Broadband transient full-Stokes luminescence spectroscopy

Area of Science:

• Optics and Photonics
• Materials Science
• Spectroscopy

Background:

• Materials emitting circularly polarized light (CPL) are crucial for advanced technologies like displays and quantum information.
• Existing time-resolved CPL (TRCPL) techniques face limitations in sensitivity, timescale accessibility, and spectral information acquisition.
• These limitations hinder detailed photophysical understanding essential for materials development.

Purpose of the Study:

• To introduce a novel, high-sensitivity, broadband, full-Stokes spectroscopy setup for transient CPL characterization.
• To overcome the limitations of existing TRCPL methods.
• To enable the study of previously inaccessible material systems and photophysical processes.

Main Methods:

• Development of a high-sensitivity (noise ~10⁻⁴), broadband (400-900 nm), transient (ns-ms) spectroscopy setup.
• Implementation of full-Stokes measurements to capture both CPL and linear polarization components.
• Application of the setup to materials with low dissymmetry factors and complex luminescence dynamics.

Main Results:

• The new setup demonstrates superior sensitivity and broad wavelength coverage compared to previous TRCPL approaches.
• Successfully characterized materials with low dissymmetry factors (10⁻³) and luminescence spanning nanosecond to millisecond timescales.
• Enabled tracking of the temporal evolution of linear polarization, crucial for understanding and mitigating CPL artifacts.

Conclusions:

• The developed TRCPL spectroscopy represents a significant advancement, expanding the scope of CPL materials research.
• Provides unprecedented photophysical insights into challenging material systems.
• Facilitates the development of next-generation optical and quantum technologies through improved characterization.