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Metasurface-Enhanced Momentum-Resolved Circular Dichroism Spectroscopy.

Remi Sydelle Dado¹, Priyanuj Bordoloi², Yanyu Xiong²

¹Department of Chemistry, Stanford University, 33 Campus Drive, Stanford, California 94305, United States.

|May 14, 2026

Summary

This summary is machine-generated.

This study introduces a new method using achiral nanodisks to enhance and measure molecular circular dichroism (CD) signals. It effectively separates molecular CD from artifact signals for precise chirality detection.

Keywords:

Chirality Circular Dichroism Light−Matter Interaction Metasurfaces Optical Chirality

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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

Published on: November 21, 2019

Area of Science:

Nanophotonics
Chiroptics
Spectroscopy

Background:

Nanophotonic resonators can amplify weak molecular circular dichroism (CD) signals.
Structural chirality can interfere with accurate CD measurements.

Purpose of the Study:

To develop an artifact-free method for chiroptical enhancement and measurement.
To enable sensitive detection of molecular chirality and enantiomeric purity.

Main Methods:

Developed an achiral nanodisk array and angle-resolved spectral measurement approach.
Utilized circular polarization-resolved momentum-space spectroscopy.
Designed silicon nitride nanodisks for enhanced optical chirality.

Main Results:

Successfully deconvoluted molecular and substrate signals, enabling artifact-free enhancement.
Achieved a simulated ~150-fold enhancement in optical chirality density.
Validated enhancement of low concentration and enantiomeric excess (ee) CD signals (down to 0.1 mM and 1-25% ee).

Conclusions:

Momentum-resolved, metasurface-enhanced CD spectroscopy offers a reliable path for sensitive molecular chirality detection.
The developed approach allows for accurate assessment of enantiomeric purity.