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関連する概念動画

Confocal Fluorescence Microscopy01:16

Confocal Fluorescence Microscopy

Confocal microscopy is an advanced microscopic technique. The prime advantage of the confocal microscope over other microscopy techniques is its ability to block the out-of-focus light from the illuminated samples using pinholes. It is widely used with fluorescence optics to obtain high-resolution, sharp contrast images. Unlike optical microscopes, confocal microscopes use a focused beam of light laser to scan the entire sample surface at different z-planes. These microscopes are, therefore,...
The Electromagnetic Spectrum01:24

The Electromagnetic Spectrum

Electromagnetic waves are categorized according to their wavelengths and frequencies, giving the electromagnetic spectrum. These waves are classified as radio, infrared, ultraviolet, etc. Radio waves refer to electromagnetic radiation with wavelengths ranging from millimeters to kilometers. Radio waves are commonly used for audio communications (i.e., radios) and typically result from an alternating current in the wires of a broadcast antenna. They cover a broad wavelength range and are used...
Standing Waves in a Cavity01:28

Standing Waves in a Cavity

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:
Mass Analyzers: Overview01:13

Mass Analyzers: Overview

The mass analyzer is a crucial component of the mass spectrometer. In the ionization chamber, the vaporized sample is bombarded with a high-energy electron beam to generate a radical cation and further fragment into neutral molecules, radicals, and cations. A series of negatively charged accelerator plates accelerate the cations into the mass analyzer. The mass analyzer separates ions according to their mass-to-charge (m/z) ratios and then directs them to the detector. The common types of mass...
Mass Analyzers: Common Types01:19

Mass Analyzers: Common Types

The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over short distances...

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関連する実験動画

Updated: Jun 21, 2026

Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
07:39

Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons

Published on: July 21, 2018

プラズマレーザーは,深層のサブ波長スケールでのプラズマレーザーです.

Rupert F Oulton1, Volker J Sorger, Thomas Zentgraf

  • 1NSF Nanoscale Science and Engineering Centre, 3112 Etcheverry Hall, University of California, Berkeley, California 94720, USA.

Nature
|September 1, 2009
PubMed
まとめ

研究者らは,ナノメートルスケールのプラズモニックレーザーを開発し,光学モードを difraktion limit よりも100倍小さく達成しました. このブレークスルーでは,ハイブリッドのプラズモンの波導線を用いて,光物質の相互作用を強化し,先進技術における潜在的応用が可能となる.

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Monitoring Conformational Dynamics of Single Unmodified Proteins using Plasmonic Nanotweezers
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Monitoring Conformational Dynamics of Single Unmodified Proteins using Plasmonic Nanotweezers

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関連する実験動画

Last Updated: Jun 21, 2026

Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
07:39

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Published on: July 21, 2018

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科学分野:

  • 光学とフォトニック
  • マテリアルサイエンス 材料科学
  • ナノテクノロジー ナノテクノロジー

背景:

  • 従来のレーザーは屈折によって制限され,光学モードのサイズとデバイスの寸法は光学場の波長の半分に制限されます.
  • 偏光限界をはるかに超えて,ナノメートルスケールで一貫した光学場を生成する超コンパクトレーザーの実現は,依然として根本的な課題です.
  • 表面プラズモンは光の局所化を提供しますが,光学周波数でのオーム損失によって妨げられます.

研究 の 目的:

  • ナノメートルスケールのプラズモニックレーザーを実験的に実証する.
  • 超小型光学モードのプラズモニック構造におけるオームの損失を克服するために.
  • レーザー装置の寸法と光学モードの縮小を調査する.

主な方法:

  • 半導体ナノワイヤの硫化カドミウムと銀の表面からなるハイブリッドプラズモニック波導体を使用しています.
  • 損失を減らすために,波導体内の5nm厚さの絶縁ギャップを使用します.
  • 自発的な放出率とレージング行動を評価するために,放出寿命を測定します.

主要な成果:

  • ナノメートルスケールのプラズモニックレーザーを実証し,光学モードは difraktion limitより100倍小さい.
  • エクシトン自発放出率のブロードバンド強化を最大6倍まで観測した.
  • 値のないレージングと,プラズモニックモードの特性により横方向の寸法を縮小する能力を示した.

結論:

  • ハイブリッドプラズモンの波導体におけるオームの損失を最小限に抑えることで,ナノメートルスケールのプラズモンのレーザーを成功裏に実現しました.
  • 強化された自発的放射と値のないレージングは,ナノスケールでの効率的な光物質相互作用を示しています.
  • これらのプラズモンのレーザーは,アクティブフォトニック回路,バイオセンシング,量子情報技術の新たな可能性を開きます.