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Related Experiment Video

Updated: Jan 10, 2026

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

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Time-Domain Quantum Cascade Laser-Based Vibrational Circular Dichroism Spectroscopy with Linear Dichroism Monitoring.

Ruo-Jing Ho^1,2, Kevin Yeh¹, Rohit Bhargava^1,2,3,4

¹Beckman Institute for Advanced Science and Technology, University of Illinois Urbana-Champaign, Urbana, Illinois 61801, United States.

Analytical Chemistry

|November 24, 2025

Summary

This study introduces digitally referenced detection (DRD) to improve vibrational circular dichroism (VCD) measurements using quantum cascade lasers (QCLs). The new method enhances signal-to-noise ratio and detects polarization artifacts for more accurate chiral molecule analysis.

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Area of Science:

Spectroscopy
Chiroptical techniques
Molecular biophysics

Background:

Vibrational circular dichroism (VCD) provides molecular-level structural insights by measuring differential light absorption.
Quantum cascade lasers (QCLs) offer potential for advanced VCD instrumentation.
Weak VCD signals, laser fluctuations, and polarization artifacts complicate QCL-based VCD measurements.

Purpose of the Study:

To develop a novel detection method for high-signal-to-noise ratio (SNR) VCD measurements.
To enable real-time detection of polarization artifacts (linear dichroism and linear birefringence) in VCD.
To improve the accuracy of structural analysis for chiral biomolecules and materials.

Main Methods:

Implementation of digitally referenced detection (DRD) for per-pulse noise reduction in time-domain VCD acquisition.
Utilizing purely circularly polarized pulse pairs to minimize polarization artifacts.
Simultaneous extraction of linear dichroism (LD) signals within the VCD measurement cycle.

Main Results:

Achieved a 4-fold improvement in spectral signal-to-noise ratio (SNR) compared to conventional lock-in amplifier (LIA) methods, normalized for acquisition time and spectral bandwidth.
Demonstrated real-time monitoring of molecular orientation via simultaneous LD signal extraction.
Validated artifact detection capabilities using polymer films with induced linear dichroism/linear birefringence (LDLB) effects.

Conclusions:

Digitally referenced detection (DRD) provides a robust framework for high-SNR, real-time VCD measurements.
The method effectively detects and mitigates polarization artifacts (LDLB), enhancing analytical accuracy.
Paves the way for advanced applications in solid-state VCD and chirality imaging of complex systems.