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Ultrathin Perfect Light Absorbers as Color Filters and Modulators

机译:超薄完美吸光剂,用作彩色滤光片和调制器

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摘要

Methods for spectrally controlling light absorption in optoelectronic devices have attracted considerable attention in recent years. The principle objectives of this research are to experimentally demonstrate spectrally selective perfect light absorption in static thin-film layer structures in the visible and near infrared and provide a path toward dynamically controlling this absorption. The absorber structure comprises a Fabry-Perot nanocavity made of ultrathin semiconductor and metal films. The absorption wavelength is controlled by either tailoring the thickness of the cavity, applying thermal annealing, altering the metal layer, or by applying an electrical voltage. Investigating static spectrally selective light absorption in the visible range resulted in fabricated devices that appear in different colors. These devices are substantially angle insensitive as well; their colors do not change when viewed at different angles. More than 90% of the incident light is absorbed even at large incident angles, up to +/-70°. Perfect light absorption was experimentally observed for deep sub-wavelength thick silicon films as thin as 1/27 of the absorption wavelength. Simulations were then undertaken and they agreed very well with real measurements. Dynamically tuning the absorption wavelength (changing the device color without tailoring the structural geometry) however was the ultimate goal in this optoelectronic device development effort. To that end, it is also shown in this work how an ultrathin indium antimonide (InSb) film integrated into a subwavelength-thick optical nanocavity can be used to create electrically tunable perfect light absorbers in the visible range; the color of the device can be changed in real time by applying an electrical voltage. It is predicted that these electrically tunable absorbers may also be used as optical modulators in the infrared. The projected 95.3% change in reflectance transforms the device from perfectly absorbing to highly reflective, which should make this technology attractive to the telecommunication (switching) industry.;This new technology paves the way for many applications such as color filters, wavelength selective photodetectors, biosensors, high resolution ultra-fast displays, solar cells, smart windows, and high-speed telecommunication switching. These absorbers require only simple thin-film fabrication processes, making them cost effective for large-area devices without resorting to sophisticated nanopatterning techniques.
机译:近年来,用于光谱控制光电子器件中的光吸收的方法引起了相当大的关注。这项研究的主要目的是通过实验证明在可见光和近红外光下静态薄膜层结构中的光谱选择性完美光吸收,并为动态控制这种吸收提供一条途径。吸收体结构包括由超薄半导体和金属膜制成的Fabry-Perot纳米腔。通过调整腔体的厚度,施加热退火,改变金属层或施加电压来控制吸收波长。研究可见光范围内的静态光谱选择性光吸收导致制成的设备以不同的颜色出现。这些设备也基本上对角度不敏感。从不同角度观看时,它们的颜色不会改变。即使在高达+/- 70°的大入射角下,也吸收了90%以上的入射光。对于厚至吸收波长的1/27的亚波长厚硅膜,实验观察到了完美的光吸收。然后进行了模拟,它们与实际测量非常吻合。动态调整吸收波长(在不调整结构几何形状的情况下更改设备颜色)是此光电设备开发工作的最终目标。为此,在这项工作中还显示了如何将集成到亚波长厚光学纳米腔中的超薄铟锑(InSb)膜用于在可见光范围内创建可电调谐的理想光吸收器。可以通过施加电压实时更改设备的颜色。据预测,这些电可调吸收器也可以用作红外光的调制器。预计反射率将发生95.3%的变化,从而使设备从完全吸收转变为高反射率,这将使该技术对电信(交换)行业具有吸引力。这项新技术为彩色滤光片,波长选择性光电探测器,生物传感器,高分辨率超快显示器,太阳能电池,智能窗户和高速电信交换。这些吸收器仅需要简单的薄膜制造工艺,从而使它们对于大面积器件具有成本效益,而无需借助复杂的纳米图案技术。

著录项

  • 作者单位

    The University of Alabama in Huntsville.;

  • 授予单位 The University of Alabama in Huntsville.;
  • 学科 Optics.;Nanotechnology.;Electrical engineering.
  • 学位 Ph.D.
  • 年度 2018
  • 页码 153 p.
  • 总页数 153
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 TS97-4;
  • 关键词

  • 入库时间 2022-08-17 11:53:08

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