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Chiral surface waves supported by biaxial hyperbolic metamaterials

Light(Science & Applications) 2015年第1期4卷 187-191页

作者： Wen-Long Gao Feng-Zhou Fang Yong-Min Liu Shuang Zhang State Key Laboratory of Precision Measuring Technology and Instruments Tianjin UniversityTianjin 300072China School of Physics&Astronomy University of BirminghamBirmingham B152TTUK Department of Mechanical and Industrial Engineering Northeastern UniversityBostonMA 02115USA Department of Electrical and Computer Engineering Northeastern UniversityBostonMA 02115USA

We discover a new kind of surface wave on biaxial hyperbolic metamaterial,which,in the k-space,connects the two diabolical points(or conical singularities)of the equifrequency ***,the propagation of such surface wave is found to be sensitive to the refractive index of the surrounding dielectric medium,showing a convex,concave or flat phase front when the refractive index is ***,the surface wave shows an elliptically polarized state,in which helicity is dependent on the propagation *** feature can be utilized for the spin-controllable excitation of surface waves,opening a gateway towards integrated photonic circuits with reconfigurable functionalities.

关键词： metamaterial spin orbital coupling surface wave

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The effect from modified ligand and systematic deuteriation to the photophysical behaviors of transition metal complex OLED materials

The effect from modified ligand and systematic deuteriation ...

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第一届全国光功能材料青年学者研讨会2018

作者： Fu-Quan Bai International Joint Research Laboratory of Nano-Micro Architecture Chemistry Institute of Theoretical ChemistryJilin University

In recent years, the cyclometalated Pt(Ⅱ) and Ir(Ⅲ) complexes with different ligands have been used as prospective blue phosphorescent materials. For improving this material further, the introduction of o-carborane is treated as an excellent strategy to promote the luminescent efficiency for Pt complexes. A series of new materials show over 82% phosphorescence quantum yield and good stability, but still it is not elucidated in the round. In my work, stable o-carborane cages are introduced into the traditional C,N,C-cyclometalated Pt(Ⅱ)complexes in turn to explore its influence completely in contrast to original phenyl ligand from the view of theoretical investigation. Unlike traditional strategies on enhancing the radiative decay process, or reducing the non-radiative decay process, through cumbersome ligands decorations, our simple and controllable deuteriation strategy which is insensitive to the radiative decay process, enable to suppress the non-radiative decay process by almost a half for homoleptic or heteroleptic Ir(Ⅲ) complexes. At present, with the improvement of computational ability, theoretical calculations can obtain strictly consistent results with experiments at the single molecule level and accurately predict the design and potential of new materials. The strategies mentioned above can provide a viable guideline for design and regulate several aspects of highly efficient blue phosphorescent materials.

关键词： Theoretical calculation Luminescent quantum efficiency Nonradiative decay Reorganization energy spin orbital coupling

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