Time development of a persistent hole burning in multiple-scattering media

Area of Science:

• Optics
• Materials Science
• Physical Chemistry

Background:

• Persistent hole burning is a technique used to probe spectral properties of materials.
• Understanding light propagation and photoreaction in scattering media is crucial for various optical applications.

Purpose of the Study:

• To investigate the time evolution of persistent hole burning in photoreactive and multiple-scattering media.
• To analyze the relationship between speckle pattern statistics and hole burning dynamics.
• To characterize hole shape, width, and depth over time.

Main Methods:

• Utilized a writing laser beam to induce photoreaction and recode the volume speckle pattern.
• Employed a reading beam to measure luminescence intensity as a function of frequency or wave vector difference.
• Examined three types of samples with varying geometric configurations and photoreactive processes.
• Conducted experiments using a spiropyran derivative photochromic dye.

Main Results:

• Observed time development reflecting the statistics of intensity fluctuations in the speckle pattern.
• Determined a maximum hole depth of approximately 0.26.
• Characterized distinct hole shapes, widths, and depths for different sample types and photoreactive processes.
• Demonstrated good agreement between experimental results and theoretical predictions.

Conclusions:

• The study elucidates the dynamics of persistent hole burning in complex optical media.
• Time-resolved hole burning provides a method to study intensity fluctuation statistics in scattering media.
• The findings are consistent with theoretical models and validated using photochromic dyes.