CHARACTERISTICS OF OPTICAL GUIDED-MODE RESONANCE FILTERS

本基金用于研究 周期介质谐振特性 波导几何结构。 理论研究表明， 结构可以作为有效的开关 并且作为任意窄带无损 filters. 理论和实验 工作提出。 严格的耦合- 波动理论将被用来研究 两者的导模共振特性 体和表面浮雕光栅结构， 详细 共振将是 其特征在于， 波长，光栅厚度，角度 入射，光栅周期，体介电常数， 入射波极化和介电常数 调制幅度 多个电介质 将考虑层的几何形状， 导模性能 谐振滤波器将与 经典的，根本不同的，法布里- 佩罗滤波器。 理论上来说 实验测试。 为此，散装- 光栅过滤器将全息 记录在重铬酸盐明胶中 玻璃和石英波导膜 印刷受体. 表面浮雕光栅过滤器将 用钇铁石榴石生产 钆镓石榴石波导 印刷受体. 动态，可转动的过滤器将 产生的激光感应光栅， 光折变晶体（GaAs）薄膜。 的 这项研究的意义在于， 基本现象与 解释衍射结构。 这项工作的许多有用的应用可以 可以设想，包括激光腔滤波器， 窄线镜、可调谐滤波器、电 光学开关和增强型薄膜 的设计.

This grant is to study the guided-mode resonance properties of periodic dielectric structures in waveguide geometry. Theoretical work indicates that such structures can function as efficient switches and as arbitrarily narrow-band lossless filters. Both theoretical and experimental work is proposed. The rigorous coupled- wave theory will be used to study the guided-mode resonance properties of both bulk and surface-relief grating structures in detail. The resonances will be characterized with respect to the optical wavelength, grating thickness, angle of incidence, grating period, bulk permittivity, incident-wave polarization and permittivity modulation amplitude. Multiple dielectric layer geometries will be considered and the performance of the guided-mode resonance filters will be compared with the classical, fundamentally different, Fabry- Perot filters. The theory will be experimentally tested. For this, bulk- grating filters will be holographically recorded in a dichromated gelatin waveguide film on glass and quartz substrates. Surface-relief grating filters will be produced in yttrium iron garnet waveguides on gadolinium gallium garnet substrates. Dynamic, turnable filters will be produced by laser-inducing gratings in photorefractive crystal (GaAs) films. The significance of the research is that new, fundamental phenomena associated with diffractive structures are being explained. Many useful applications of this work can be envisioned, including laser cavity filters, narrow-line mirrors, tunable filters, electro- optic switches, and enhanced thin-film designs.