Plasmonically Enhanced Enantioselective Nanocolorimetry.

Area of Science:

• Plasmonics
• Chiroptical spectroscopy
• Nanophotonics

Background:

• Chiral molecules exhibit distinct spatial arrangements, crucial in pharmaceuticals and biology.
• Existing methods for chiral molecule detection can be slow, complex, or lack sensitivity.
• Plasmonic nanostructures offer unique light-matter interaction properties for sensing applications.

Purpose of the Study:

• To generate a super- and homochiral light field.
• To develop a sensitive and rapid method for chiral molecule discrimination using nanocolorimetry.
• To demonstrate a self-referenced technique for identifying molecular handedness.

Main Methods:

• Utilizing plasmonic nanostructure dimers to twist linearly polarized light.
• Enhancing the excitation of molecular chiral polarizability within the plasmonic gap.
• Employing a chromaticity shift for detecting the handedness of chiral molecules.

Main Results:

• Successful generation of a super- and homochiral field.
• Demonstration of enhanced asymmetry in exciting molecular chiral polarizability.
• Achieved sensitive, fast, and self-referenced nanocolorimetry for chiral discrimination.
• Single-scan capability surpassing existing methods.

Conclusions:

• Plasmonic nanostructures can generate tailored chiral fields for molecular sensing.
• Nanocolorimetry based on chromaticity shifts provides an efficient route for chiral molecule identification.
• The developed method offers significant advantages in speed, sensitivity, and simplicity over conventional techniques.