaN_3) into the reaction solution played an important role in the preparation of cBN by hydrothermal synthesis method. The results showed that both cBN content and crystalline perfection of the samples improved with increasing R_N value, and pure cBN could be obtained at 300℃ and 10 MPa when R_N increased to 3:1. Here R_N is defined as R_N =NaN_3(I)/NaN_3(II), wherNaN_3(I) denotes the amount of NaN_3 (in molar) that is added into the autoclave at the beginning of threaction process, and NaN_3(II) is the amount of NaN_3 (also in molar) introduced into the autoclave ahigh temperature and high pressure (i.e. 300℃ and 10 MPa). In order to explain the experimental results, a preliminary model was proposed in this paper.

关键词：水热合成叠氮化钠化学实验研究

A review of β-Ga_2O_3 single crystal defects, their effects on device performance and their formation mechanism

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Journal of Semiconductors 2019年第1期40卷 45-55页

作者： Bo Fu Zhitai Jia Wenxiang Mu Yanru Yin Jian Zhang xutang tao State Key Laboratory of Crystal Materials & Key Laboratory of Functional Crystal Materials and Device Shandong University

As a wide-bandgap semiconductor(WBG), β-Ga_2O_3 is expected to be applied to power electronics and solar blind UV photodetectors. In this review, defects in β-Ga_2O_3 single crystals were summarized, including dislocations, voids, twin, and small defects. Their effects on device performance were discussed. Dislocations and their surrounding regions can act as paths for the leakage current of SBD in single crystals. However, not all voids lead to leakage current. There's no strong evidence yet to show small defects affect the electrical properties. Doping impurity was definitely irrelated to the leakage current. Finally, the formation mechanism of the defects was analyzed. Most small defects were induced by mechanical damages. The screw dislocation originated from a subgrain boundary. The edge dislocation lying on a plane slightly tilted towards the(102) plane, the(101) being the possible slip plane. The voids defects like hollow nanopipes, PNPs, NSGs and line-shaped grooves may be caused by the condensation of excess oxygen vacancies, penetration of tiny bubbles or local meltback. The nucleation of twin lamellae occurred at the initial stage of "shoulder part" during the crystal growth. These results are helpful in controlling the occurrence of crystal defects and improving the device performance.

关键词： β-Ga2O3 crystal defects device performance formation mechanism

Bulk gallium oxide single crystal growth

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Journal of Semiconductors 2019年第1期40卷 3-4页

作者： xutang tao State Key Laboratory of Crystal Materials & Key Laboratory of Functional Crystal Materials and Device Shandong University

Gallium oxide, as a new type of ultra-wide bandgap semiconductor, is expected to be used in power electronics and solar blind UV photodetectors. The main cause of research and development onβ-Ga2O3 is inspired by its larger bandgap, higher breakdown field, bigger Baliga figure-of-merit (FOM), shorter absorption edge and lower cost compared to the third-generation semiconductors, such as SiC and GaN.

关键词： Gallium oxide ultra-wide bandgap semiconductor crystal growth

The effect of metal electron cloud on the luminescence characteristics of organic ligands:An experimental and theoretical investigation

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Chinese Science Bulletin 2011年第6期56卷 479-483页

作者： ZHANG FuJun LIU XiaoJun HUANG Feng ZHUO ZuLiang LU LiFang XU Zheng WANG YongSheng tao xutang BIAN WenSheng TANG WeiHua Key Laboratory of Luminescence and Optical Information (Beijing Jiaotong University) Ministry of Education Beijing 100044 China State Key Laboratory of Crystal Materials Shandong University Jinan 250100 China Beijing National Laboratory for Molecular Sciences Beijing 100109 China Key Laboratory for Soft Chemistry and Functional Materials of Ministry Education Nanjing University of Science and Technology Nanjing 210094 China

The luminescence processes of metal complexes are complicated by intramolecular charge (energy) transfer from the metal to the ligand or from the ligand to the metal. The charge transfer strongly influences the excited state of the ligand and its luminescence characteristics. The luminescence characteristics of tris(8-hydroxyquinoline) aluminum (Alq3) and tris(8-hydroxyquinoline) gallium (Gaq3) are investigated to reveal the effect of the metal ion on the ligand. Emission from the complexes shows a significant red shift as the size of the metal ion increases from Al to Ga because of more efficient charge transfer from the metal to the ligand. Theoretical calculations on the structure and transition characteristics of the excited states of Alq3 and Gaq3 were performed. The calculated emission wavelength agrees with the experimental value and the effect of the metal electron cloud on the emission wavelength is clarified.

