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Polarimetry finds application in chemical kinetics to measure the concentration and reaction kinetics of optically active substances during a chemical reaction. Optically active substances have the capability of rotating the plane of polarization of linearly polarized light passing through them—a feature called optical rotation. Optical activity is attributed to the molecular structure of substances. Normal monochromatic light is unpolarized and possesses oscillations of the electrical field in...

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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser

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Four-channel polarimeter for time-resolved ellipsometry.

|September 11, 2009

Summary

A novel four-channel partial polarimeter enables high-speed, time-resolved ellipsometry. This instrument determines key polarization states with no moving parts, achieving ~1 psec resolution for advanced optical measurements.

Area of Science:

Optical Physics
Materials Science
Spectroscopy

Background:

Ellipsometry is a powerful technique for characterizing material optical properties.
Traditional ellipsometry often faces limitations in temporal resolution.
Time-resolved measurements are crucial for studying dynamic processes in materials.

Purpose of the Study:

To design and demonstrate a novel four-channel partial polarimeter.
To enable high time-resolution measurements in ellipsometry.
To determine intensity and reduced Stokes vector elements efficiently.

Main Methods:

A four-channel partial polarimeter was designed using a beam splitter.
The device generates four parallel output beams from a single input beam.

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Intensity detection and digitization of output beams were performed.

Main Results:

The polarimeter successfully determined intensity and two reduced Stokes vector elements.
The absence of moving parts allows for time resolution limited by detectors (~1 psec).
The device is achromatic, functioning from 220 to 1100 nm.

Conclusions:

The developed polarimeter significantly enhances time-resolved ellipsometry capabilities.
Its design is suitable for streak-camera detection, offering picosecond resolution.
This instrument advances the study of ultrafast optical phenomena and dynamic material responses.