星体掠食与氧化铝草：可见光和近红外波段的抗反射涂层在IPX-Clear微透镜上的应用，通过草状氧化铝辅助
Star Grazing with Alumina Grass: Antireflection coatings in the visible and near-infrared on IPX-Clear Microlenses assisted by Grass-like Alumina
AI总结：
利用原子层沉积技术在IPX-Clear微透镜上应用草状氧化铝抗反射涂层，以提高可见光和近红外波段的透射率，减少光反射损失，提升天文观测效率。
摘要：
双光子聚合（2PP）使能够制造具有复杂自由成形几何形状的高精度微光学器件成为可能，为定制天文光学开辟了新的参数空间。在可用的树脂中，新开发的IPX Clear特别适合可见光应用，提供在可见-近红外波段的高透射率、低表面粗糙度和优异的形状保真度。然而，空气-聚合物界面的菲涅耳反射引入了显著的光学损耗，在低信号天文观测中是不利的。先前的研究显示，在玻璃和熔融石英上应用草状氧化铝涂层可使400-900nm波段的平均透射率从91.9%提高到约99%。在这里，我们探索通过原子层沉积（ALD）将此类涂层应用于IPX-Clear微光学器件上400-1700nm波段的可行性。草状氧化铝抗反射（AR）涂层可通过在空气到IPX Clear基质之间创建逐渐的折射率过渡来近似理想折射率条件，从而抑制表面反射。虽然草状涂层已在大尺寸光学器件上得到应用，而等离子体ALD薄膜已应用于2PP微光学器件，我们首次展示了在新IPX-Clear树脂制成的2PP微透镜上应用氧化铝草。我们讨论了关键挑战和工艺步骤，并观察到在400-850nm波段范围内，氧化铝草涂层的微透镜仅损失约0.3%的光子到反射。未来的工作将测试在400-1700nm波段的性能，并探索改进的环境耐久性，例如二氧化硅覆盖层。结合IPX Clear的高光学透明度，这些涂层使定制设计的高效率微透镜适用于天文应用。
英文摘要：
Two-photon polymerization (2PP) enables fabrication of high-precision micro-optics with complex freeform geometries, opening a new parameter space for custom astronomical optics. Among available resins, the newly developed IPX Clear is particularly well suited for visible applications, offering high transmission across the visible-near-IR, low surface roughness, and excellent shape fidelity. However, Fresnel reflections at the air-polymer interface introduce significant optical losses, which are detrimental in low-signal astronomy. Previous studies show grass-like alumina coatings on glass and fused silica can raise average transmission from 91.9% to approximately 99% over 400-900 nm. Here we explore the feasibility of Atomic Layer Deposition (ALD) to apply such coatings to IPX-Clear micro-optics over 400-1700 nm. Grass-like alumina anti-reflective (AR) coatings can approximate the ideal index condition by creating a gradual refractive-index transition from air to bulk IPX Clear, suppressing surface reflections. While grass-like coatings are established on bulk optics and conformal ALD films have been applied to 2PP micro-optics, we demonstrate - for the first time - alumina grass on 2PP microlenses made with the new IPX-Clear resin. We discuss key challenges and process steps, and observe that alumina-grass-coated microlenses lose only approximately 0.3% of photons to reflection in the 400-850 nm range. Future work will test performance across the full 400-1700 nm band and explore improved environmental resilience, e.g., a SiO2 overcoat. Combined with the high optical transparency of IPX Clear, these coatings enable custom-designed, highly efficient microlenses for astronomical applications.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
