使用透明相变材料的布拉格结构非易失性调谐
Nonvolatile Tuning of Bragg Structures Using Transparent Phase-Change Materials
AI总结：
本文通过建模与实验，利用非易失性透明相变材料 Sb2Se3 调谐布拉格光栅阻带滤波器和 Fabry-Perot 腔的谐振条件，仿真与实验验证了该设计方法的潜力、局限性及制造挑战。
摘要：
布拉格光栅通过对波导有效折射率的周期性调制，实现了片上光的高性能滤波和路由。在此，我们对利用周期性布拉格光栅的两种器件（阻带滤波器和 Fabry-Perot 腔）进行建模和实验演示，使用 Sb2Se3（一种非易失性且透明的相变材料）来调谐其谐振条件。通过仿真，我们表明硅与非晶态 Sb2Se3 之间相近的折射率可用于诱导宽带透明，而晶态则能增强这些布拉格器件中的折射率对比度。我们的实验结果展示了这种设计方法的潜力与局限性，并强调了未来实施中需要解决的特定制造挑战。
英文摘要：
Bragg gratings offer high-performance filtering and routing of light on-chip through a periodic modulation of a waveguide's effective refractive index. Here, we model and experimentally demonstrate the use of Sb2Se3, a nonvolatile and transparent phase-change material, to tune the resonance conditions in two devices which leverage periodic Bragg gratings: a stopband filter and Fabry-Perot cavity. Through simulations, we show that similar refractive indices between silicon and amorphous Sb2Se3 can be used to induce broadband transparency, while the crystalline state can enhance the index contrast in these Bragg devices. Our experimental results show the promise and limitations of this design approach and highlight specific fabrication challenges which need to be addressed in future implementations.
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