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相关概念视频

Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
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Ionic Crystal Structures02:42

Ionic Crystal Structures

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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
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Crystal Growth: Principles of Crystallization01:25

Crystal Growth: Principles of Crystallization

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Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent...
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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
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Negative Regulator Molecules01:23

Negative Regulator Molecules

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Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
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Positive, Negative, and Zero Work00:58

Positive, Negative, and Zero Work

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Work is done on an object when energy is transferred to the object. In other words, work is done when a force acts on a body that undergoes a displacement from one position to another. By definition, the work done by a force is the integral of the force with respect to the displacement along its path. Forces can vary as a function of position, and displacements can occur along various paths between two points. The magnitude of a force multiplied by the cosine of the angle that the force makes...
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相关实验视频

Updated: Jan 25, 2026

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

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通过光子时间晶体实现非互惠的负折射.

Mohammad R Tavakol1, Wenshan Cai1,2

  • 1School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States.

Nano letters
|January 23, 2026
PubMed
概括
此摘要是机器生成的。

我们使用时间变化的光子结构来证明非互惠的负折射. 这一突破使光束能够被隔离,同时保持负折射,为光学和微波设备开辟了新的可能性.

关键词:
超材料是什么?超材料是什么?有负折射的阴性折射.没有互惠的非互惠.光子时间晶体时间调制的时间调制.

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Fabrication of 1-D Photonic Crystal Cavity on a Nanofiber Using Femtosecond Laser-induced Ablation
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Utilization of Plasmonic and Photonic Crystal Nanostructures for Enhanced Micro- and Nanoparticle Manipulation
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相关实验视频

Last Updated: Jan 25, 2026

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Utilization of Plasmonic and Photonic Crystal Nanostructures for Enhanced Micro- and Nanoparticle Manipulation
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科学领域:

  • 光子学和元材料研究
  • 电磁和波浪现象 电磁和波浪现象

背景情况:

  • 负折射是元材料中的一个关键现象,但实现非互惠性 (定向控制) 是一个挑战.
  • 时间变化的光子结构提供了一种新的途径,可以打破时间逆向对称性,并实现非互惠的效应.

研究的目的:

  • 理论上证明非互惠的负折射使用工程时间变化的光子结构.
  • 为光学和微波频率系统开发实用设计.

主要方法:

  • 在超波媒介的接口上进行工程时间调制.
  • 设计多层高压板块 (光学) 和时间调节的超表面 (微波).
  • 使用Floquet和扩展和一个和平衡有限元解法器进行验证.

主要成果:

  • 在保持负折射的同时,在前向和后向光束之间实现了隔离.
  • 在光学装置中报告的隔离>46 dB,在微波装置中报告的隔离>11 dB.
  • 通过理论分析和数值模拟验证了拟议的设计.

结论:

  • 介绍了跨不同频率模式的非相互负折射的一般框架.
  • 扩大了时间变化的超表面和光子时间晶体的设计空间.
  • 证明了用于先进光学和微波应用的时间变化的结构的潜力.