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関連する概念動画

Integrals of Powers of Sine and Cosine01:29

Integrals of Powers of Sine and Cosine

55
Trigonometric integrals involve the integration of expressions containing powers of sine, cosine, and related functions. They are common in calculus problems and have applications in physics and engineering. The method for integrating expressions of the form sinm(x)cosn(x) depends on whether the exponents are odd or even.If the power of sine is odd, one sine factor is separated from the integrand, leaving an even power of sine. The remaining sine terms are rewritten in terms of cosine using the...
55
Integrals of Powers of Secant and Tangent01:18

Integrals of Powers of Secant and Tangent

63
Integrals involving powers of tangent and secant are commonly evaluated using substitution, with the strategy determined by the parity of the exponents. The method relies on pairing part of the integrand with the derivative of a suitable trigonometric function and rewriting the remaining factors using trigonometric identities.When the power of secant is even, tangent is chosen as the substitution variable. Since the derivative of tangent is secant squared, a factor of sec⁡2x can be...
63
Harmonic Mean01:09

Harmonic Mean

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The arithmetic mean is usually skewed towards the larger values in the data set. Therefore, to avoid this inherent bias towards smaller values, the harmonic mean is used.
Take the example of the speed of a car, which is the measure of the rate of distance traveled. If the vehicle traverses the same distance back-and-forth, its average speed equals the total distance traveled divided by the total time taken. However, if the car moves with varying speeds, then the arithmetic mean is more skewed...
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Resonance02:52

Resonance

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The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N-O and N=O bonds.
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Simple Harmonic Motion01:21

Simple Harmonic Motion

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Simple harmonic motion is the name given to oscillatory motion for a system where the net force can be described by Hooke's law. If the net force can be described by Hooke's law and there is no damping (by friction or other non-conservative forces), then a simple harmonic oscillator will oscillate with equal displacement on either side of the equilibrium position. To derive an equation for period and frequency, the equation of motion is used. The period of a simple harmonic oscillator is given...
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Energy in Simple Harmonic Motion01:23

Energy in Simple Harmonic Motion

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To determine the energy of a simple harmonic oscillator, consider all the forms of energy it can have during its simple harmonic motion. According to Hooke's Law, the energy stored during the compression/stretching of a string in a simple harmonic oscillator is potential energy. As the simple harmonic oscillator has no dissipative forces, it also possesses kinetic energy. In the presence of conservative forces, both energies can interconvert during oscillation, but the total energy remains...
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Updated: Jan 30, 2026

Harmonic Nanoparticles for Regenerative Research
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Harmonic Nanoparticles for Regenerative Research

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第二ハーモニク共振による低電力統合光学増幅.

Devin J Dean1, Taewon Park1,2, Hubert S Stokowski1

  • 1Department of Applied Physics and Ginzton Laboratory, Stanford University, Stanford, CA, USA.

Nature
|January 28, 2026
PubMed
まとめ
この要約は機械生成です。

私たちは,薄膜リチウムニオバートで低電力統合光学パラメトリックアンプ (OPA) を開発し,最小の入力電力で高増益を達成しました. このブレークスルーにより,高度な量子および古典フォトニクスのアプリケーションのための実用的なオンチップOPAが可能になります.

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Last Updated: Jan 30, 2026

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Label-free Single Molecule Detection Using Microtoroid Optical Resonators
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科学分野:

  • フォトニクスと光学工学
  • 量子情報科学とは,量子情報科学である.
  • マテリアルサイエンス 材料科学

背景:

  • 光学増幅器は,通信,センシング,量子処理に不可欠です.
  • エルビウムドーピングや半導体増幅器などの既存の技術は,波長のカバー,ノイズ,歪みなどに制限があります.
  • 光学パラメータ増幅器 (OPA) は,ブロードバンド,量子限定の増幅を提供するが,高い電力を必要とし,小型化を阻害する.

研究 の 目的:

  • 薄膜リチウムニオバートプラットフォームに統合された小型化された低電力光学パラメトリックアンプ (OPA) を実証するために.
  • OPAの実用的な展開を制限している高出力要件を克服するために.
  • 次世代フォトニックアプリケーションの入力電力を大幅に削減して高増益とブロードバンド増幅を実現します.

主な方法:

  • 薄膜リチウムニオバートで第2ハーモニック共振器を統合したOPA設計を開発しました.
  • ポンプの再循環を利用して,ポンプの発電効率 (95%変換) と電力利用率を向上させました.
  • バンド幅を犠牲にすることなく,ポンプの電力とマルチプレックス信号とポンプを効果的に増加させるため,共振アーキテクチャを実装しました.

主要な成果:

  • <200mWの入力電力で>17dBの増幅を達成し,以前のOPAよりも数桁の改善となりました.
  • 110nm帯域幅の平坦で,ほぼ量子的に制限されたノイズ性能が実証されています.
  • 共鳴設計は,単通路設計と比較して,ポンプの電力をほぼ数量で効果的に増加させました.

結論:

  • 薄膜リチウムニオバートの低電力統合OPAが実証され,以前の電力制限を克服しました.
  • この技術により,チップ上のOPAが実用化され,量子フォトニクスと古典フォトニクスの進歩への道が開かれる.
  • 共振設計は,多様な光子アプリケーションに適したブロードバンド,低騒音の特性を有する効率的な増幅を提供します.