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New vistas in solar concentration with gradient-index optics

机译：梯度折射率光学器件在太阳集中的新视野

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摘要

Certain classes of gradient-index lenses can achieve both perfect imaging and flux concentration at the fundamental limits. Although useful in microwave technology, eponymous Luneburg lenses have been viewed as esoteric idealizations for visible and near-infrared radiation due to the paucity of suitable materials and fabrication methods. We show that the classic Luneburg problem was constrained in subtle, implicit ways that can be relaxed. With the extra degrees of freedom, we demonstrate new gradient-index profiles that can accommodate both realistic, readily available materials and existing manufacturing technologies, while compromising neither perfect imaging nor maximum concentration (confirmed by raytrace simulation) - thereby opening new vistas for solar concentration and other visible and near-infrared applications. Specifically, the broader genres of solutions identified here permit a far smaller range of refractive indices than previously believed, with minimum required refractive index values well above unity, at arbitrary lens f-number, with less sensitivity to dispersion losses than conventional lenses.
机译：某些类别的渐变折射率镜头可以在基本极限下实现完美的成像和光通量集中。尽管在微波技术中很有用，但由于缺乏合适的材料和制造方法，同名的Luneburg透镜已被视为对可见光和近红外辐射的深奥理想化。我们证明了经典的吕讷堡问题是通过可以放松的微妙，隐含方式来约束的。借助额外的自由度，我们展示了新的梯度折射率分布图，可以适应现实的，易于获得的材料和现有的制造技术，同时又不损害完美的成像或最大的聚光度（通过射线追踪仿真确认），从而为太阳能聚光打开了新的视野以及其他可见和近红外应用。具体地说，这里确定的更宽泛的解决方案允许折射率范围比以前认为的要小得多，在任意透镜f值下，最小要求的折射率值都远高于1，与常规透镜相比，对色散损失的敏感性较低。

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  • 来源
  • 会议地点 San Diego CA(US)
  • 作者

    Panagiotis Kotsidas; Vijay Modi; Jeffrey M. Gordon;

  • 作者单位

    Mechanical Engineering Department, Columbia University, 220 S.W. Mudd Building, 500 W. 120th St., New York, NY 10027, USA;

    Mechanical Engineering Department, Columbia University, 220 S.W. Mudd Building, 500 W. 120th St., New York, NY 10027, USA;

    Department of Solar Energy and Environmental Physics, Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boqer Campus 84990, Israel;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 电气照明;
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