摘要
光子晶体自提出之日起就备受关注,其周期性的介电质结构使在其中传播的电磁波模态具有频带效应,并可以导致光子带隙的产生。当电磁波的频率恰巧落在禁带中时,电磁波将无法穿透该种介质,这种特性为有效操控电磁波行为提供了新的方法。随着对光子晶体研究的不断深入,人们发现光子晶体的导带也有众多妙用。由于光子晶体导带某些特殊的色散关系的存在,在一定频率范围内的电磁波会表现出不寻常的传播行为,如超棱镜效应、负折射效应、自准直效应等。这些效应在光集成、高密度光存储以及高灵敏度生物传感器等领域有着巨大的潜在应用价值。近年来,光子晶体色散特性与应用潜力的研究受到了高度重视,例如《科学》杂志选择负折射研究为2003年的十大科技成果之一。光子晶体的发展和应用将对未来的光电技术发展会产生难以估量的影响。
虽然人们对于光子晶体及其光学特性已经进行了大量的研究,但是这些研究大多数是针对标准类型光子晶体的,而对于其它广义光子晶体的研究依然不够完善。广义光子晶体以其丰富的空间变化提供了更多的研究内容。广义光子晶体包括周期性的光子晶体、渐变光子晶体、准周期光子晶体、非晶光子晶体等。本文主要提出了几种新型的渐变光子晶体,研究了这些光子晶体的特性,并用已知的和新提出的渐变光子晶体设计了多种光子晶体器件,利用平面波展开法和时域有限差分法进行了仿真模拟。之后利用双光束两次曝光法制备常规正方光子晶体,并利用制备的光子晶体提高了LED的发光效率。
本文的研究重点主要体现在以下两个方面:
1.渐变光子晶体的研究
常规光子晶体的性质研究已经比较成熟,然而广义光子晶体,尤其是渐变光子晶体的研究和器件设计方面依然有很大的研究空间。从第三章到第五章,主要提出了几种新型渐变光子晶体并研究了其光学特性,设计了多种光子晶体器件。
在第三章中,利用辐射型渐变光子晶体设计了一种新型的光子晶体分束器。这种分束器是由关于横轴对称的两个完全相同的1/4圆弧的辐射型光子晶体构成。为了提高分束器的透射率,加入了正方自准直光子晶体结构。通过增大自准直光子晶体的缺陷,光子晶体分束器总的透过率得到了很大的提升。而且这种光子晶体分束器系统可以很方便地调节分束比。辐射型渐变光子晶体分束器在光集成方面有很大的应用潜力。
第四章提出了一种新型的圆形渐变光子晶体,这种新型渐变光子晶体是二维常规光子晶体的一种变形结构,并且主要考虑了这种圆形渐变光子晶体的导通性质。这种新型的圆形渐变光子晶体可以实现光的不对称传输以及具有频率选择的光耦合器。由于圆形渐变光子晶体的方向禁带,从一个方向传播的光能够透过光子晶体,而从另一个方向传播的光则无法通过光子晶体。我们将两个方向透射过光子晶体的光强之差与光强之和的比定义为对比度,利用对比度来衡量光子晶体不对称传输的能力。利用这种结构,在数值模拟上实现了光的不对称传输,并得到了更高的对比度。由于这种圆形渐变光子晶体在特定频率范围内的光聚焦现象,透过圆形渐变光子晶体的光被汇聚到光子晶体波导中,并得到了一个很高的耦合效率。当改变圆形渐变光子晶体的参数时,透射率的峰值对应的频率会改变,从而使光耦合器具有频率选择效应。
第五章提出了一种新的渐变光子晶体结构,这种光子晶体结构不包含非线性及各向异性材料,是通过改变常规光子晶体横向和纵向两个方向的介质柱半径得到的。由于正方渐变光子晶体的方向禁带和自准直作用,从一个方向传播的光能够透过光子晶体,而从另一个方向传播的光则无法通过光子晶体。利用这种结构,在数值模拟上实现了光的不对称传输,并得到了更高的对比度。2.利用双光束两次曝光法制备光子晶体提高LED的发光效率LED以其低功耗、长寿命、体积小的特点,成为绿色节能的新型照明器件,然而由于LED的光提取效率低,使LED的寿命缩短,并造成了大量的能量损耗。光子晶体作为一种提高LED发光效率的有效手段,成为了目前研究的热门之一。全息干涉技术制备光子晶体以其制备迅速、一次成型、成本低等特点使得低成本实现高出光率光子晶体LED制作成为可能。在第六章,提出了利用双光束两次曝光制备光子晶体的方法,这种方法光路简单,易于调节,并且一次成型,以532nm可见光为光源,这种光源更易获得,并且在平台搭建和光路调节方面更具优势,配制了感光波长在532nm的光刻胶,成功制备占空比为1:1的二维正交光子晶体,并将光子晶体制作于GaN蓝光LED的ITO层中,使LED的发光效率提高了20%-27%。对于光子晶体提高LED发光效率的研究仍然需要改进和完善,但这种制作光子晶体的系统的设计,工艺简单,造价低廉,适合进行产业化生产。
综上所述,本文不仅提出了多种渐变光子晶体结构,研究了渐变光子晶体的光学特性,而且利用渐变光子晶体设计了多种光学器件。在论文的最后,提出了双光束两次曝光法制备正方光子晶体,并利用制备的光子晶体提高了LED的发光效率。本文所得结果对于光学集成及能源利用具有重要的参考价值。
Photonic crystals from the date of proposed is in focus for its periodic dielectric structure, which gives the electromagnetic wave propagating in photonic crystals a band structure mode, and can lead to the generation of photonic band gap. When the frequency of electromagnetic waves happens to fall in forbidden band, the electromagnetic waves will not be able to penetrate this kind of medium. This feature makes photonic crystals become a new means to effectively control the behavior of electromagnetic waves. With the development of the research, it was found that the conduction band of photonic crystals have many use as well. As some certain areas of the conduction band of photonic crystal has special dispersion relations, the propagation of electromagnetic waves in certain frequency range will show unusual behavior, Such as the super prism effect, negative refraction effect, since the collimation effect, etc. These effects have huge potential application value in optical integration, high-density optical storage and high sensitive biological sensors and other fields. In recent years, the research on dispersion characteristics and potential applications of photonic crystal has been highly valued by the international scientific circle. Science magazine choose negative refraction research as one of the top ten scientific and technological achievements in2003. The development and application of the research will have an incalculable impact on the future of photovoltaic technology.
