Resolving transitions in the mesoscale domain configuration in VO2 using laser speckle pattern analysis

Area of Science:

• Materials Science
• Condensed Matter Physics

Background:

• Coexisting mesoscopic domains with contrasting properties are key for novel material functionalities.
• Current methods for mapping domain structure lack either real-time information or mesoscale spatial resolution.

Purpose of the Study:

• To develop an experimental technique bridging local and global methods for mesoscale domain analysis.
• To provide faster, spatially resolved, real-time information on domain formation and evolution.

Main Methods:

• Analysis of laser speckle patterns during the first-order phase transition of Vanadium Dioxide (VO2).
• Development of a technique offering mesoscale spatial and temporal resolution.

Main Results:

• Demonstrated an elegant experimental technique providing mesoscale information on domain formation and evolution.
• Achieved time scales orders of magnitude faster than current spatially resolved approaches.
• The method is straightforward to analyze.

Conclusions:

• The developed technique offers a powerful approach for studying phase separation in complex materials.
• The method can be generalized to other systems exhibiting large-scale phase separation.
• Provides both spatial and temporal resolution for mesoscale domain evolution.