偏振发光二极管的设计研究

	偏振发光二极管的设计研究
其他题名	The Design of Polarized Light-emitting Diodes
	周昂
学位类型	硕士
导师	梁静秋
	2015-11
学位授予单位	中国科学院大学
学位专业	光学
关键词	发光二极管光子晶体偏振层液晶可调谐器件数值模拟
摘要	随着生产工艺的不断提高和成本的下降，发光二极管已经成为21 世纪的理想照明光源。随着发光二极管应用范围的扩大和应用要求的提高，对其的偏振度的要求也越来越高。以二维光子晶体作为集成偏振层的发光二极管以其出光效率高、结构紧凑、工艺兼容性好、可调谐等优点成为解决这一问题的重要方案。集成于LED 表面的二维光子晶体层是在传统光子晶体偏振片的基础上针对 LED 的出光特点制成的。其原理是光子晶体对不同模式光拥有不同传输特性，通过合理设置光子晶体的结构参数，如占空比、晶格结构、介质孔形状等，可以实现对模式的分离，从而为高出光效率、高偏振度的LED 的制造提供了可能。而利用向列型液晶重构过程中折射率的变化，还可以制作可调谐的光子晶体偏振层。本文基于二维光子晶体偏振层的优异特性，对其进行结构设计和参数优化。采用的具体数值模拟算法是平面波展开法。为了克服常用设计软件对光子晶体结构的限制，本文从基础理论出发，设计了一种可用于任意晶胞形状的离散化数值模拟算法并编写了相应的程序。在此基础上对光子晶体的各个参数逐一进行优化。得出了光子晶体占空比对带宽影响的非线性关系，晶格结构的比较与选择，介质孔拓扑结构对禁带宽度的影响与其拓扑荷数量有关等经验结论，并在大量模拟数据的支持下给出了一个较优的基础结构。在上述结构的基础上，本文通过模拟分析了传统液晶掺杂光子晶体偏振片中，利用禁带边缘移动实现调谐的方案的优缺点。进而提出了利用缺陷态实现光子晶体偏振开关的模型。模拟结果显示该模型可以在LED 的蓝光谱段创造一个2nm 宽的窗口区，可用于偏振片的开关。上述模型开关效果相对于传统方法有较大的提升，为LED 上的集成光子晶体层设计提供了新思路，可以作为进一步实用化研究的理论基础。
其他摘要	With the continuous improvement of production processes and the decline in the cost, light-emitting diodes have become the ideal lighting source of the 21st century. As the expansion of the application area of light emitting diodes and improvement of application requirements, the requirement of polarization degree is increasing. The twodimensional photonic crystal polarization layer, which is integrated onto a LED, has become an important solution to this problem, benefit from its high light efficiency, compact structure, process compatibility, tunable, etc. 2D photonic crystal layer integrated onto LED surface was based on the traditional photonic crystal polarizer, and had been improved by applying the characteristics of the LED. The principle was that photonic crystals have different light transmission characteristics for different models. Through a reasonable set of photonic crystal structural parameters, such as the duty cycle, the lattice structure, medium pore shape, etc., separation mode could be achieved. A possibility to manufacture LEDs with high optical efficiency, high polarization degree may be provided. The changes in the refractive index of nematic liquid crystal during the reconstruction process, could also be used in the tunable photonic crystal polarization layer. Based on the excellent properties of two-dimensional photonic crystal polarization layer, its structural design and parameters were optimized. The numerical simulation algorithm was the plane wave expansion method. In order to overcome common design software’s restrictions on the photonic crystal structure, the paper designed a discrete numerical simulation algorithm which can be used with any cell shape and prepared the corresponding program. On this basis, various parameters of photonic crystals are individually optimized. The non-linear relationship between the bandwidth and the duty cycle was obtained. Different lattice structure was selected and compared. The relationship between the band gap and m, the number of its topological charge, was studied. An optimal infrastructure was given based on these experiences and a large number of analog data. Based on the above structure, the paper analyzed the advantages and disadvantages of conventional liquid crystal doped photonic crystal polarizers, which use the forbidden band edge mobile solutions to achieve tuned characteristic. The photonic crystal defect states polarization was proposed. Simulation results showed that the model can create a 2nm wide window area in the blue spectrum. The above model has greatly improved the traditional method for designing an integrated photonic crystal layer on the LED, and provides a new way, as a theoretical basis for further practical research.
语种	中文
文献类型	学位论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/49229
专题	中科院长春光机所知识产出
推荐引用方式 GB/T 7714	周昂. 偏振发光二极管的设计研究[D]. 中国科学院大学,2015.

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