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Low-loss optical waveguides made with a high-loss material

机译:用高损耗材料制成的低损耗光波导

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摘要

a Conceptual illustration of how HCGs could be integrated into a set of devices as absorptive electrodes to drive the respective active region. Here, the light (displayed as arrows) travels in standard passive waveguides and enters and exits the HCG sections (orange gratings) with the active material in between through adiabatic mode conversion tapers. b Basic geometry of an HCG waveguide with grating thickness t, period G, fill factor η = b/G and waveguide width d. Light with wavevector k at high incidence angle θ is reflected at the grating (red arrows). The pink area illustrates the cross-section of the HCG waveguide mode. c Reflectivity spectrum calculated with RCWA of a single HCG as the grating thickness t is varied while keeping other geometry parameters fixed at η = 60%, G = 135 nm and θ = 80°. Blue contour lines enclose the regime where reflectivity R > 99% holds, showing that the high reflectivity is broadband (>100 nm in wavelength at t = 135 nm) and resilient to small grating thickness variations (±15 nm at a λ = 550 nm wavelength). d 3D FDTD simulated waveguide dispersion for Ez-polarized light with the geometry parameters η = 60%, t = 135 nm, h = 220 nm and d = 5000 nm. Black circles show the different modes supported by the HCG waveguide. The red and blue lines indicate the SiON and SiO2 light lines, respectively. The black dashed line corresponds to an effective index neff = 1.55
机译:如何将HCGS集成到一组设备中作为吸收电极的概念图示,以驱动各个有源区域。这里,光(显示为箭头)在标准无源波导中行进并进入并通过绝热模式转换锥形与活性材料一起进入并离开HCG部分(橙色光栅)。 B具有光栅厚度T,周期G,填充因子η= B / G和波导宽度D的HCG波导的基本几何形状。具有高入射角θ的波浪k的光在光栅(红色箭头)处反射。粉红色区域示出了HCG波导模式的横截面。使用单个HCG的RCWA计算作为光栅厚度T的RCWA计算的C反射率谱,同时保持固定在η= 60%的其他几何参数,G = 135nm和θ= 80°。蓝色轮廓线封装反射率R> 99%保持的政权,表明高反射率是宽带(在T = 135nm的波长下),并且弹性到小光栅厚度变化(λ= 550nm处±15nm波长)。 D 3D FDTD模拟用于EZ偏振光的模拟波导色散,几何参数η= 60%,T = 135nm,H = 220nm和d = 5000nm。黑色圆圈显示HCG波导支持的不同模式。红色和蓝线分别表示SiON和SiO2光线。黑色虚线对应于有效的索引neff = 1.55

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