关键词：金属配合物有机配体发光特性电子云实验值金属离子效应电荷转移羟基喹啉

The interchange between hybrid Mn(Ⅱ) chloride perovskite single crystals

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The interchange between hybrid Mn(Ⅱ) chloride perovskite si...

High laser damage threshold LiNa_(5)Mo_(9)O_(30) prism:for visible to mid-infrared range

第三届新型太阳能电池学术研讨会

作者： Dianxing Ju Yangyang Dang xutang tao State Key Laboratory of Crystal Materials Shandong University Key Laboratory of Functional Crystal Materials and Device (Shandong University Ministry of Education)

Organic-inorganic hybrid single crystals demonstrate special challenges and opportunities with respect to potential applications in many optoelectronic fields,as well as for the observation of interesting physical ***,two kinds of hybrid Mn(Ⅱ) chloride perovskite single crystals were grown by slow evaporation method from different aqueous and hydrochloric acid solution with stoichiometric mixture of N(CH)Cl and MnCl·4HO at room *** crystal structures exhibit the orthorhombic(CH)NMnCl with space group Pnma and hexagonal(CH)NMnCl with space group P63/m by X-ray single-crystal diffraction analysis,respectively,as is shown in Figure ***,(CH)NMnCl and(CH)NMnCl are reversible via different condition in ambient ***,both single-crystals display intense green and red luminescence with quantum yield of 86.11% and 87.59% under UV wavelength excitation,which is ascribed to the different coordination environment of Mn.

关键词： hybrid Mn(Ⅱ) chloride perovskite single crystal quantum yield

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Chinese Optics Letters 2022年第5期20卷 29-32页

作者： Xiaoli Du Zeliang Gao Lijuan Chen Youxuan Sun xutang tao State Key Laboratory of Crystal Materials Shandong UniversityJinan 250100China School of Physics Science University of JinanJinan 250022China

In this study,an excellent polarization optical crystal LiNa_(5)Mo_(9)O_(30) with wide transmission range and high laser damage threshold was researched in *** laser damage threshold of the LiNa_(5)Mo_(9)O_(30) crystal was measured to be 2.64GW/cm^(2),which was the highest among polarized optical *** birefringence in the range of 0.435-5μm was larger than 0.14,while the wedge angle between 31.94°and 32.12°would satisfy the application in this *** extinction ratio of the fabricated prism with the wedge angel of 31.09°was larger than 15,000:*** results show that the LiNa_(5)Mo_(9)O_(30) prism is an excellent polarization device,especially in the mid-infrared range and high-power applications.

关键词： Gian prism laser damage threshold birefringence polarized optical crystal

Tellurate Nonlinear Optical Crystals

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Tellurate Nonlinear Optical Crystals

Investigating the moisture-induced transformation kinetics of 7-ethyl-10-hydroxy camptothecin DMF solvate into monohydrate

第十六届全国晶体生长与材料学术会议

作者： xutang tao Junjie Zhang Zhonghan Zhang Youxuan Sun State Key Laboratory of Crystal Materials Shandong University

Noncentrosymmetric(NCS) compounds are of current interest due to their multi-functional properties such as ferroelectricity,piezoelectricity,dielectric behavior,and second-order nonlinear optical(NLO) *** particular,their excellent nonlinear optical properties exhibit promising applications in the fields of frequency shifting,optical modulating telecommunications and signal ***,a class of new NCS materials have been synthesized with d0 transition metal cations(Mo6+ or W6+) and lone-pair cations(Se4+ or Te4+).Both kinds of ions are susceptible to the second-order Jahn-Teller effect which is believed to cause the unique properties of the materials *** BaTeMo2O9(β-BaTeMo2O9) 2 is such a typical *** group reported on the top-seeded solution growth of centimeter-sized single crystals and its functional properties.3,4 It has been demonstrated that β-BaTeMo2O9 possesses an effective NLO coefficient of 10.3 pm/V,being three times larger than that of KTP.4 Recently,centimeter-sized single crystals of Cs2TeMo3O12,5Na2TeW2O9,6 and Na2Te3Mo3O167 were successfully grown by our group,Halasyamani group,and Shen group,*** improve thermal conductivity of β-BaTeMo 2 O 9,we substitute Ba with *** systematically exploring the MgO-TeO 2-MoO3 ternary phase diagram,we identified *** measurements revealed that MgTeMoO6 exhibits strong SHG(～1.5 KTP),and is type-I phase-matchable.8

关键词： nonlinear optical crystals tellurate second-order Jahn-Teller(SOJT) crystal growth

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Investigating the moisture-induced transformation kinetics o...