Mesoscopic correlation with polarization rotation of electromagnetic waves

Area of Science:

• Physics
• Wave Phenomena
• Condensed Matter Physics

Background:

• Mesoscopic correlations in wave propagation through disordered media are complex.
• Understanding the components of intensity correlation functions is crucial for characterizing wave transport.
• Previous studies have explored universal conductance fluctuations but lacked detailed component analysis.

Purpose of the Study:

• To investigate mesoscopic correlations in the polarization of microwave radiation transmitted through a random waveguide.
• To decompose the intensity correlation function of a vector wave into distinct range components.
• To experimentally measure and theoretically validate infinite range correlations leading to universal conductance fluctuations.

Main Methods:

• Experimental measurement of microwave radiation polarization transmitted through a random waveguide.
• Application of diagrammatic theory to analyze the intensity correlation function.
• Decomposition of the correlation function into short, long, and infinite range components.

Main Results:

• Mesoscopic correlations in polarization were observed.
• The intensity correlation function was unambiguously decomposed.
• Infinite range correlation, responsible for universal conductance fluctuations, was measured and agreed with theoretical calculations.
• Nonuniversal, frequency-independent terms associated with sample coupling were identified in the long and infinite range components.

Conclusions:

• The study successfully demonstrates the decomposition of vector wave intensity correlation functions.
• Experimental results for universal conductance fluctuations align with theoretical predictions.
• The findings highlight the presence of nonuniversal coupling effects influencing wave transport in random waveguides.