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Crystal Growth: Principles of Crystallization01:25

Crystal Growth: Principles of Crystallization

Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent – the...

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Fabrication of Zero Mode Waveguides for High Concentration Single Molecule Microscopy
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Light propagation within colloidal crystal wire fabricated by a dewetting process.

Tadashi Mitsui1, Yutaka Wakayama, Tsunenobu Onodera

  • 1Quantum Dot Research Center, National Institute for Materials Science, Tsukuba, Japan. MITSUI.Tadashi@nims.go.jp

Nano Letters
|February 7, 2008
PubMed
Summary

We fabricated a colloidal crystal wire using a simple dewetting process. Light propagation within the wire is mainly due to nanojet-induced mode coupling and partly whispering-gallery mode coupling.

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Area of Science:

  • Materials Science
  • Optics
  • Nanotechnology

Background:

  • Colloidal crystals offer unique optical properties.
  • Controlling light propagation in nanostructures is crucial for optical devices.

Purpose of the Study:

  • To fabricate a colloidal crystal wire.
  • To investigate light propagation mechanisms within the wire.

Main Methods:

  • Fabrication of colloidal crystal wire via a dewetting process.
  • Near-field scanning optical microscopy for direct observation of light propagation.

Main Results:

  • Successful fabrication of a colloidal crystal wire from thousands of connected microspheres.
  • Direct observation of light propagation within the wire.
  • Identified nanojet-induced mode coupling as the primary mechanism for straight propagation.
  • Identified whispering-gallery mode coupling as a secondary mechanism.

Conclusions:

  • The study demonstrates a simple method for fabricating colloidal crystal wires.
  • The findings elucidate the light propagation mechanisms in such structures, important for photonic applications.