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関連する概念動画

Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

30.8K
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...
30.8K
Ionic Crystal Structures02:42

Ionic Crystal Structures

16.9K
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...
16.9K
Crystal Growth: Principles of Crystallization01:25

Crystal Growth: Principles of Crystallization

4.9K
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...
4.9K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

48.3K
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,...
48.3K
Negative Regulator Molecules01:23

Negative Regulator Molecules

38.3K
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.
38.3K
Positive, Negative, and Zero Work00:58

Positive, Negative, and Zero Work

22.1K
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...
22.1K

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Updated: Jan 25, 2026

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
11:08

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

Published on: November 30, 2012

19.5K

フォトニックタイム結晶によって可能になった非相反的負の屈折

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
まとめ
この要約は機械生成です。

時間変化するフォトニック構造を用いて非相反的負の屈折を実証した。これにより、負の屈折を維持しながら光ビームを分離することが可能になり、光学およびマイクロ波デバイスの新たな可能性が開かれる。

キーワード:
メタマテリアル負の屈折非相反性フォトニックタイム結晶時間変調

さらに関連する動画

Fabrication of 1-D Photonic Crystal Cavity on a Nanofiber Using Femtosecond Laser-induced Ablation
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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
09:29

Utilization of Plasmonic and Photonic Crystal Nanostructures for Enhanced Micro- and Nanoparticle Manipulation

Published on: September 27, 2011

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関連する実験動画

Last Updated: Jan 25, 2026

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
11:08

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

Published on: November 30, 2012

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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
09:29

Utilization of Plasmonic and Photonic Crystal Nanostructures for Enhanced Micro- and Nanoparticle Manipulation

Published on: September 27, 2011

12.6K

科学分野:

  • フォトニクスおよびメタマテリアル
  • 電磁気学および波動現象

背景:

  • 負の屈折はメタマテリアルにおける重要な現象であるが、非相反性（方向制御）の達成は困難であった。
  • 時間変化するフォトニック構造は、時間反転対称性を破り、非相反的効果を可能にするための新しい経路を提供する。

研究 の 目的:

  • 工学的に設計された時間変化するフォトニック構造を用いた非相反的負の屈折を理論的に実証すること。
  • 光学およびマイクロ波周波数領域の両方に対する実用的な設計を開発すること。

主な方法:

  • 双曲線媒質の界面における時間変調の設計。
  • 多層双曲線スラブ（光学）および時間変調メタサーフェス（マイクロ波）の設計。
  • 検証のためにフロケ調和展開および調和平衡有限要素ソルバーを利用した。

主要な成果:

  • 負の屈折を維持しながら、順方向ビームと逆方向ビーム間の分離を達成した。
  • 光学デバイスで46dB以上、マイクロ波デバイスで11dB以上の分離を報告した。
  • 理論的解析と数値シミュレーションによって提案された設計を検証した。

結論:

  • 異なる周波数領域にわたる非相反的負の屈折のための一般的なフレームワークを導入した。
  • 時間変化するメタサーフェスおよびフォトニックタイム結晶の設計空間を拡大した。
  • 高度な光学およびマイクロ波アプリケーションのための時間変化構造の可能性を実証した。