有源材料、光模和腔对电光调制性能的影响
Active Material, Optical Mode and Cavity Impact on electro-optic Modulation Performance
摘要：
本文分析了三种不同的材料Si、ITO和石墨烯;以及体、槽和混合三种不同类型的模式结构;基于它们的电光和电吸收方面的性能。研究了电光调谐的三个主要特性：材料依赖性、模式依赖性和腔依赖性。该材料的特点是与建立的模型和允许的范围内，其关键参数光谱分析所需的调整，在头脑中，分类成n和k的主要区域合理的电光和电吸收的应用，分别。一个半解析的方法，与本征模计算的有限元模拟的帮助下，用于这项工作。电光调谐，即法布里-珀罗腔内的谐振位移特性的研究与模式和缩放的关注。调谐改变了由Kramers Kronig关系决定的模式的有效复折射率，该关系随后建议在谐振移位和增加的损耗之间进行权衡。分析了腔中不同模式的电调谐特性，随后选择了相对于载流子浓度和腔缩放的品质因数Δ-λ/Δ-α，以找到预期的合适区域以获得所需的调谐效果。
英文摘要：
In this paper, three different materials Si, ITO and graphene; and three different types of mode structures bulk, slot and hybrid; based on their electrooptical and electro absorptive aspects in performance are analyzed. The study focuses on three major characteristics of electrooptic tuning, i.e. material, modal and cavity dependency. The materials are characterized with established models and the allowed ranges for their key parameter spectra are analyzed with desired tuning in mind; categorizing into n and k dominant regions for plausible electrooptic and electro absorptive applications, respectively. A semi analytic approach, with the aid of FEM simulations for the eigenmode calculations, was used for this work. Electrooptic tuning i.e. resonance shift properties inside Fabry Perot cavities are investigated with modal and scaling concerns in mind. Tuning changes the effective complex refractive index of the mode dictated by the Kramers Kronig relations which subsequently suggest a tradeoff between the resonance shift and increasing losses. The electrical tuning properties of the different modes in the cavity are analyzed, and subsequently a figure of merit, delta-lambda/delta-alpha was chosen with respect to carrier concentration and cavity scaling to find prospective suitable regions for desired tuning effects.
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