Photonic quasi-crystal based integrated optic devices

自20世纪80年代末提出光子晶体概念以来，光子晶体的研究活动不断增加。 在理论分析和应用方面取得了重大进展，在实验室环境中证明了许多设备设计。 20世纪90年代，高旋转对称光子准晶体首次出现，并显示出平移对称光子准晶体的重要性质。 然而，他们得到了较少的关注，因为所需的理论工具，以彻底分析的结构仍然缺乏和结构制造是比较困难的。 本研究计画的重点是透过理论分析、结构制造与元件开发的进步，来提升光子准晶体的技术。 理论上的进展将遵循沿着探索光子准晶体的旋转对称性质的路线，其目标是将极谱分解与极带结构联系起来。 现有的内部开发的模拟工具将根据理论的进步和所选的设备配置进行增强。 在结构的制造中，计划是探索SOI，LiNbO 3和玻璃中光子准晶体的生产和表征。 选择这三种衬底的原因如下：SOI为光子准晶体结构提供了高的介电对比度，并显示出下一代器件的高潜力。LiNbO 3是一种成熟的衬底技术，显示出几种有趣的光学特性，如双折射，并且是电光的。 LiNbO 3还保留了光子准晶体结构的高介电对比度。玻璃提供了与光纤技术兼容的介电值，因此光纤-波导耦合更简单。 高介电对比度是通过用薄的高介电包层加载玻璃波导来实现的。 制造的结构将在现有的光学测量实验室中进行表征，并且显示出有希望的结果的设计将被配置到光学设备中。SOI研究的很大一部分将与亚利桑那大学光学科学中心的研究人员合作进行。

Research activities in translationally symmetric photonic crystals have continuously increased since its conception in the late 1980s. Significant advances in theoretical analysis and applications have been made with numerous device designs proven in the laboratory environment. In the 1990s, the high rotationally symmetric photonic quasi-crystal made its debut and was shown to display the important properties of the translation symmetric counterparts. However they have received less attention as the theoretical tools required to thoroughly analyze the structures are still lacking and structure fabrication is more difficult. This research project is focused on advancing the photonic quasi-crystal know how through advancements in theoretical analysis, structure fabrication and device development. Theoretical advancements will follow along the lines of exploring the rotational symmetry properties of photonic quasi-crystals with the objective of linking a polar spectral decomposition with a polar band structure. Existing in-house developed simulation tools will be enhanced based on the theoretical advancements and chosen device configurations. In the fabrication of structures, the plan is to explore the production and characterization of photonic quasi-crystals in SOI, LiNbO3 and glass. These three substrates are selected for the following reasons, SOI provides a high dielectric contrast for photonic quasi-crystal structures and displays a high potential for next generation devices. LiNbO3 is a mature substrate technology showing several interesting optical properties such as birefringence and is electro-optic. LiNbO3 also retains a high dielectric contrast for photonic quasi-crystal structures. Glass provides a dielectric value compatible with the optical fiber technology and as such fiber-waveguide coupling is simpler. The high dielectric contrast is achieved by loading the glass waveguide with a thin high dielectric cladding. Structures fabricated will be characterized in the existing optical measurement laboratory and designs showing promising results will be configured into optical devices. A large portion of the SOI research will be conducted in collaboration with a researcher at the University of Arizona's Optical Sciences center.