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Related Concept Videos

Phase Transitions02:31

Phase Transitions

Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to occupy...
Phase Transitions01:21

Phase Transitions

A phase transition is the process in which a substance changes from one state of matter to another, like from a solid to a liquid, liquid to gas, or vice versa, at a specific temperature and under given pressure conditions. This change is spontaneous and is affected by alterations in temperature and pressure. These parameters impact the strength of the forces between molecules (intermolecular forces) in the substance.During a phase transition, both the initial and final phases of the substance...
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Phase Transitions: Melting and Freezing

Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...

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Preparation of Liquid Crystal Networks for Macroscopic Oscillatory Motion Induced by Light
07:56

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Published on: September 20, 2017

Random lasing in blue phase liquid crystals.

Chun-Wei Chen1, Hung-Chang Jau, Chun-Ta Wang

  • 1Department of Photonics, National Sun Yat-Sen University, Kaohsiung, Taiwan.

Optics Express
|November 29, 2012
PubMed
Summary
This summary is machine-generated.

Random lasing was observed in blue-phase liquid crystals with laser dyes. Platelet size and temperature control lasing wavelengths, mode stability, and thresholds, offering tunable optical feedback.

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Area of Science:

  • Materials Science
  • Optics
  • Condensed Matter Physics

Background:

  • Blue-phase liquid crystals (BPCs) exhibit unique optical properties due to their complex helical structures.
  • Incorporating laser dyes into BPCs enables the study of light-matter interactions and potential lasing phenomena.
  • Polymer stabilization enhances the thermal stability and mechanical properties of BPCs.

Purpose of the Study:

  • To investigate random lasing actions in pure and polymer-stabilized blue-phase liquid crystals (BPCs).
  • To understand the role of disordered platelet texture and refractive index mismatch in providing optical feedback for lasing.
  • To explore the influence of temperature and material composition on lasing properties.

Main Methods:

  • Observation of random lasing in BPCs doped with laser dyes.
  • Analysis of optical feedback mechanisms, including scattering and interference from platelet textures.
  • Systematic investigation of the dependence of lasing characteristics on temperature and platelet size.

Main Results:

  • Random lasing was successfully achieved in both pure and polymer-stabilized BPCs.
  • Optical feedback for lasing arises from scattering, interference, and multiple scattering within the disordered platelet texture.
  • Coherent random lasing was observed in both ordered blue phase and isotropic liquid states of polymer-stabilized BPCs.
  • Lasing wavelengths and mode stability are tunable via platelet size, controlled by cooling rate.
  • Lasing thresholds and emission spectra are highly dependent on temperature, allowing for tuning.

Conclusions:

  • Blue-phase liquid crystals provide a viable platform for random lasing applications.
  • The observed lasing phenomena are strongly linked to the structural characteristics and temperature-dependent properties of BPCs.
  • Controlling material parameters like platelet size and temperature offers a method for tuning random lasing characteristics.