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関連する概念動画

Propagation of Waves01:07

Propagation of Waves

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When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
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Boundary Conditions: Lossless Lines01:21

Boundary Conditions: Lossless Lines

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Consider a single-phase, two-wire, lossless transmission line terminated by an impedance at the receiving end and a source with Thevenin voltage and impedance at the sending end. The line, with length, has a surge impedance and wave velocity determined by the line's inductance and capacitance.
At the receiving end, the boundary condition states that the voltage equals the product of the receiving-end impedance and current. This relationship is expressed as a function of the incident and...
152
Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview

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Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
The ATR process begins by directing a beam...
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Reflection of Waves01:07

Reflection of Waves

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When a wave travels from one medium to another, it gets reflected at the boundary of the second medium. A common example of this is when a person yells at a distance from a cliff and hears the echo of their voice. The sound waves (longitudinal waves) traveling in the air are reflected from the bounding cliff. Similarly, flipping one end of a string whose other end is tied to a wall causes a pulse (transverse wave) to travel through the string, which gets reflected upon reaching the wall. In...
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Total Internal Reflection Fluorescence Microscopy01:05

Total Internal Reflection Fluorescence Microscopy

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Total internal reflection fluorescence microscopy or TIRF is an advanced microscopic technique used to visualize fluorophores in samples close to a solid surface with a higher refractive index, such as a glass coverslip. TIRF only allows fluorophores in proximity to the solid surface to be excited. When light from a medium with a lower refractive index (such as air) hits the glass coverslip at a critical angle, the light undergoes total internal reflection stead of passing through the glass.
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Imaging Biological Samples with Optical Microscopy01:18

Imaging Biological Samples with Optical Microscopy

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Optical microscopy uses optic principles to provide detailed images of samples. Antonie van Leeuwenhoek designed the first compound optical microscope in the 17th century to visualize blood cells, bacteria, and yeast cells. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes with enhanced magnification and resolution.
In optical microscopy, the specimen to be viewed is placed on a glass slide and clipped on the stage...
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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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複合的なメディアを通して完璧な伝送のための反射構造

Michael Horodynski1, Matthias Kühmayer1, Clément Ferise2

  • 1Institute for Theoretical Physics, Vienna University of Technology (TU Wien), Vienna, Austria.

Nature
|July 13, 2022
PubMed
まとめ

研究者たちは 補完的な媒体を用いて 透明な材料を作る方法を開発しました この技術により,光波は無秩序な介質を通過し,さまざまなアプリケーションで分散の制限を克服できます.

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Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials
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Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials
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科学分野:

  • 波の物理
  • 混乱したメディア
  • 光学について

背景:

  • 無秩序なメディアでの波散は 電気通信や生物医学イメージングなどのアプリケーションを制限します
  • 波長の形成は散乱を減らすことができますが,稀な開いた伝送チャネルに依存しています.
  • 現存する方法は,任意のインシデント光場に対して完璧な伝送を達成することはできません.

研究 の 目的:

  • すべてのインデント光波に対して,不透明な無秩序なメディアを半透明にする.
  • 波の伝播のための開かれた伝送エイゲンチャネルの不足を克服する.
  • 複雑な分散環境を通して効率的な波の伝送を可能にします.

主な方法:

  • 無秩序な媒体の前に置かれた 補完的な媒体を利用する
  • 2つのメディア表面の反射マトリックス間のクリティカルカップリングのマトリックス一般化を満たす.
  • 電子磁気波導体のプロトコルを数値的に実験的に実装する.

主要な成果:

  • 無秩序な媒体は,補完的な媒介とペアリングされたとき,すべての受信光波に半透明になることを示した.
  • 複数の分散要素を備えた電磁波導管を成功裏に設計した.
  • 半透明な散乱媒体は,発生放射線を長期間保存することが観察されました.

結論:

  • 新しい方法により,不透明な無秩序なメディアを半透明に変換できます.
  • この技術は波の散乱や 伝送チャネルの不足によってもたらされる 制限を克服します
  • 開発された半透明な分散媒体は波制御と放射線貯蔵の可能性を秘めています.