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関連する概念動画

Interference and Diffraction02:18

Interference and Diffraction

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Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
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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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Passive Diffusion: Overview and Kinetics01:17

Passive Diffusion: Overview and Kinetics

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Passive diffusion is a critical process that allows small lipophilic drugs to cross the cell membrane along a concentration gradient. This mechanism's efficiency depends on four primary factors: the membrane's surface area, the drug's lipid-water partition coefficient, the concentration gradient, and the membrane's thickness.
When administered orally, drugs establish a substantial concentration gradient between the gastrointestinal (GI) lumen and the bloodstream, expediting...
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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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The de Broglie Wavelength02:32

The de Broglie Wavelength

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In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
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Echo01:06

Echo

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The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
Imagine the sound is reflected back to the ears. Assuming that the source is very close to the human, the difference between hearing the two sounds—the emitted sound and the reflected sound—may be more than the minimum time for perceiving distinct sounds. If this is the case,...
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関連する実験動画

Updated: Apr 28, 2026

Digital Inline Holographic Microscopy DIHM of Weakly-scattering Subjects
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Digital Inline Holographic Microscopy DIHM of Weakly-scattering Subjects

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メタマテリアル. 拡散光散乱媒質で目に見えない状態を覆う.

Robert Schittny1, Muamer Kadic2, Tiemo Bückmann1

  • 1Institute of Applied Physics, Karlsruhe Institute of Technology (KIT), D-76128 Karlsruhe, Germany. Deutsche Forschungsgemeinschaft (DFG)-Center for Functional Nanostructures (CFN), KIT, D-76128 Karlsruhe, Germany.

Science (New York, N.Y.)
|June 7, 2014
PubMed
まとめ

この研究は,拡散環境で動作し,以前の物理的制約を克服する実用的な不可視化マントを実証しています. これらのマントは,単に屈折ではなく,光の散乱を操作することによって,物体を効果的に隠します.

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Agarose-based Tissue Mimicking Optical Phantoms for Diffuse Reflectance Spectroscopy
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Scattering And Absorption of Light in Planetary Regoliths
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Scattering And Absorption of Light in Planetary Regoliths

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Scattering And Absorption of Light in Planetary Regoliths
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科学分野:

  • オプティクスは光学です.
  • マテリアルサイエンス 材料科学
  • 物理 物理学 物理学とは

背景:

  • マクスウェルの方程式に基づいた伝統的な見えないマントは,マクロスコープ,ブロードバンド,そして全方向的なアプリケーションの物理的な制限に直面しています.
  • この研究は,弾道光の伝播を超えた代替物理原理を探求しています.

研究 の 目的:

  • 多重光散乱が特徴となる環境において,目に見えないマントの実現可能性を調査する.
  • ブロードバンド,パッシブ,オムニディレクショナル・インビジビリティ・コートを設計・製造する.

主な方法:

  • 光散乱環境におけるフィックの拡散方程式に基づく理論的探求.
  • ポリデメチルシロキサン殻を用い,メラミン樹脂微粒子を添加した円筒形および球形のマントの製造.
  • 水ベースの拡散媒介でカオカージング性能の実験試験.

主要な成果:

  • 拡散した環境で成功裏に隠蔽することが実証され,弾道媒体の制限に矛盾しています.
  • 全可視スペクトルで良好な隠蔽性能を達成しました.
  • すべての照明条件およびインシデントの偏振に対して有効性が確認されています.

結論:

  • 隠蔽は複数の光散乱環境でも実現可能であり,従来の光学を超えて可能性を広げています.
  • 開発されたマイクロ粒子のドーピングされたポリマーシェルは,実用的な拡散可視化マントを作成するための実行可能な方法を提供します.
  • この研究は,分散媒介における隠蔽技術の新たな道を開きます.