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A Novel Design of Grating Couplers for Efficient Broadband Coupling between Silicon-on-Insulator Nanophotonic Waveguides and Fibres
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A novel design of out-of-plane grating couplers is proposed for coupling between silicon-on-insulator nanophotonic waveguides and single-mode fibres. The coupler with the first-order diffraction coupling to the optical fibre is actually a second-order reflected grating with two times of period of the first-order grating. To enhance outcoupled power, a back hole is designed to form in the silicon substrate and a kind of metals is placed on the top acting as a reflection layer. The coupler is optimized using coupled-mode-based simulations, showing that the coupling efficiency to and from tapered optical fibre can be as high as 85% with 1dB bandwidth about 23 nm. 相似文献
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针对单光子源对高性能纳米腔的需要, 采用“柔性束缚"光子限制结构和时域有限差分法, 通过把时域和频域的光电场分布与理想高斯函数进行比较, 设计出一种高品质因子的光子晶体缺三腔(L3), 其Q值达Q=2.8×105, 有效模式体积为Veff=0.1813(λ/n)3, 相应的Purcell因子超过F=1.2×105. 此外, 提出一种定量描述腔性能优劣程度的能量系数分析法, 通过定量对比二维高斯分布下的场分布能量与总能量, 提高了腔的优化速度与准确性. 计算结果表明, 随着腔性能的优化, Q值正比于能量系数γ值直至饱和. 相似文献
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