Department of Physical Chemistry and Electrochemistry, Jagiellonian University, Ingardena 3, 30060 Krakow, Poland.
Nanotechnology. 2012 Feb 24;23(7):075303. doi: 10.1088/0957-4484/23/7/075303. Epub 2012 Jan 24.
In this paper, we demonstrate a distributed Bragg reflector (DBR) based on nanoporous anodic aluminum oxide (AAO) formed by pulse anodization. The AAO structure with alternating mild anodized (MA) and hard anodized (HA) layers having different porosities and thereby different refractive indices was fabricated in 0.3 M H₂SO₄ using potential pulses of 25 and 35 V. The effective refractive index of the HA layers can be tailored by changing the porosity of the HA layers. The porosity of the HA layers can be significantly increased by selective chemical etching of HA segments in 0.52 M H₃PO₄. Before etching, the porous AAO structure was supported by a polymer nanorod frame. On the selected surface area pores were infiltrated with polymers (polystyrene and PMMA). The designed AAO structure consists of alternating high and low refractive index layers and behaves as a distributed Bragg mirror reflecting light in two different ranges of wavelength. This behavior is extremely important in optical communication lines where two separate spectral bands of high reflectivity in the infrared region are desired.
本文展示了一种基于通过脉冲阳极氧化形成的多孔阳极氧化铝（AAO）的分布式布拉格反射器（DBR）。在 0.3 M H₂SO₄中使用 25 和 35 V 的电位脉冲，在交替的轻度阳极氧化（MA）和硬阳极氧化（HA）层中制造出具有不同孔隙率和不同折射率的 AAO 结构。HA 层的有效折射率可以通过改变 HA 层的孔隙率来调整。通过在 0.52 M H₃PO₄中选择性地化学腐蚀 HA 段，可以显著增加 HA 层的孔隙率。在腐蚀之前，多孔 AAO 结构由聚合物纳米棒框架支撑。在选定的表面积上，孔中填充有聚合物（聚苯乙烯和 PMMA）。设计的 AAO 结构由交替的高低折射率层组成，在两个不同的波长范围内表现为分布式布拉格反射镜，反射光。这种行为在光学通信线路中非常重要，在光学通信线路中，需要在红外区域中具有两个高反射率的单独光谱带。
