関連する実験動画
Updated: May 2, 2026

12:18
Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
Published on: August 5, 2013
16.4K
ビスタブルなナモメカニカルオシレータにおけるコヒーレント信号増幅は,ストキャスティック共振によるものです
Robert L Badzey1, Pritiraj Mohanty
1Department of Physics, Boston University, 590 Commonwealth Avenue, Boston, Massachusetts 02215, USA.
Nature
|October 14, 2005
まとめ
ストキャスティック共振,つまりノイズを用いた信号の増幅は,ナノスケールのシリコン振動器で観察されました. この発見は,高速ナノメカニカルメモリと量子研究につながる可能性がある.
科学分野:
- 物理 物理学 物理学とは
- ナノテクノロジー ナノテクノロジー
- マテリアルサイエンス 材料科学
背景:
- ストキャスティック共鳴は,騒々しいシステムの信号を放大し,以前はマクロスコープのシステムで観察されました.
- 信号増幅に不可欠なこの現象は,ナノスケールシステムでは実証されていない.
- 潜在的な応用には,自然現象の理解と新しい技術の開発が含まれます.
研究 の 目的:
- ナノスケールシステムにおけるストキャスティック共振を観察し,実証する.
- 信号増幅のためのナモメカニカルオシレータの可能性を調査する.
- ナノメカニカルメモリと量子現象のための新しい道を探求する.
主な方法:
- バイスタブルなナモメカニカルシリコン振動器 (クランプビーム) を使った.
- ラジオ周波数源を使って振動器を横振動に駆り立てました.
- システムにホワイトノイズを適用し,ラジオ周波数源を調節して状態間の切り替えを誘導しました.
主要な成果:
- ビスタブルなナモメカニカルシリコンオシレータでストキャスティック共振を成功裏に観測した.
- 白いノイズを加えると,信号の強度が大幅に増幅することが示されました.
- ナノメカニカルシステムにおける2つの安定状態間の制御可能なスイッチングが確認されました.
結論:
- ストキャスティック共鳴は,ナノメカニカルシステムで達成可能である.
- この観察は,高速なナモメカニカルメモリー・セルの可能性を広げている.
- これは,ナノスケールでのマクロスコーピック量子コヒーレンスとトンネリングの探索への道を開く.
関連する概念動画
Damped Oscillations
6.2K
In the real world, oscillations seldom follow true simple harmonic motion. A system that continues its motion indefinitely without losing its amplitude is termed undamped. However, friction of some sort usually dampens the motion, so it fades away or needs more force to continue. For example, a guitar string stops oscillating a few seconds after being plucked. Similarly, one must continually push a swing to keep a child swinging on a playground.
Although friction and other non-conservative...
Although friction and other non-conservative...
6.2K
Forced Oscillations
6.3K
When an oscillator is forced with a periodic driving force, the motion may seem chaotic. The motions of such oscillators are known as transients. After the transients die out, the oscillator reaches a steady state, where the motion is periodic, and the displacement is determined.
6.3K
Concept of Resonance and its Characteristics
5.4K
If a driven oscillator needs to resonate at a specific frequency, then very light damping is required. An example of light damping includes playing piano strings and many other musical instruments. Conversely, to achieve small-amplitude oscillations as in a car's suspension system, heavy damping is required. Heavy damping reduces the amplitude, but the tradeoff is that the system responds at more frequencies. Speed bumps and gravel roads prove that even a car's suspension system is not...
5.4K
Sound Waves: Resonance
2.8K
Resonance is produced depending on the boundary conditions imposed on a wave. Resonance can be produced in a string under tension with symmetrical boundary conditions (i.e., has a node at each end). A node is defined as a fixed point where the string does not move. The symmetrical boundary conditions result in some frequencies resonating and producing standing waves, while other frequencies interfere destructively. Sound waves can resonate in a hollow tube, and the frequencies of the sound...
2.8K
Amplifying Signals via Enzymatic Cascade
15.3K
When a ligand binds to a cell-surface receptor, the receptor's intracellular domain changes shape, which may either activate its enzyme function or allow its binding to other molecules. The initial signal is amplified by most signal transduction pathways. This means that a single ligand molecule can activate multiple molecules of a downstream target. Proteins that relay a signal are most commonly phosphorylated at one or more sites, activating or inactivating the protein. Kinases catalyze...
15.3K
Oscillations In An LC Circuit
2.7K
An idealized LC circuit of zero resistance can oscillate without any source of emf by shifting the energy stored in the circuit between the electric and magnetic fields. In such an LC circuit, if the capacitor contains a charge q before the switch is closed, then all the energy of the circuit is initially stored in the electric field of the capacitor. This energy is given by
2.7K

