Resonant Leaky-Mode Photonic-Crystal Devices with Engineered Spectra

这个项目的目标是对与周期性折射率晶格相关的共振漏模式进行分析、数值和实验研究，如光栅和光子晶体。大量的模拟表明，具有二元分布的单层亚波长周期性漏模波导膜可以应用于提供非常广泛的定制光谱特性的光学元件。这些具有一维周期的稀疏元件可用作新型窄线带通滤光片、偏振宽带反射器、偏振器、偏振无关元件和宽带减反射器。该项目致力于基于这些结构的新器件概念的制造和表征，主要目标如下：1.开发具有弱调制不对称轮廓的谐振元件的分析模型，以阐明在此限制下的详细的共振物理和漏模相互作用。数值量化了通过增加均质层实现的光谱增强。对共振漏模光子能带结构进行了数值表征。4.数值量化共振漏模空间场分布，阐明漏模相互作用动力学。5.使用绝缘体上硅晶片制造和测试谐振元件。智能优点：该项目通过解决亚波长泄漏模谐振器件技术的基本现象，为光子器件研究提供了新的、创造性的方向。初步结果表明，一类新的光学元件是可能的，并解释了相关器件可能如何实现。根据光子能带结构及其与元素结构对称性的关系，解释了相关的物理性质。共振时漏模的相互作用动力学有助于形成数值模拟所观察到的不同的谱带。漏模谱的位置、谱密度和相互作用的水平对于理解器件的运行是非常重要的。这些想法值得进一步的理论和实验研究和开发。更广泛的影响：单层漏模元件的功能可以与多层均匀薄膜元件相媲美。传统的光学薄膜被用来设计和制造具有不同光谱特征的元件，在光学系统中得到了广泛的应用。该方案中感兴趣的导模共振元件具有类似的光谱通用性，但受不同的物理控制。因此，可以预见在功能和应用方面的新可能性，其可以提供与薄膜光学领域互补的能力。最后，该项目将使研究生和本科教育受益，并增进参加工程暑期项目的众多高中生和教师的经验。

0524383MagnussonThe goal of this project is to conduct analytical, numerical, and experimental research on the resonant leaky modes associated with periodic refractive-index lattices such as gratings and photonic crystals. As shown by numerous simulations, single-layer subwavelength periodic leaky-mode waveguide films with binary profiles can be applied to fashion optical elements that provide a remarkably broad variety of tailored spectral characteristics. These sparse elements with one-dimensional periodicity can function as new types of narrow-line bandpass filters, polarized wideband reflectors, polarizers, polarization-independent elements, and as wideband antireflectors. The project addresses fabrication and characterization of new device concepts based on these structures with the main objectives as follows:1. Develop an analytical model for resonance elements with weakly modulated asymmetric profiles to elucidate the detailed resonance physics and leaky-mode interactions in this limit.2. Numerically quantify spectral enhancements realized by addition of homogeneous layers.3. Numerically characterize the resonant leaky-mode photonic band structure. 4. Numerically quantify resonant leaky-mode spatial field distributions to clarify the leaky-mode interaction dynamics. 5. Fabricate and test resonant elements using silicon-on-insulator wafers.Intellectual merit: This project provides new, creative directions in photonic device research by addressing fundamental phenomena for subwavelength leaky-mode resonant device technologies. The preliminary results indicate that a new class of optical elements is possible and explain how pertinent devices might be implemented. The associated physical properties are explained in terms of the photonic band structure and its relation to the structural symmetry of the elements. The interaction dynamics of the leaky modes at resonance contribute to sculpting the diverse spectral bands observed by numerical simulations. The leaky-mode spectral placement, their spectral density, and their levels of interaction are shown to be fundamentally important in understanding device operation. These ideas merit further theoretical and experimental research and development as proposed.Broader impacts: Single-layer leaky-mode elements can have functionality somewhat comparable to multilayer homogeneous thin-film elements. Traditional thin optical films are applied to design and fabricate elements with diverse spectral features which are widely used in optical systems. The guided-mode resonance elements of interest in this proposal possess analogous spectral versatility but are governed by different physics. Thus, new possibilities in function and applications can be envisioned that may provide complementary capability with the field of thin-film optics. Finally, the project will benefit graduate and undergraduate education and enhance the experience of numerous high school students and teachers attending summer programs in engineering.