関連する実験動画
Updated: Jun 23, 2025

06:42
Generation and Coherent Control of Pulsed Quantum Frequency Combs
Published on: June 8, 2018
9.0K
トポロジカルな周波数の観測
Christopher J Flower1, Mahmoud Jalali Mehrabad1, Lida Xu1
1Joint Quantum Institute, National Institute of Standards and Technology, University of Maryland, College Park, MD, USA.
まとめ
研究者はリング共鳴器の格子を使って チップ上で新しいトポロジカル周波数を作りました この新しい方法は 格子縁に限られたを生成し ナノフォトニクスの新しい道を開きます
科学分野:
- 光学について
- トポロジック物理学
- 非線形光学
背景:
- オンチップの光学周波数は,通常,単環共振器を使用して生成されます.
- 既存の方法には限界があり,周波数のより広範なアプリケーションを制限しています.
- モードロックされたレーザーは以前,多くの周波数のアプリケーションに必要でした.
研究 の 目的:
- トポロジカルな周波数カムという 新しいクラスの周波数カムを 実験的に実証する
- トポロジカル・システムにおける非線形周波数の生成を研究する.
- リング共鳴器の二次元格子で生成されたを調査する
主な方法:
- 何百ものリング共鳴器の二次元格子を作る.
- 線形分散で製造に堅固なトポロジカル・エッジ状態の刺激.
- これらのトポロジカル・エッジ状態をポンプして 周波数を生成します
主要な成果:
- 集積された周波数コンブ発電の実証.
- 約40の縦方向に振動する複数のエッジステート共振の観測.
- 生成された周波数の格子縁の空間的閉じ込め.
結論:
- スケーラブルなナノフォトニックプラットフォームで トポロジカルな周波数カムを成功裏に生成した.
- 非線形周波数カム生成におけるトポロジック物理学の探索の可能性を強調する.
- 独自の特性を持つオンチップの周波数コンブ発電のための新しいプラットフォームを提供する.
関連する概念動画
Atomic Nuclei: Larmor Precession Frequency
1.3K
The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession,...
1.3K
Determination of Expected Frequency
2.2K
Suppose one wants to test independence between the two variables of a contingency table. The values in the table constitute the observed frequencies of the dataset. But how does one determine the expected frequency of the dataset? One of the important assumptions is that the two variables are independent, which means the variables do not influence each other. For independent variables, the statistical probability of any event involving both variables is calculated by multiplying the individual...
2.2K
Electromagnetic Waves
8.6K
James Clerk Maxwell formulated a single theory combining all the electric and magnetic effects scientists knew during that time, calling the phenomena his theory predicted “Electromagnetic waves”. He brought together all the work that had been done by brilliant physicists such as Oersted, Coulomb, Gauss, and Faraday and added his own insights to develop the overarching theory of electromagnetism. Maxwell’s equations, combined with the Lorentz force law, encompass all the laws...
8.6K
Standing Electromagnetic Waves
1.5K
Electromagnetic waves can be reflected; the surface of a conductor or a dielectric can act as a reflector. As electric and magnetic fields obey the superposition principle, so do electromagnetic waves. The superposition of an incident wave and a reflected electromagnetic wave produces a standing wave analogous to the standing waves created on a stretched string.
Suppose a sheet of a perfect conductor is placed in the yz-plane, and a linearly polarized electromagnetic wave traveling in the...
Suppose a sheet of a perfect conductor is placed in the yz-plane, and a linearly polarized electromagnetic wave traveling in the...
1.5K
Construction of Frequency Distribution
7.6K
A frequency distribution table can be constructed using the steps given below.
First, make a table with two columns—one with the title of the data that needs to be organized, and the other column for frequency. [Draw a third column for tally marks if needed]. Then, take a look at the items given in the data set and decide if an ungrouped frequency distribution table or a grouped frequency distribution table would be more suitable. If there are large sets of different values, then it is...
First, make a table with two columns—one with the title of the data that needs to be organized, and the other column for frequency. [Draw a third column for tally marks if needed]. Then, take a look at the items given in the data set and decide if an ungrouped frequency distribution table or a grouped frequency distribution table would be more suitable. If there are large sets of different values, then it is...
7.6K
Frequency Response of a Circuit
258
Inductive circuits present intriguing challenges in electrical engineering, particularly during the transition from the time domain to the frequency domain. This transformation involves converting inductors into impedances and utilizing phasor representation.
The transfer function is pivotal in characterizing how these circuits react to various frequencies, facilitating a profound understanding of their behavior. An essential parameter is the time constant, signifying the...
The transfer function is pivotal in characterizing how these circuits react to various frequencies, facilitating a profound understanding of their behavior. An essential parameter is the time constant, signifying the...
258

