Polarization independent integrated filter based on a cross-slot waveguide.
Polarization independent integrated filter based on a cross-slot waveguide.
复制标题
基于交叉槽波导的偏振独立集成滤波器。
作者：
M. Roussey;P. Stenberg;A. Bera;Somnath Paul;J. Tervo;M. Kuittinen;S. Honkanen
我们研究了一种基于交叉缝隙波导和布拉格光栅和光腔相结合的同轴带通滤波器，可以同时工作于TE和TM偏振。提出了不同类型的腔(C₂对称和C₄对称)，以优化滤波并使器件依赖于或独立于偏振。我们在极小的体积内表现出很强的光限制，这为进一步的传感应用提供了优势。此外，我们还展示了在腔中包含硅纳米线如何帮助引导和增加共振的幅度。在本研究中，我们同时使用傅立叶模态法和时域有限差分法进行数值模拟。
We investigate an in-line band pass filter, working both for TE and TM polarizations, based on a cross-slot waveguide merged with a Bragg grating and an optical cavity. Different types of cavities (C₂- and C₄-symmetric) are presented in order to optimize the filtering and make the device dependent or independent on the polarization. We show a strong light confinement in an extremely small volume, which offers an advantage for further sensing applications. Moreover, we show how the inclusion of a silicon nanowire in the cavity helps the guiding and increases the amplitude of the resonance. In this study we make use of both the Fourier Modal Method and the Finite Difference Time Domain method to perform the numerical simulations.