Nanophononic thin-film filters and mirrors studied by picosecond ultrasonics
Nanophononic thin-film filters and mirrors studied by picosecond ultrasonics
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通过皮秒超声波研究纳米声薄膜滤波器和镜子
DOI：
10.1063/1.3295701
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发表时间：
2010
影响因子：
4
通讯作者：
A. Lemaître
中科院分区：
文献类型：
--
作者：
N. Lanzillotti;B. Perrin;A. Fainstein;B. Jusserand;A. Lemaître
利用皮秒超声波研究了优化的声子薄膜滤波器。宽带反射镜和基于非周期性多层膜的滤色器被优化以工作在亚太赫兹范围内，并通过分子束外延生长。时间分辨差分光学反射率实验进行与泵浦和探测脉冲入射在基板的相对侧。我们提供了声子器件的宽带传输曲线。计算结果与标准传递矩阵法模拟结果吻合较好。此外，我们还分析了自由表面的影响和铝覆盖层对非周期器件响应的影响。
Optimized acoustic phonon thin-film filters are studied by picosecond ultrasonics. A broadband mirror and a color filter based on aperiodic multilayers were optimized to work in the subterahertz range, and grown by molecular beam epitaxy. Time resolved differential optical reflectivity experiments were performed with pump and probe pulses incident on opposite sides of the substrate. We provide broadband transmission curves for the phonon devices. The results are in good agreement with standard transfer matrix method simulations. In addition, we analyze the effects of the free surface and the influence of an Al capping layer on the response of the aperiodic devices.