Yamada Katsuaki, Lee Kyu Jin, Ko Yeong Hwan, Inoue Junichi, Kintaka Kenji, Ura Shogo, Magnusson Robert
Opt Lett. 2017 Oct 15;42(20):4127-4130. doi: 10.1364/OL.42.004127.
Resonant nanogratings and periodic metasurfaces express diverse spectral and polarization properties on broadside illumination by incident light. Cooperative resonance interactions may yield shaped spectra for particular applications, in contrast to a multilayer dielectric mirror. Here, we provide guided-mode resonance filters with flat-top spectra suitable for wavelength division multiplexing systems. Applying a single one-dimensional grating layer sandwiched by two waveguides, we theoretically achieve high-efficiency flat-top spectra in the near-infrared region. This result is obtained by inducing simultaneous nearly degenerate resonant modes. The resonance separation under this condition controls the width of the flat-top spectrum. This means we can implement spectral widths ranging from a sub-nanometer to several nanometers applying fundamentally the same device architecture.
共振纳米光栅和周期性超表面在入射光的宽边照明下表现出多样的光谱和偏振特性。与多层介质镜相比，协同共振相互作用可为特定应用产生成形光谱。在此，我们提供了适用于波分复用系统的具有平顶光谱的导模共振滤波器。通过应用夹在两个波导之间的单个一维光栅层，我们在理论上实现了近红外区域的高效平顶光谱。该结果是通过诱导同时出现的近简并共振模式获得的。在此条件下的共振间隔控制着平顶光谱的宽度。这意味着我们可以应用基本相同的器件架构实现从亚纳米到几纳米范围的光谱宽度。
