Nano Letters· 2026Q1
Cathodoluminescence Wavefront Retrieval
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- Q1SCImago
- 2026year
Short summary
A reference-free method reconstructs the phase of far-field cathodoluminescence (CL) wavefronts using the Gerchberg–Saxton algorithm, enabling detailed analysis of light-matter interactions at the nanoscale.
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Key points
- Introduced a reference-free phase retrieval method for far-field cathodoluminescence (CL) wavefronts.
- Utilized the Gerchberg–Saxton algorithm with real-space and angular-space CL intensity data.
- Successfully reconstructed phase distributions for nanostructures like planar surfaces, nanospheres, plasmonic crystals, and nanowires.
- Demonstrated the ability to reveal underlying radiation mechanisms from reconstructed phase data.
AI-generated from the title and abstract; the full text is not read.
Abstract
Abstract Free-electron-based nanoscopy enables the study of optical excitations in materials with deep-subwavelength spatial resolution, with cathodoluminescence (CL) being one of the most useful signals. When combined with an optical collection system, CL measurements can access multidimensional information on light; yet the phase of the emitted optical fields has remained largely elusive. Here, we demonstrate a reference-free phase retrieval approach for far-field CL wavefronts using the Gerchberg–Saxton algorithm implemented with real-space and angular-space CL intensity data. Applying this approach to representative nanostructures, including a planar surface, nanosphere, plasmonic crystal, and nanowire, we reconstructed distinct phase distributions that revealed their underlying radiation mechanisms. This reference-free framework offers a robust and flexible route for retrieving the phase of electron beam-excited optical fields without relying on a reference wave, making it readily extendable to a wide range of nanostructures.
The authors' abstract, as published at the source. Nano Letters, 2026 · DOI ↗
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