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関連する概念動画

Photoelectric Effect02:26

Photoelectric Effect

When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...
Dual Nature of Electromagnetic (EM) Radiation01:10

Dual Nature of Electromagnetic (EM) Radiation

Electromagnetic (EM) radiation consists of electric and magnetic field components oscillating in planes perpendicular to each other and mutually perpendicular to radiation propagation through space. EM radiation can be classified as a wave, characterized by the properties of waves such as wavelength (denoted as λ) and frequency (represented by ν).
Wavelength is the distance between two consecutive peaks (the highest point) or troughs (the lowest point) in the wave. Frequency is the number of...
Generating Electromagnetic Radiations01:10

Generating Electromagnetic Radiations

The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in the...
Electromagnetic Waves in Matter01:30

Electromagnetic Waves in Matter

Electromagnetic waves can travel in the vacuum as well as in matter. For example light, which is an electromagnetic wave, can travel through air, water, or glass.
Consider the electromagnetic wave passing through a dielectric medium. In such a case, Maxwell's equations get modified. In Ampere's law, ε0 , the dielectric permittivity of free space is replaced with ε, the permittivity of dielectric. Also, the vacuum permeability μ0 is replaced by the permeability of the medium, μ.
Furthermore, the...
Energy Carried By Electromagnetic Waves01:22

Energy Carried By Electromagnetic Waves

Anyone who has used a microwave oven knows there is energy in electromagnetic waves. Sometimes, this energy is obvious, such as in the summer sun's warmth. At other times, it is subtle, such as the unfelt energy of gamma rays, which can destroy living cells. Electromagnetic waves bring energy into a system through their electric and magnetic fields. These fields can exert forces and move charges in the system and, thus, do work on them. However, there is energy in an electromagnetic wave,...
Energy Associated With a Charge Distribution01:21

Energy Associated With a Charge Distribution

The work done to bring a charge through a distance r is given by the potential difference between the initial and the final position. To assemble a collection of point charges, the total work done can be expressed in terms of the product of each pair of charges divided by their separation distance, defined with respect to a suitable origin. Solving this expression gives the energy stored in a point charge distribution.

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関連する実験動画

Updated: Jul 9, 2026

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
12:19

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Published on: April 4, 2017

シリコンベースの量子カスケード構造からのサブバンド間電光発光.

G Dehlinger1, L Diehl, U Gennser

  • 1Laboratory for Micro- and Nanotechnology, Paul Scherrer Institut, CH-5232 Villigen, Switzerland. gabriel.dehlinger@psi.ch

Science (New York, N.Y.)
|January 11, 2000
PubMed
まとめ

研究者らは,シリコン/シリコン-ゲルマニウム量子カスケード構造におけるサブバンド間電解光を観測した. このブレークスルーにより,シリコンベースの技術におけるアクティブ光学コンポーネントを可能にし,既存のレーザーに匹敵する寿命を持つことができます.

さらに関連する動画

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F&#8722;
06:53

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−

Published on: July 27, 2018

関連する実験動画

Last Updated: Jul 9, 2026

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
12:19

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Published on: April 4, 2017

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F&#8722;
06:53

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−

Published on: July 27, 2018

科学分野:

  • 半導体物理学 半導体物理学
  • オプトエレクトロニクス (光電子機器)
  • マテリアルサイエンス 材料科学

背景:

  • 量子カスケードレーザー (QCL) は,半導体帯内の電子トランジションを利用します.
  • シリコン技術にアクティブ光学コンポーネントを統合することは大きな課題です.
  • QCLは,効率的な動作のために,狭いライン幅と長い上位状態の寿命を必要とします.

研究 の 目的:

  • p型シリコン/シリコン-ゲルマニウム量子カスケード構造におけるサブバンド間電光発光の観測を報告する.
  • QCLアプリケーションのためのシリコンベースの材料の可能性を調査する.
  • これらの新しい構造物のライン幅や寿命などの性能特性を評価する.

主な方法:

  • p型シリコン/シリコン-ゲルマニウム量子カスケード構造の製造.
  • 電気発光スペクトルと偏振を測定する.
  • 温度に依存する特徴は,最大180ケルビンまで.
  • 量子井戸設計に基づく非放射性寿命の分析.

主要な成果:

  • 観測されたサブバンド間の電光発光は,22 meVのライン幅で130 meVを中心とした.
  • 電気発光は予想される極化を示し,180 Kまで検出可能でした.
  • 非放射性の寿命は,量子井戸設計に強く依存していた.
  • 既定のGaInAs/AlInAsレーザー構造に匹敵する非放射性寿命を達成しました.

結論:

  • シリコン/シリコン-ゲルマニウム量子カスケード構造におけるサブバンド間電光発光の実現可能性を実証した.
  • 観測された特徴は,シリコンベースのアクティブ光学デバイスの可能性を示唆しています.
  • 量子井戸設計のさらなる最適化により,実用的なレーザーアプリケーションに適した寿命が得られます.