Fine-tuning of the optical properties of hollow-core light cages using dielectric nanofilms
Fine-tuning of the optical properties of hollow-core light cages using dielectric nanofilms
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DOI：
10.1364/ol.45.000196
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发表时间：
2020-01-01
期刊：
影响因子：
3.6
通讯作者：
Schmidt, Markus A.
中科院分区：
文献类型：
--
作者：
Jang, Bumjoon;Gargiulo, Julian;Schmidt, Markus A.
在这里，我们展示了直接激光写入片上空芯波导-所谓的光笼-的光学性质可以通过介电纳米膜控制到非常高的程度。利用低温原子层沉积(ALD)，氧化铝纳米薄膜被同心地沉积在围绕中央空气芯的高纵横比线束上，并通过反共振效应限制光。根据没有任何自由参数的模式截止模拟，实验观察到共振光谱随着薄膜厚度的增加而线性移动。这一现象可以用包层超模的色散变化来解释。由于笼子的几何形状和聚合物都不受薄膜沉积的影响，我们的结果表明，ALD是微调中空灯笼的性能和保护它们免受侵蚀性物质影响的重要工具，例如，与生物分析或量子技术相关。(C)2019年美国光学学会
Here, we show that the optical properties of direct-laser-written on-chip hollow-core waveguides-so-called light cages can be controlled to a very high degree by dielectric nanofilms. Using low-temperature atomic layer deposition (ALD), alumina nanofilms are concentrically deposited on the high-aspect strands that surround the central air core and confine the light via the anti-resonant effect. In accordance with modal cutoff simulations without any free parameters, a linear spectral shift of the resonances with increasing film thickness is experimentally observed. The phenomenon is explained by a shift in the dispersions of cladding supermodes. As neither cage geometry nor polymer is affected by the film deposition, our results suggest ALD to be an essential tool for fine-tuning the properties of hollow-core light cages and to protect them from aggressive substances, being relevant for, e.g., bioanalytics or quantum technology. (C) 2019 Optical Society of America