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相关概念视频

Deflection of a Beam01:19

Deflection of a Beam

211
Accurately determining beam deflection and slope under various loading conditions in structural engineering is crucial for ensuring safety and structural integrity. Singularity functions offer a streamlined approach to analyzing beams, especially when multiple loading functions complicate the bending moment equation.
Singularity functions, described in an earlier lesson, are powerful mathematical tools that represent discontinuities within a function commonly encountered in structural loading...
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Prismatic Beams: Problem Solving01:15

Prismatic Beams: Problem Solving

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In the design of a supported timber beam subjected to a distributed load, both the beam's physical dimensions and the timber's characteristics, such as its grade and species, are critical. These factors determine the allowable stress values, which are crucial for calculating the necessary beam depth to ensure structural integrity and safety.
The design begins with analyzing the beam as a free body to identify moments and force balances, thereby determining support reactions. Next, the...
99
Generating Electromagnetic Radiations01:10

Generating Electromagnetic Radiations

2.5K
The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in...
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相关实验视频

Updated: May 17, 2025

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
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多功能超表面编码用于可见束生成,偏移和聚焦.

Run Tian1, Zhixiao Zhang1, Li Gao2,1

  • 1State Key Laboratory of Flexible Electronics (LoFE), Institute of Advanced Materials (IAM), School of Materials Science and Engineering, Nanjing University of Posts and Telecommunications, Nanjing, China.

Nanophotonics (Berlin, Germany)
|March 31, 2025
PubMed
概括

这项研究引入了一种新型的超表面,用于产生带有轨道角动量 (OAM) 的束. 该设计能够同时实现异常偏移和重定焦,增强光学通信和量子操纵.

关键词:
编码元地表面的代码.金属的 金属的多功能的多功能功能功能.轨道角运动量 轨道角运动量

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相关实验视频

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科学领域:

  • 光学和光子学 在光学和光子学.
  • 超材料是什么?超材料是什么?
  • 纳米技术 纳米技术

背景情况:

  • 旋转束携带轨道角动量 (OAM),具有独特的甜甜圈形强度和螺旋波面.
  • 应用包括光通信,纳米粒子操纵和量子信息.
  • 现有的束生成方法在效率,设计灵活性方面存在局限性,并且需要单独的偏移和重新定位组件.

研究的目的:

  • 提出一种新的超表面设计,用于高效的旋转束生成.
  • 使用单个元表面实现束的同时异常偏移和重定位.
  • 为了克服传统波束生成技术的局限性.

主要方法:

  • 提出了基于共振相的新型超表面设计,利用纳米半径变化进行2π相覆盖.
  • 该设计采用基于富里埃卷积和金属原理的叠加编码序列.
  • 在可见状态下进行了metasurface制造和表征.

主要成果:

  • 在可见光谱中实现了高效的波束生成.
  • 同时异常偏移和束重定位的成功演示.
  • 全合一的多功能超表面设计整合了光束生成,偏移和重新聚焦.

结论:

  • 拟议的共振相元表面为先进的旋转束操纵提供了一个多功能平台.
  • 这种综合方法为安全的光通信和量子操纵提供了新的技术途径.
  • 该设计克服了以前的局限性,为更紧和更高效的光学系统铺平了道路.