具有最佳几何形状的超高反射率光子晶体膜

IF 5.4 1区 物理与天体物理 Q1 OPTICS
APL Photonics Pub Date : 2024-07-30 DOI:10.1063/5.0204067
F. Zhou, Y. Bao, J. J. Gorman, J. R. Lawall
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引用次数: 0

摘要

具有亚波长周期的光子晶体 (PhC) 结构被广泛用于衍射光学,包括具有纳米级厚度的高反射率膜。在此,我们报告了一种二维 PhC 氮化硅膜镜的设计程序,该程序利用严格耦合波分析获得的模拟结果提供最佳晶体几何形状。Downhill Simplex 算法是一种稳健的数值方法,用于寻找多变量函数的局部极值,随着膜厚度的变化,该算法被用于优化六边形和方形晶格 PhC 的周期和孔半径。根据这些设计原则,由氮化硅制成的纳米 PhC 膜被用作光腔的输入耦合器,使腔的最大精细度达到 33 000,对应的反射率为 0.999 82。我们研究了空腔模式的光斑大小对 PhC 所起的作用,结果表明存在一个最佳光斑大小,与预测结果十分吻合。我们发现,与方形晶格相比,六角形晶格的光谱反射范围更广,对制造公差的敏感性更低,对厚度小于 200 nm 的膜的反射率更高,这在空腔光学机械实验中可能是有利的。最后,我们发现我们构建的所有空腔都表现出良好的分辨偏振模分裂,我们预计这主要是由于氮化硅中的少量各向异性应力和制造过程中产生的 PhC 不对称造成的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Ultrahigh reflectivity photonic crystal membranes with optimal geometry
Photonic crystal (PhC) structures with subwavelength periods are widely used for diffractive optics, including high reflectivity membranes with nanoscale thickness. Here, we report on a design procedure for 2D PhC silicon nitride membrane mirrors providing optimal crystal geometry using simulation results obtained with rigorous coupled-wave analysis. The Downhill Simplex algorithm, a robust numerical approach to finding local extrema of a function of multiple variables, is used to optimize the period and hole radius of PhCs with both hexagonal and square lattices, as the membrane thickness is varied. Following these design principles, nanofabricated PhC membranes made from silicon nitride have been used as input couplers for an optical cavity, resulting in a maximum cavity finesse of 33 000, corresponding to a reflectivity of 0.999 82. The role played by the spot size of the cavity mode on the PhC was investigated, demonstrating the existence of an optimal spot size that agrees well with predictions. We find that, compared to the square lattice, the hexagonal lattice exhibits a spectrally wider reflective range, less sensitivity to fabrication tolerances, and higher reflectivity for membranes thinner than 200 nm, which may be advantageous in cavity optomechanical experiments. Finally, we find that all of the cavities that we have constructed exhibit well-resolved polarization mode splitting, which we expect is due primarily to a small amount of anisotropic stress in the silicon nitride and PhC asymmetry arising during fabrication.
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来源期刊
APL Photonics
APL Photonics Physics and Astronomy-Atomic and Molecular Physics, and Optics
CiteScore
10.30
自引率
3.60%
发文量
107
审稿时长
19 weeks
期刊介绍: APL Photonics is the new dedicated home for open access multidisciplinary research from and for the photonics community. The journal publishes fundamental and applied results that significantly advance the knowledge in photonics across physics, chemistry, biology and materials science.
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