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相关概念视频

Integrator and Differentiator01:13

Integrator and Differentiator

745
Op-amp circuits have significant applications in various fields, including automotive engineering. One such application is cruise control systems in cars, where op-amp circuits are integral for maintaining a constant speed. In these systems, op-amps function as both integrators and differentiators.
An integrator within an op-amp circuit produces an output directly proportional to the integral of the input signal. This is achieved by replacing the feedback resistor in a typical inverting...
745
Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

185
Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
185
Clipper Circuit01:18

Clipper Circuit

331
A clipper circuit is a fundamental wave-shaping device that harnesses the unique properties of diodes to alter and control waveform characteristics. This technology is widely used in electronic devices, especially in television and radar communication systems, where it enhances waveform modulation in both transmitters and receivers.
The operation of a clipper circuit can be exemplified by analyzing a dual-clipper configuration setup that integrates two ideal diodes, each paired with a biasing...
331
Second Derivatives and Laplace Operator01:22

Second Derivatives and Laplace Operator

1.2K
The first order operators using the del operator include the gradient, divergence and curl. Certain combinations of first order operators on a scalar or vector function yield second order expressions. Second-order expressions play a very important role in mathematics and physics. Some second order expressions include the divergence and curl of a gradient function, the divergence and curl of a curl function, and the gradient of a divergence function.
Consider a scalar function. The curl of its...
1.2K
Transmission-Line Differential Equations01:26

Transmission-Line Differential Equations

204
Transmission lines are essential components of electrical power systems. They are characterized by the distributed nature of resistance (R), inductance (L), and capacitance (C) per unit length. To analyze these lines, differential equations are employed to model the variations in voltage and current along the line.
Line Section Model
A circuit representing a line section of length Δx helps in understanding the transmission line parameters. The voltage V(x) and current i(x) are measured...
204
Voltage Doubler Circuit01:23

Voltage Doubler Circuit

439
A voltage doubler circuit integrates two main components: a clamping section and a rectifier section. The clamping section consists of a capacitor (C1) and a diode (D1), whereas the rectifier section is equipped with another diode (D2) and capacitor (C2). This circuit produces an output voltage with twice the amplitude of the sinusoidal input voltage.
439

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相关实验视频

Updated: May 23, 2025

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
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超表面启用了高阶差异化器.

Xiaodong Qiu1, Jingcheng Zhang1, Yubin Fan1

  • 1Department of Electrical Engineering, City University of Hong Kong, Kowloon, Hong Kong SAR, China.

Nature communications
|March 12, 2025
PubMed
概括
此摘要是机器生成的。

研究人员开发了用于任意顺序光学差异化的超表面设备,使先进的图像处理和光学超分辨率成为可能. 这一突破为半导体制造提供了精确的距离估计.

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Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
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The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
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相关实验视频

Last Updated: May 23, 2025

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
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Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

Published on: June 7, 2019

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Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
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The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
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科学领域:

  • 光学和光子学 在光学和光子学.
  • 材料科学 材料科学 材料科学
  • 图像处理 图像处理

背景情况:

  • 基于metasurface的光学模拟差异化提供了并行操作,紧性和低功耗.
  • 以前的研究主要集中在一级和二级差异化上,对可扩展的,多级的,现实空间高级差异化的有限探索.
  • 对于任意顺序差异化的实际应用和系统构造仍未得到充分探索.

研究的目的:

  • 理论上为Pancharatnam-Berry相位元表面提出通用相位梯度函数,使任意顺序的光学分化成为可能.
  • 通过实验证明强度和相位图像的高阶光学差异化.
  • 为了利用空间差异化进行光学超分辨率和精确的距离估计.

主要方法:

  • 基于富里埃变换属性的通用相梯度函数的理论设计.
  • 制造潘查拉特纳姆-贝里相元表面.
  • 实验实现第五阶光学差异化和超分辨率成像.

主要成果:

  • 使用地表设备展示了任意顺序的光学差异化能力.
  • 通过实验实现了强度和相位图像的第五阶光学差异化.
  • 成功实施了光学超分辨率方案,以高精度估计不连贯点源之间的距离 (在雷利距离的0.015以内).

结论:

  • 拟议的超表面设计为任意顺序的光学差异化提供了一个多功能工具包.
  • 这项技术使先进的图像处理,显微镜和光学超分辨率成为可能.
  • 这些发现为半导体纳米制造的高精度光学对齐提供了潜在的应用.