Although there are a lot of research on photonic crystals and their optical properties, most is for standard type photonic crystal as the gradient photonic crystals with its long-range disorder short-range order provides more research content. In this paper, several new gradient photonic crystals are proposed, the characteristics of the photonic crystal is studied, using the known and the new proposed gradient photonic crystals, photonic crystal device is designed, and the simulation is done by using the plane wave expansion method and finite difference time domain method. Then we prepare regular square photonic crystal which improves LED luminous efficiency by using double-beam exposure method.
The focus of this article is mainly manifested in the following two aspects:
1、Research on the gradient photonic crystals
Research on properties of conventional photonic crystal is comparatively mature, while there is still a lot of space in research on gradient photonic crystal as well as the device design. From the third chapter to the fifth chapter, we proposed several new gradient photonic crystals and their optical properties are studied, also we design several photonic crystal devices.
In the third chapter, we design a new kind of photonic crystal splitter by using radiant gradient photonic crystal. The beam splitter is consist of two identical symmetrical about the horizontal axis of radiant photonic crystal1/4circular arc. To increase the beam splitter transmittance, we add the tetragonal self-collimation photonic crystal structure. By magnifying the defect of self-collimation photonic crystal, the total transmittance of photonic crystal splitter got a lot of ascension. And we can easily adjust the ratio of beam splitter. Radiant gradient photonic crystal splitter has great potential for application in optical integration. The fourth chapter puts forward a new type of circular gradient photonic crystal, a kind of deformation structure of the conventional two-dimensional photonic crystals, of which the conduction band property is mainly considered here. Using this new type of circular gradient photonic crystal, we implemented asymmetry transmission of light and frequency selective optical coupler. Due to the directional band gap of circular gradient photonic crystal, light from one direction can transmit through the photonic crystals, but can't do it from the other direction. Using this structure, we realize the asymmetry transmission of light on numerical simulation, and a higher contrast ratio is obtained. Thanks to the light focusing phenomenon in specific frequency range of the circular gradient photonic crystal, the light through this photonic crystal is gathered in the photonic crystal waveguide, and very high coupling efficiency is gotten. When the parameters of the circular gradient photonic crystal are changed, the corresponding frequency of the peak transmissivity will change to get the optical coupler with frequency selective effect.
The fifth chapter puts forward a new gradient photonic crystal structure, which does not contain nonlinear and anisotropic materials. It is obtained by changing the rods'radii along both horizontal and vertical directions. Due to the directional band gap and self-collimation effect of the square gradient photonic crystal, light from one direction can transmit through the photonic crystals, but can't do it from the other direction. Using this structure, we realize the asymmetry transmission of light on numerical simulation, and a higher contrast ratio is obtained.
2. Holographic fabrication of photonic crystals by double-beam exposure method for improving the extraction efficiency of LED
LED, for its characteristics of low power consumption, long life, small volume, become a new type of green energy-saving lighting devices. But the low Light extraction efficiency shortens the service life of LED, and causes a large number of energy losses. As an effective way to enhance the efficiency of the LED, photonic crystal became one of the hottest researches at present. With the characteristics of rapid preparation, one-step molding and low cost, holographic interference technique makes it possible to achieve higher rate of photonic crystal LED at a low cost.
In the sixth chapter, we use the double-beam double exposure method to create PhCs, the optical path is simple and easy to adjust, and PhCs are one-step forming. In the experiment,532nm laser is used as the light source, which is more accessible and has more advantages in platform building and light path adjustment. The photopolymer SU8polymerized at532nm and created2D PhCs with duty cycle1:1. The PhCs structures are transferred to ITO layer of GaN blue LED and the light extraction efficiency was increased by20%-27%. The research of improving the efficiency of light extraction by PhCs still needs further improvement and perfection, but this design of PhCs creation system is simple, low cost and suitable for industrial production, so it has bright prospects.
To sum up, this paper not only proposed a variety of gradient photonic crystal structure and studied the optical properties of gradient photonic crystals, but also designed a variety of optical devices using the gradient photonic crystals. At the end of the paper, we proposed the double beam twice exposure method to prepare photonic crystals and improve LED luminous efficiency by the photonic crystals prepared. The results obtained in this paper have important reference value for optical integration and energy utilization.
引文
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