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相关概念视频

Unsymmetric Bending - Angle of Neutral Axis01:15

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Unsymmetrical bending occurs when a structural member is subjected to bending moments in a plane that does not align with the member's principal axes. This scenario typically arises in beams and other structural components when loads are applied at non-ideal angles, introducing complexities in stress analysis.
When a bending moment is applied at an angle θ concerning the vertical axis of a symmetrical member, it can be resolved into components along the member's principal...
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A planar symmetry of charge density is obtained when charges are uniformly spread over a large flat surface. In planar symmetry, all points in a plane parallel to the plane of charge are identical with respect to the charges. Suppose the plane of the charge distribution is the xy-plane, and the electric field at a space point P with coordinates (x, y, z) is to be determined. Since the charge density is the same at all (x, y) - coordinates in the z = 0 plane, by symmetry, the electric field at P...
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By definition, a spherically symmetric body has the same moment of inertia about any axis passing through its center of mass. This situation changes if there is no spherical symmetry. Since most rigid bodies are not spherically symmetric, these require special treatment.
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折叠平面光学的离轴超表面.

Brandon Born1, Sung-Hoon Lee2, Jung-Hwan Song1

  • 1Geballe Laboratory for Advanced Materials, Stanford University, Stanford, CA, USA.

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概括
此摘要是机器生成的。

本研究提出了一种新的设计,用于使用低指数材料的离轴元分级. 这些超表面光学能够有效地重定向和聚焦可见光,为紧的光学系统铺平了道路.

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科学领域:

  • 光学和光子学 在光学和光子学.
  • 纳米技术 纳米技术
  • 材料科学 材料科学 材料科学

背景情况:

  • 光学系统的大小受到组件体积和光学路径长度的限制.
  • 地表平面光学和折叠光学提供了小型化潜力.
  • 设计高数值孔径的元表面,离轴可见光是具有挑战性的.

研究的目的:

  • 开发一种设计方法,以实现高效的非轴元格.
  • 为了克服特定应用的传统梯度元表面的局限性.
  • 为了使光学系统的小型化使用先进的平面光学.

主要方法:

  • 采用了低指数,低面比元评级的设计方法.
  • 专注于重定向和聚焦可见光 (532 nm).
  • 在高度离轴照明和高数值光圈下研究的性能.

主要成果:

  • 实现了离轴元格的近单元衍射效率.
  • 已证明可见光的有效重定向和聚焦.
  • 制造的光学元件具有110°的视角.

结论:

  • 开发的设计方法使得高效的离轴超表面光学成为可能.
  • 低指数,低面比结构适用于先进的超级分层应用.
  • 对于这些光学元件,通过纳米印记光刻技术进行可扩展的制造是可行的.