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

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Subnanometer Visualization of Spatially Varying Local Field Resonances that Drive Tip-Enhanced Optical Spectroscopy.

Chih-Feng Wang¹, Andrey V Krayev², Patrick Z El-Khoury¹

¹Physical Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 99352, United States.

|September 26, 2023

Summary

This study demonstrates sub-nanometer spatial resolution in nanoscale optical measurements using extinction-based spectral nanoimaging. This technique tracks plasmon resonances, advancing our understanding of light-matter interactions at the nanoscale.

Keywords:

Extinction Junction Plasmon Nano-imaging Nano-spectroscopy Plasmon Resonance

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Area of Science:

Nanoscale optics
Plasmonics
Light-matter interactions

Background:

Current understanding of nanoscale optical measurements relies heavily on numerical simulations.
Quantitative descriptions of light-matter interactions at the nanoscale are challenging due to the interplay of classical and quantum theories.
Ultrahigh spatial resolution measurements are sensitive to sub-nanometer optical field variations.

Purpose of the Study:

To address the challenges in quantitative descriptions of nanoscale light-matter interactions.
To demonstrate a novel experimental approach for achieving ultrahigh spatial resolution in optical measurements.
To track spatially varying plasmon resonances with high precision.

Main Methods:

Utilized extinction-based spectral nanoimaging experiments.
Achieved spatial resolution below 1 nanometer.
Performed hyperspectral measurements to track plasmon resonances.

Main Results:

Demonstrated <1 nm spatial resolution in hyperspectral extinction measurements.
Successfully tracked spatially varying plasmon resonances.
Provided experimental validation for nanoscale optical field variations.

Conclusions:

Extinction-based spectral nanoimaging is a powerful technique for achieving ultrahigh spatial resolution.
The findings offer new insights into nanoscale light-matter interactions.
The experimental approach has broader implications for advanced optical measurements.