Floquet-Bloch theory is used to calculate the electromagnetic fields in a leaky-mode grating-assisted directional coupler (LM-GADC) fabricated with semiconductor and glass materials. One waveguide is made from semiconductor materials (refractive index /spl ap/3.2) while the second is made from glass (refractive index /spl ap/1.45). The coupling of light between the two waveguides is assisted by a grating fabricated at the interface of the glass and semiconductor materials. Unlike typical GADC structures where power is exchanged between two waveguides using bound modes, this semiconductor/glass combination couples power between two waveguides using a bound mode (confined to the semiconductor) and a leaky mode (associated with the glass). The characteristics of the LM-GADC are discussed. Such LM-GADC couplers are expected to have numerous applications in areas such as laser-fiber coupling, photonic integrated circuits, and on-chip optical clock distribution. Analyses indicate that simple LM-GADC's can couple over 40% of the optical power from one waveguide to another in distances less than 1.25 mm.
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机译:Floquet-Bloch理论用于计算由半导体和玻璃材料制成的漏模光栅辅助定向耦合器(LM-GADC)中的电磁场。一个波导由半导体材料制成(折射率/ spl ap / 3.2),第二个波导由玻璃制成(折射率/ spl ap / 1.45)。两个波导之间的光耦合由在玻璃和半导体材料的界面处制造的光栅辅助。与典型的GADC结构不同,在典型的GADC结构中,使用绑定模式在两个波导之间交换功率,这种半导体/玻璃组合使用绑定模式(限制于半导体)和泄漏模式(与玻璃相关)在两个波导之间耦合功率。讨论了LM-GADC的特性。预计此类LM-GADC耦合器将在激光光纤耦合,光子集成电路和片上光学时钟分配等领域具有众多应用。分析表明,简单的LM-GADC可以在不到1.25 mm的距离内将40%以上的光功率从一个波导耦合到另一个波导。
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