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関連する概念動画

Perception of Sound Waves01:01

Perception of Sound Waves

4.8K
The human ear is not equally sensitive to all frequencies in the audible range. It may perceive sound waves with the same pressure but different frequencies as having different loudness. Moreover, the perception of sound waves depends on the health of an individual's ears, which decays with age. The health of one's ears may also be affected by regular exposure to loud noises.
The pitch of a sound depends on the frequency and the pressure amplitude of the source. Two sounds of the same...
4.8K
Speed of Sound in Solids and Liquids00:51

Speed of Sound in Solids and Liquids

3.3K
Most solids and liquids are incompressible—their densities remain constant throughout. In the presence of an external force, the molecules tend to restore to their original positions, which is only possible because the constituents interact. The interactions help the constituents pass on information about external disturbances, like sound waves. Therefore, sound waves travel faster through these media. Compared to solids, the constituents in a liquid are less tightly bound. Thus, sound...
3.3K
Bewley Lattice Diagram01:12

Bewley Lattice Diagram

935
The Bewley lattice diagram, developed by L. V. Bewley, effectively organizes the reflections occurring during transmission-line transients. It visually represents how voltage waves propagate and reflect within a transmission line, making it easier to understand the complex interactions that occur.
935
Echo01:06

Echo

644
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,...
644
Sound Waves: Interference00:53

Sound Waves: Interference

4.0K
Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...
4.0K
Standing Waves in a Cavity01:28

Standing Waves in a Cavity

1.1K
A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
1.1K

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Trapping of Micro Particles in Nanoplasmonic Optical Lattice
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Trapping of Micro Particles in Nanoplasmonic Optical Lattice

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音と光学格子

Yudan Guo1,2, Ronen M Kroeze1,2, Brendan P Marsh2,3

  • 1Department of Physics, Stanford University, Stanford, CA, USA.

Nature
|November 11, 2021
PubMed
まとめ

研究者はフォノンモードを持つ光学格子を作り,量子固体における弾性特性の研究を可能にしました. この新しいシステムは 量子溶融と 異様な欠陥の探査を可能にします

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Fabrication and Testing of Microfluidic Optomechanical Oscillators
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関連する実験動画

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Trapping of Micro Particles in Nanoplasmonic Optical Lattice
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Trapping of Micro Particles in Nanoplasmonic Optical Lattice

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Fabrication and Testing of Microfluidic Optomechanical Oscillators
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Fabrication and Testing of Microfluidic Optomechanical Oscillators

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Three-dimensional Optical-resolution Photoacoustic Microscopy
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科学分野:

  • 量子物理学
  • 凝縮物質物理学
  • 原子物理学

背景:

  • フォノン (量子化された音波) は結晶物質の特性にとって極めて重要です.
  • 伝統的な光学格子にはフォノンモードがなく,実際の固体をモデル化する能力を制限しています.
  • 既存の量子シミュレータは フォノンによって支配される 弾性や熱力学的振る舞いを 複製することはできません

研究 の 目的:

  • フォノンモードを表示する 光学網を設計する
  • 量子固体における弾性と集合刺激の物理を研究する
  • フォノンのイメージングと制御のための量子ガス顕微鏡を開発する.

主な方法:

  • ボーゼ-アインシュタインコンデンサートと コンフォカル光学共振器を組み合わせた
  • マルチモード・キャビティ・量子力学 (QED) システムを採用した.
  • フォノン分散関係を決定するために動的感受性測定を行った.

主要な成果:

  • アクティブフォノンモードの 光学格子を作りました
  • BEC-フォトンカップリングで調整可能な音速で観測されたフォノン分散関係.
  • 結晶化を引き起こし,フォノンをサポートする光子媒介の原子間相互作用を証明した.

結論:

  • この新しい光学格子システムは 量子弾力性を研究するためのプラットフォームを提供します
  • この発見により 量子溶融とフラクトニク欠陥の 探査の道が開かれています
  • 量子ガス顕微鏡はフォノンダイナミクスの詳細な調査を可能にします.